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The Vimeo-hosted versions of these video are also search-engine discoverable, and can be found by searching for the term “thin section” coupled with the sample number (e.g. “thin section FKM-49”), with or without also including the accompanying mineral name. YouTube-hosted versions of these videos are no longer search-engine discoverable (in protest of YouTube polluting even short educational videos with non-optional ads… grrr!), but can still be found organized in playlists on my rockPTX YouTube channel.
mineral | PPL (lower polar rotation) |
PPL (stage rotation) |
XP (stage rotation) |
optic figure (stage rotation) |
---|---|---|---|---|
phenakite (FKM-288): phenakite in granite pegmatite-associated Be-F metasomatite, with beryl and biotite mica |
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willemite (FKM-48): [Mn-Mg]-bearing willemite (0.15 Mn2+ apfu; 0.14 Mg apfu) in high-grade calcareous Zn-Mn-metasomatite, with gahnite and franklinite |
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forsterite (FKM-112): forsterite (1.89 Mg apfu) olivine in high-grade metasomatized dolomitic marble, with calcite, clinohumite and spinel |
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forsterite (FKM-113): forsterite olivine in nephelinite, with nepheline |
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forsterite (FKM-114): zoned forsterite (1.34 to 1.62 Mg apfu) olivine in olivine melilitite, with melilite, diopside clinopyroxene and nepheline |
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forsterite (FKM-148): zoned forsterite (1.79 Mg apfu core; 1.09 Mg apfu rim) olivine in nephelinite, with diopside clinopyroxene and zoned Ti-rich magnetite-chromite |
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forsterite (FKM-162): forsterite (1.77 Mg apfu) olivine in basalt-hosted spinel peridotite xenolith, with enstatite orthopyroxene, Cr-bearing spinel and Cr-bearing diopside clinopyroxene |
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forsterite (FKM-356): forsterite olivine in high grade magnesian marble, with calcite |
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liebenbergite-forsterite ss (FKM-392): zoned Mg-rich liebenbergite to Ni-rich forsterite olivine in historic anthropogenic slag, with trevorite-dominant spinel (opaque) |
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tephroite (FKM-43): tephroite (1.47 Mn2+ apfu) olivine in high-grade calcareous Mn metasomatite, with calcite |
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monticellite (FKM-10): monticellite (0.90 Mg apfu) olivine in high-grade skarn, with calcite |
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monticellite (FKM-298): monticellite in sövite carbonatite, with calcite, fluorapatite and diopside clinopyroxene |
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monticellite (FKM-404): monticellite in sövite carbonatite, with calcite and apatite |
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pyrope (FKM-266): pyrope (1.96 Mg apfu) garnet in hydrated garnet peridotite, with magnesio-hornblende and diopside |
isotropic | |||
almandine (FKM-23): almandine (1.51 Fe2+ apfu; near pyrope composition boundary) garnet in granulite facies metapelite, with biotite mica, rutile, quartz, sapphirine, and sillimanite |
isotropic | |||
spessartine (FKM-94): Fe-bearing spessartine (0.95 Fe2+ apfu) garnet in granulite facies metasomatized-Mn-Zn-Pb exhalite, with clino-ferro-suenoite (formerly “manganogrunerite”) amphibole and minor Fe-bearing pyroxmangite |
isotropic | |||
grossular (FKM-1): V-bearing (0.10 V apfu) grossular garnet (“tsavorite”) in high-grade calc-silicate, with zoisite, diopside clinopyroxene, titanite and calcite |
isotropic | |||
andradite (FKM-271): Ti-bearing (0.53 to 0.68 Ti apfu) orange andradite garnet (heavily included with flamite) in pyrometamorphic sanidinite facies phosphatic metacarbonate, with melilite, apatite and kalsilite (note: thin section is slightly thick) |
isotropic | |||
andradite (FKM-303): minor-element-enriched andradite garnet (0.59 Mn2+ apfu; 0.01 As5+ apfu; 0.01 Zn apfu) in high-grade Zn-Mn-metasomatite, with bustamite, hardystonite, diopside (“jeffersonite”) clinopyroxene and willemite |
isotropic | |||
uvarovite (FKM-149): anomalously B(-) sector-zoned uvarovite (~1.16 Cr apfu) garnet in altered chromatite, with calcite and magnesiochromite |
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goldmanite (FKM-92): Cr-bearing goldmanite (1.49 V3+ apfu; 0.17 to 0.28 Cr3+ apfu; 0.03 Y apfu) garnet in calcareous meta-U-V-metasomatite, with quartz, calcite and minor tremolite amphibole (note: low relief half of sample is epoxy) |
isotropic | |||
kerimasite (FKM-404): kerimasite garnet (1.34 VIZr apfu; IVFe3+:IVAl apfu ratio ≈ 1.00:0.90) in sövite carbonatite, with perovskite, fluorapatite and calcite |
isotropic | |||
zircon (FKM-35): zircon in nepheline-sodalite syenite, with sodalite, alkali feldspar, and aegirine clinopyroxene |
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zircon (FKM-305): zircon in alkali feldspar microsyenite, with ferro-fluoro-katophorite amphibole, chevkinite-(Ce), fluorcalciopyrochlore, and Na-sanidine (K-feldspar) |
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sillimanite (FKM-23): sillimanite in granulite facies metapelite, with hypersthene orthopyroxene, sapphirine and cordierite |
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sillimanite (FKM-116): sillimanite in granulite facies metapelite, with biotite mica, quartz and garnet |
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sillimanite (FKM-232): coarse sillimanite in granulite facies high-alumina metapelite, with corundum, microcline feldspar, rutile, biotite mica and quartz |
