samples FKM-51 to FKM-75

 

Check out the thin section scans introduction page for more information on the variety of samples featured here, how the scans were taken & processed for web display, and what additional optical and analytical data I hope to include in the figure captions as I continue to update the site and add to the collection of thin sections.

There’s also a fully searchable index covering the complete thin section set, listing for each sample its locality, the anticipated major minerals, a brief generalized geologic environment description, and where appropriate, the nature of any unusual element enrichments.

Note: Depending on the speed of your internet connection, it could take a minute or two for the images to load.

 


sample: FKM-51
locality: Lovozero massif, Kola Peninsula, Murmanskaja Oblast’, Russia.
rock type: test.
major mineralogy: specimen acquired for lorenzenite.
(left: unpolarized light; right: under crossed polars)

 



sample: FKM-52
locality: Darai-Pioz glacier, Alai range, Tien Shan Mtns., Tajikistan.
rock type: highly-evolved B-rich alkali granite.
major mineralogy: Almost entirely coarse reedmergnerite, intermixed with veinlet-like fine-grained quartz and very minor lepidolite. Sparse stillwellite-(Ce) adjacent to a chain of sparse purple manganoeudialyte(?), the latter with a tiny inclusion of sazykinaite-(Y) adjacent to a tiny inclusion of zeravshanite.
(left: unpolarized light; right: under crossed polars)

 



sample: FKM-53 (billet courtesy of M. Origlieri, Univ. Arizona; separate specimen from sample FKM-53b)
locality: Madrelena mine, Tres Pozos, Baja California Norte, Mexico.
rock type: test.
major mineralogy: specimen acquired for gillespite. Also contains sanbornite, titantaramellite, quartz, bazirite, cherchiaraite-(Fe), alforsite, and at least one additional unidentified Ba-Ti-Si-Cl mineral.
(left: unpolarized light; right: under crossed polars)

 



sample: FKM-53b (separate specimen from sample FKM-53)
locality: Madrelena mine, Tres Pozos, Baja California Norte, Mexico.
rock type: test.
major mineralogy: specimen acquired for gillespite.
(left: unpolarized light; right: under crossed polars)

 



sample: FKM-54
locality: Franklin mining district, Sussex Co., NJ, USA.
rock type: test.
major mineralogy: rhodonite, andradite, franklinite, cpx (“jeffersonite”).
(left: unpolarized light; right: under crossed polars)

 



sample: FKM-55 (billet from Univ. Arizona economic geology collection; sample 96-15a).
locality: Oka complex, Oka, Laurentides, Québec, Canada.
rock type: carbonatite (sovite).
major mineralogy: calcite, pyrochlore, phologopite, diopside, apatite. This sample is similar to FKM-41, also from Oka, but is poorer in silicates and pyrochlore.
(left: unpolarized light; right: under crossed polars)

 



sample: FKM-56 (billet from Univ. Arizona economic geology collection; sample 96-13)
locality: Oka complex, Oka, Laurentides, Québec, Canada.
rock type: “okaite”. Intrusive equivalent of haüyne melilitite.
major mineralogy: Haüyne, melilite, britholite.
(left: unpolarized light; right: under crossed polars)

 



sample: FKM-57 (billet from Univ. Arizona economic geology collection; sample 96-6)
locality: Oka complex, Oka, Laurentides, Québec, Canada.
rock type: carbonatite (sovite).
major mineralogy: Niocalite.
(left: unpolarized light; right: under crossed polars)

 



sample: FKM-58
locality: Meldon mine, Okehampton, Devon, England, UK.
rock type: test.
major mineralogy: Malayaite.
(left: unpolarized light; right: under crossed polars)

 



sample: FKM-59
locality: Waldheim, Döbeln, Saxony, Germany.
rock type: granulite.
major mineralogy: Prismatine, dravite. For comparison, other prismatine-bearing (and kornerupine-bearing) samples featured here include FKM-46 and FKM-67.
(left: unpolarized light; right: under crossed polars)

 



sample: FKM-60
locality: Umbozero mine, Alluaiv Mtn., Lovozero massif, Kola Peninsula, Murmanskaja Oblast’, Russia.
rock type: test.
major mineralogy: Ussingite, sérandite.
(left: unpolarized light; right: under crossed polars)

 



sample: FKM-61
locality: Canta province, Lima Department, Peru.
rock type: test. Compare this sample to the similar boron-bearing advanced argillic alteration assemblage in samples FKM-70 and FKM-187.
major mineralogy: Dumortierite.
(left: unpolarized light; right: under crossed polars)

 



sample: FKM-62
locality: Khibiny massif, Kola Peninsula, Murmanskaja Oblast’, Russia.
rock type: test.
major mineralogy: specimen acquired for eudialyte.
(left: unpolarized light; right: under crossed polars)

 



sample: FKM-63
locality: Mahenge, Morogoro region, Tanzania.
rock type: high grade spinel-bearing marble.
major mineralogy: Spinel (in the hand sample, but not in this thin section), along with pargasite, phlogopite and minor Cl-bearing fluorapatite, in a calcite + dolomite marble.
(left: unpolarized light; right: under crossed polars)

mineral representative mineral compositions in FKM-63
fluorapatite (most Cl-rich) Ca4.99[P3.01O12](F0.61[OH]0.24Cl0.15)
pargasite (Na0.60K0.12Ca0.040.24)Ca2.00(Mg4.02Al0.77Ti0.14Fe3+0.04V0.02)[Si6.09Al1.91O22]([OH]1.27F0.42O0.29Cl0.02)
phlogopite (K0.90Na0.05Ba0.010.04)(Mg2.82Al0.14FeT0.01Ti0.010.02)[Si2.90Al1.10O10]([OH]1.58F0.39O0.02Cl0.01)
clinochlore (Mg4.58Al1.29FeT0.03Ti0.010.09)[Si2.88Al1.12O10]([OH]7.90F0.09O0.01)

 



sample: FKM-64
locality: Kipawa alkaline complex, Les Lacs-du-Témiscamingue, Abitibi-Témiscamingue, Québec, Canada.
rock type: metamorphosed alkali syenite.
major mineralogy: Miserite, agrellite (with rims of REE-bearing pectolite).
(left: unpolarized light; right: under crossed polars)

 



sample: FKM-65
locality: Kipawa alkaline complex, Les Lacs-du-Témiscamingue, Abitibi-Témiscamingue, Québec, Canada.
rock type: metamorphosed alkali syenite.
major mineralogy: Mosandrite, eudialyte, fluoro-richterite, microcline. Sample FKM-27, also from the Kipawa complex, is similar to this sample but lacks any significant mosandrite.
(left: unpolarized light; right: under crossed polars)

 



sample: FKM-66
locality: Cerro Sapo, Ayopaya province, Cochabamba Department, Bolivia.
rock type: ankerite-sodalite carbonatite.
major mineralogy: Primarily massive sodalite with abundant coarse subhedral crystals of a dolomite-group carbonate. The cores of the carbonate are a vuggy (former solid or fluid inclusions?) Fe-rich dolomite grading outwards to a clean Mg-rich ankerite. The sodalite is locally altered to small patches of analcime. The 2nd order blue birefringence mica-like blade in the NE corner of the XP image was on first inspection thought to be phlogopite, but was subsequently found to be B(-) with a 2V° ≈ 80°; this material was verified by EPMA to be the Na-Al-carbonate dawsonite (for elements z ≥ 9, only Na and Al were present, but a good quantitative analysis was not possible due to the mineral’s extreme instability under the electron beam, even using a 10 μm defocused beam and slow raster). Note that dawsonite’s actual maximum birefringence is δ = 0.130 (so ~7th to ~8th order!), but this grain is fortuitously oriented to give an almost perfectly centered optic axis figure. The main dawsonite mass encloses small blades of orthoclase (these are also sparsely scattered elsewhere in the sample), as well as a zeolite that appears to be a Sr-dominant end-member of edingtonite (based on the Al:Si ratio and estimated H2O content). Small but abundant grains of REE-rich burbankite, Th-rich ancylite-(Ce) and Ca-rich strontianite are widely scattered within the sample, and in some cases are intergrown together. EPMA analyses of both REE-bearing carbonates gave high totals (~106 wt%) but acceptable stoichiometries and charge balances. A single small mass of REE-bearing goyazite was also observed.
(left: unpolarized light; right: under crossed polars)

mineral representative mineral compositions in FKM-66
dolomite-rich dolomite group ss
(vuggy interior)
(Ca0.97Mn2+0.03)(Mg0.64Fe2+0.34Mn2+0.02)[CO3]2
ankerite-rich dolomite group ss
(clean exterior)
(Ca0.98Na0.01Mn2+0.01)(Fe2+0.60Mg0.37Mn2+0.04)[CO3]2
strontianite (Sr0.77Ca0.17Ba0.02Ce0.01La0.01Na0.01)[(CO3)0.99(CO3F)0.01]
burbankite (Na2.27Ca0.66Sr0.07)(Sr2.20Ce0.26La0.15Ba0.12Nd0.10Th0.08Pr0.03Sm0.03Gd0.03)
[(CO3)4.96(CO3F)0.04]
ancylite-(Ce) (Ce0.37La0.19Th0.18Nd0.13Pr0.04Sm0.03Gd0.02Ba0.01Sr0.03)(Sr0.84Ca0.17)
[CO3]2([OH]0.90F0.10) . ~1H2O
goyazite (Sr0.58Ba0.28Ca0.10Ce0.02La0.01Nd0.01Na0.01)(Al2.99Fe3+0.01)
[P0.99Si0.01O3.02(OH)0.98][P1.00O4]([OH]5.91F0.09)
orthoclase (K0.98Na0.02)[Si2.98Al1.02O8]
sodalite Na5.92[Si5.92Al6.08O24] . Na2.01(Cl1.97[CO3]0.02)
“Sr-edingtonite?” (Sr0.38Ca0.29Ba0.22K0.07Na0.07)[Si2.96Al2.04O10] . ~4H2O
analcime Na0.94[Si1.97Al1.03O6] . H2O

 



sample: FKM-67
locality: Plenty River mine area, Harts Range, NT, Australia. This material is ostensibly identical to that found at the classic Mt. Riddock station locality, but it’s unclear if the Plenty River mine area is a distinct occurrence in the Harts Range, or simply an imprecise reference to the Mt. Riddock locality.
rock type: test.
major mineralogy: test. For comparison, other prismatine-bearing (and kornerupine-bearing) samples featured here include FKM-46 and FKM-59.
(left: unpolarized light; right: under crossed polars)

 



sample: FKM-68
locality: Longido area, Mt. Kilimanjaro region, Tanzania.
rock type: corundum-zoisite-pargasite gneiss. Presumably a higher pressure (eclogite facies) equivalent of corundum-bearing amphibolite (i.e., akin to sample FKM-24); estimated at between 700°-850° C and between ~10-20 kbars, according to experimental phase relations. Note that unlike FKM-24, the amphibole in this sample is actually pargasite rather than tschermakite.
major mineralogy: Porphyroblasts of pale red Cr-bearing corundum (“ruby”) in a matrix of coarse zoisite and pargasite. Inclusions of remnant(?) Cr- and Fe3+-enriched spinel and pumpellyite-(Al) occur, primarily within the zoisite. Minor retrograde alteration (corundum veined by diaspore and chlorite along zoisite-amphibole boundaries) is also present.
(left: unpolarized light; right: under crossed polars)

mineral representative mineral compositions in FKM-68
spinel (Mg0.62Fe2+0.35Mn2+0.01Zn0.01)(Al1.76Cr0.23Fe3+0.01)O4
corundum (Al1.99Cr0.01)O3
diaspore (Al0.99Cr0.01)O(OH)
zoisite Ca1.00(Ca0.98Sr0.02)Al1.01Al1.00(Al0.94Fe3+0.05Cr0.01)O[Si1.97Al0.03O7][Si0.98Al0.02O4](OH)
pumpellyite-(Al) (Ca1.96Na0.02Fe2+0.01Mn2+0.01)(Al0.63Mg0.32FeT0.05)Al2.00
[Si1.98Al0.02O7][Si0.99Al0.01O4]([OH]~1.36O~0.64) . H2O
pargasite (most Cr-rich) (Na0.52K0.110.37)(Ca1.97Na0.03)(Mg3.23Al1.07Fe3+0.29Fe2+0.26Cr0.11Ti0.02Mn2+0.01Ni0.01)
[Si5.91Al2.08O22]([OH]1.96O0.04)
clinochlore (Ca0.01K0.01)(Mg3.96Al1.23FeT0.54Cr0.09MnT0.01Ni0.010.16)[Si2.81Al1.19O10](OH)8.00

 



sample: FKM-69 (separate specimen from sample FKM-69b)
locality: Mautia Hill, Kongwa, Kongwa district, Dodoma region, Tanzania.
rock type: yoderite-kyanite-talc metaquartzite (“whiteschist”). UHP eclogite facies sepiolitic(?) metapelite with accompanying metasomatism?
major mineralogy: Yoderite overgrowing orange kyanite, in a matrix of talc and dominant quartz. Scattered hematite, with some associated rutile (the 0.04 apfu Mn corresponds to ~25800 ppm Mn; also with ~102 ppm Cr), is also present.
(left: unpolarized light; right: under crossed polars)

mineral representative mineral compositions in FKM-69
rutile (Ti0.94Mn4+?0.04Fe3+0.01)O2
hematite (Fe3+1.90Mn3+0.06Al0.01Ti0.01Mg0.01)O3
kyanite (Al1.97Fe3+0.03)O[Si0.98Al0.02O4]
yoderite (Mg1.90Fe2+0.05Mn2+0.05)(Al5.57Fe3+0.39Mg0.03Ti0.01)O2[Si0.99Al0.01O4]4(OH)2.00
talc Ca0.01(Mg2.75Al0.17FeT0.020.06)[Si3.91Al0.09O10]([OH]1.98F0.02)

 



sample: FKM-69b (separate specimen from sample FKM-69)
locality: Mautia Hill, Kongwa, Kongwa district, Dodoma region, Tanzania.
rock type: yoderite-kyanite-talc metaquartzite (“whiteschist”). UHP eclogite facies sepiolitic(?) metapelite with accompanying metasomatism?
major mineralogy: Yoderite overgrowing orange kyanite, in a matrix of talc and dominant quartz.
(left: unpolarized light; right: under crossed polars)

 



sample: FKM-70
locality: Tsukigata mine, Koriyama, Fukushima Prefecture, Honshu Island, Japan.
rock type: test. Compare this sample to the similar boron-bearing advanced argillic alteration assemblage in sample FKM-61 and FKM-187.
major mineralogy: Dumortierite, foitite.
(left: unpolarized light; right: under crossed polars)

 



sample: FKM-71
locality: Cristalmayu valley area, Alto Chapare district, Chapare province, Cochabamba Department, Bolivia.
rock type: test.
major mineralogy: Abundant large zoned tourmaline ranging from dominant povondraite to alumino-povondraite, with small patches of a new tourmaline (“K-povondraite”). Additional crystals of a notably lower-Fe oxy-dravite are scattered in the matrix of hydromagnesite, K-feldspar, hematite and minor talc. Reported M3+/∑M (where M = Fe+Mn) and O/(O+OH) in the tourmaline analyses are estimations and have not been independently measured. For the povondraite-related tourmalines, values of M3+/∑M between 0.708 and 0.825 normalize to un-named tourmaline end-members inconsistent with their very high Fe contents (i.e. oxygen apfu in the “W” site becomes less than 0.50); for values of M3+/∑M < 0.708, the normalizations fail altogether (oxygen apfu in the “W” site calculates to less than zero). For the oxy-dravite only, values of M3+/∑M < 0.12 normalize to dravite instead of oxy-dravite; although mathematically permissible, this would again seem to be inconsistent with the overall highly-oxidized assemblage present in the sample.
(left: unpolarized light; right: under crossed polars)

mineral representative mineral compositions in FKM-71
oxy-dravite (in matrix) (Na0.91K0.060.06)(Al1.93Mg0.55Fe2+0.49Ti0.03)(Al4.45Mg1.00Fe3+0.55)
[Si5.97Al0.02P0.01O18](BO3)3(OH)3(O0.92F0.08)
alumino-povondraite-rich tourmaline ss (Na0.80K0.20)Fe3+3.00(Al2.24Mg2.13Fe3+1.01Ti0.28Fe2+0.24V0.01)
[Si6.09O18](BO3)3(OH)3O1.00
povondraite-rich tourmaline ss (Na0.64K0.37Ca0.06)Fe3+3.00(Fe3+3.05Mg1.69Fe2+0.58Al0.55Ti0.03V0.01)
[Si6.10O18](BO3)3(OH)3O1.00
“K-povondraite”-rich tourmaline ss (K0.58Na0.45)Fe3+3.00(Fe3+3.82Mg1.82Fe2+0.30Al0.01Ti0.01V0.01)
[Si5.96P0.06O18](BO3)3(OH)3O1.00

 



sample: FKM-72
locality: Schlarbaum quarry, Klause, Bad Gleichenberg, Styria, Austria.
rock type: altered latite.
major mineralogy: Kolbeckite present in the hand sample, but not observed in this thin section; plagioclase phenocrysts in a volcanic matrix.
(left: unpolarized light; right: under crossed polars)

 



sample: FKM-73
locality: Stokkøya, Langesundfjorden, Larvik, Vestfold, Norway.
rock type: nepheline syenite.
major mineralogy: specimen acquired for hiortdahlite.
(left: unpolarized light; right: under crossed polars)

 



sample: FKM-74 (billet from Univ. Arizona economic geology collection; sample PAL-3)
locality: Palabora mine, Loolekop, Phalaborwa, Limpopo province, South Africa.
rock type: “syenite” (may be a “K-fenite” rather than a true igneous syenite) associated with a carbonatite.
major mineralogy: microcline, amphibole (occurs as large minimally-zoned crystals with a composition roughly halfway along the ferri-winchite/potassic-richterite join… this is the earliest amphibole and may represent an igneous amphibole associated with the carbonatite complex emplacement; later thin rims and interior patches on the NaCa-amphibole, as well as being the dominant composition of more finely-crystalline adjacent amphibole aggregates, is a Fe-rich actinolite that appears to be secondary; a seemingly still later “boundary” layer between the main coarse NaCa-amphibole and actinolite aggregates is even more Fe-rich ferro-actinolite; similar but slightly less Fe-rich material also forms scattered rims outside of the actinolite rims and actinolite aggregates), apatite (notably as large crystals in a calcite vein surface, in the hand sample).
(left: unpolarized light; right: under crossed polars)

mineral representative mineral compositions in FKM-74
digenite (Cu8.93Fe0.06)S5.00
bornite (poor stoichiometry;
re-analysis warranted)
Cu5.15Fe1.07S4.00
calcite (main) Ca1.00[CO3]
calcite (patchy highest z) (Ca0.96Sr0.02Fe2+0.01Mg0.01)[CO3]
“hydroxylsynchysite-(Ce)”
(admixed with Ca-REE-Fe-silicate;
see below)
(Ca0.86Mg~0.07K~0.05Sr0.01)(Ce0.51La0.31Nd0.13Pr0.05)[CO3]2([OH]0.65F0.35)
barite (Ba0.97Sr0.02Na0.01)[S1.00O4]
fluorapatite (core; most F-rich) (Ca4.84Sr0.06Ce0.02Na0.02La0.01Nd0.01)[P2.98Si0.02O12](F0.98[OH]0.01)
fluorapatite (rim; most REE+Si-rich) (Ca4.82Sr0.06Ce0.04Na0.03La0.02Nd0.02Y0.01)[P2.93Si0.07O12](F0.85[OH]0.14Cl0.01)
monazite-(Ce) (inclusion in apatite) (Ce0.50La0.31Nd0.10Pr0.04Th0.01Ca0.01)[P1.00Si0.02O4]
titanite (Ca0.96Ce0.01Nd0.01)(Ti0.93Fe3+0.05V0.01Zr0.01)(O0.94F0.03[OH]0.03)[Si0.97Al0.01Fe3+0.01O4]
~midway along the join between
(Ca[REE]2)(Fe3+2Fe2+2)[Si2O7][SiO4]3
and (Ca2[REE])(Fe3+3Fe2+)[Si2O7][SiO4]3
(admixed with “hydroxylsynchysite-(Ce)”)
(Ca1.44Ce0.79La0.41Nd0.17Pr0.07Sr0.06Mn2+0.02Sm0.01)(Fe3+1.73Fe2+1.42Al0.75Mg0.07Ti0.03)
[Si1.98Al0.02O7][Si1.00O4]3
epidote/allanite with compositional variability; analyses pending
~[ferri-winchite]-[potassic-richterite] join-rich
NaCa-/Ca-amph ss (main; most Mg-rich)
(K0.42Na0.06Sr0.010.51)(Ca1.32Na0.67)(Mg3.79Fe2+0.92Fe3+0.26Mn2+0.01Ti0.01)
[Si7.92Al0.08O22]([OH]1.36F0.61O0.03)
actinolite-rich NaCa-/Ca-amph ss
(interior patches & inner rims)
(Na0.03K0.020.95)(Ca1.97Na0.03)(Mg2.80Fe2+2.12Mn2+0.05Fe3+0.03)
[Si7.96Al0.03Fe3+0.01O22]([OH]1.92F0.08)
ferro-actinolite-rich NaCa-/Ca-amph ss
(“boundary” layer & outer rims; most Fe-rich)
(K0.010.99)(Ca1.97Mn2+0.02Na0.01)(Fe2+2.94Mg1.97Mn2+0.08Fe3+0.01)
[Si7.98Fe3+0.01O22](OH)2.00
phlogopite (K0.96Na0.010.03)(Mg2.14FeT0.77Ti0.06MnT0.010.02)
[Si3.02Al0.95Fe3+0.03O10]([OH]1.39F0.48O0.12Cl0.01)
microcline (main) (K0.97Na0.03)[Si2.98Al0.98Fe3+0.04O8]
microcline
(patchy & vuggy; most Na-rich)
(K0.88Na0.13)[Si2.97Al1.03O8]
microcline
(patchy; most Ba-rich)
(K0.91Ba0.05Na0.04)[Si2.92Al1.07Fe3+0.01O8]
microcline
(patchy; most K-rich)
(K0.99Na0.01)[Si2.98Al1.01O8]

 



sample: FKM-75 (billet courtesy of S. Vrána, Czech Geologic Survey)
locality: Chongwe River region (~120 km E. of Lusaka), Zambia.
rock type: staurolite-kyanite-magnetite gneiss. Amphibolite facies “ferrolite” (due to this rock’s unusual bulk composition, its protolith has not been definitively ascertained).
major mineralogy: Abundant blue(!) Co-bearing staurolite (“lusakite”), associated with and sometimes overgrowing abundant kyanite, with minor sillimanite, all hosted by intergrown magnetite, hematite, ilmenite, and quartz. Tiny violet “cobaltohögbomite-2N2S“, a potentially new member of the högbomite family, is abundantly scattered within the oxide. Minor phyllosilicate alteration consists of both margarite and a more abundant cobaltoan clinochlore. The sample is poor in sulfides, with only a few scattered grains of cobalt-pentlandite and linnaeite. Note that the site fillings in the staurolite and “cobaltohögbomite-2N2S” are estimated and have not be verified by crystal structure analyses. Similarly, M3+/∑M ratio and OH content of the staurolite are also estimated, while the polysome of the högbomite species is based off of the reported polysome for cobaltoan ferrohögbomite-2N2S from the same locality (see the mindat.org ferrohögbomite-2N2S entry). Scattered rutile (also with ~196 ppm Co and ~150 ppm Mn) is also present.
(left: unpolarized light; right: under crossed polars)

mineral representative mineral compositions in FKM-75
cobalt-pentlandite (Co7.93Ni0.97Fe0.10)S8
linnaeite (Co2+0.68Ni2+0.32)(Co3+1.97Fe3+0.03)S4
rutile (Ti0.99Fe3+0.01)O2
hematite (Fe3+0.81Fe2+0.14Co0.05)(Fe3+0.79Ti0.19V0.02)O3
ilmenite (Fe2+0.82Co0.06Fe3+0.05Mg0.04Mn2+0.02)(Ti0.95Fe3+0.05)O3
magnetite (Fe2+0.93Co0.06Ni0.01)(Fe3+1.99Al0.01)O4
“cobaltohögbomite-2N2S (Al0.55Fe2+0.44)(Al3.54Ti0.45Ga0.01)O7([OH]0.94F0.06) .
(Co0.88Mg0.72Fe2+0.29Ni0.07Zn0.03Mn2+0.01)(Al3.23Fe3+0.77)O8
sillimanite (Al1.97Fe3+0.02)O[Si0.97Al0.03O4]
kyanite (Al1.99Fe3+0.01)O[Si0.99Al0.01O4]
staurolite 4Al2O[Si0.97Al0.03O4] .
(Al0.84Mg0.10Ti0.05Mn2+0.01)(Fe2+1.08Mg0.51Co0.38Ni0.02Zn0.01)(O2.80[OH]1.16F0.04)
margarite (Ca0.70Na0.280.02)(Al1.97FeT0.06Mg0.05Co0.010.91)[Si2.12Al1.88O10](OH)2.00
clinochlore (Mg3.51Al1.37FeT0.80Co0.19Ni0.050.08)[Si2.62Al1.38O10]([OH]7.98F0.02)

 



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