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andalusite (FKM-91): B(+) pleochroic green Mn-bearing (0.15 Mn3+ apfu) andalusite (“viridine”) in mica schist, with quartz and muscovite |
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andalusite (FKM-163): andalusite in a meta-“advanced argillic” metasomatite, with kyanite, muscovite and quartz |
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andalusite (FKM-328): B(+) pleochroic yellow-green [Mn+Fe]-bearing andalusite (“viridine”; 0.06 VIMn3+ apfu & 0.05 VIFe3+ apfu) in Mn-rich metapelite, with quartz, plagioclase and mica |
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kanonaite/Mn-rich andalusite (FKM-336): zoned kanonaite rims (0.73 VIMn3+ apfu) on Mn-rich andalusite cores (0.27 VIMn3+ apfu) in Mn-rich metapelite, with muscovite |
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kyanite (FKM-75): kyanite in amphibolite facies meta-ferrolite, with quartz, Co-bearing staurolite and magnetite |
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kyanite (FKM-163): kyanite in a meta-“advanced argillic” metasomatite, with andalusite, muscovite and quartz |
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kyanite (FKM-214): kyanite in meta-advanced-argillite, with quartz |
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kyanite (FKM-273): kyanite in a phosphate-rich meta-“advanced argillic” metasomatite |
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staurolite (FKM-32a): Cr-bearing (0.14 Cr apfu) staurolite in amphibolite facies metapelite, with quartz and kyanite |
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staurolite (FKM-75): anomalous blue Co-rich (0.38 Co apfu) staurolite (“lusakite”) in amphibolite facies meta-ferrolite, with quartz, kyanite and magnetite |
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yoderite (FKM-69b): yoderite in eclogite facies whiteschist, with kyanite, quartz and talc |
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yoderite (FKM-307): “green” yoderite in eclogite facies whiteschist, with anthophyllite amphibole, talc, hematite and rutile |
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yoderite (FKM-375): yoderite in high grade whiteschist-associated amphibole schist, with amphibole, quartz and kyanite |
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“hydroxylhumite” (FKM-426): “hydroxylhumite” (humite group) in high-grade metasomatic metacarbonate, with dolomite |
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chondrodite (FKM-36): chondrodite (humite group) in high-grade metasomatic metacarbonate, with phlogopite mica and calcite |
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chondrodite (FKM-403): norbergite (humite group) in magnesian marble, with norbergite and calcite |
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alleghanyite (FKM-243): alleghanyite (humite group) in amphibolite facies calcareous meta-Mn-metasomatite, with kutnohorite, kellyite serpentine and galaxite spinel (note: thin section is cut somewhat thin) |
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clinohumite (FKM-112): zoned clinohumite to hydroxylclinohumite (~8.55 Mg apfu; 1.18 to 0.62 F apfu; humite group) in high-grade metasomatized dolomitic marble, with calcite, forsterite olivine, spinel and phlogopite mica |
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clinohumite (FKM-184): clinohumite (8.43 Mg apfu; 1.10 F apfu; humite group) in granulite facies B-bearing meta-carbonate, with calcite/dolomite (note: thin section is cut substantially thin) |
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clinohumite (FKM-364): clinohumite in carbonatite-associated phlogopite metasomatite, with phlogopite |
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hydroxylclinohumite (FKM-356): hydroxylclinohumite in high-grade magnesian marble, with spinel and calcite |
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chloritoid (FKM-142): chloritoid in greenschist facies metapelite, with quartz and fine-grained phyllosilicates |
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titanite (FKM-2): Sb-bearing (0.12 Sb apfu) titanite in meta-Mn-exhalite, with piemontite (epidote group) and quartz |
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titanite (FKM-165): titanite in crustal “carbonatite”, with calcite, diopside clinopyroxene, apatite and phlogopite mica |
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ellenbergerite (FKM-258): Zr-bearing ellenbergerite (Zr>Ti in weakly-colored areas; Ti>Zr in strongly-colored areas) in eclogite facies whiteschist, with pyrope garnet and talc |
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grandidierite (FKM-108): grandidierite in high-grade B-bearing magnesian marble, with phlogopite mica |
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dumortierite (FKM-82): dumortierite in peraluminous granite, with quartz and fibrous sillimanite |
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dumortierite (FKM-327): dumortierite in B-bearing meta-advanced-argillic metasomatite, with quartz, muscovite and tourmaline |
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datolite (FKM-386): datolite in B-bearing skarn, with Mn-rich ferrobustamite and hedenbergite pyroxene |
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gadolinite-(Ce) (FKM-370): gadolinite-(Ce) in REE-metasomatite, with primarily “ferridiassakisite-(Ce)”-dollaseite-(Ce) ss |
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fluorbritholite-(Ce) (FKM-370): fluorbritholite-(Ce) in REE-metasomatite, with “ferridiassakisite-(Ce)”-dollaseite-(Ce) ss, västmanlandite-(Ce) and gadolinite-(Ce) |
no optic figure of useful quality was obtainable | |||
spurrite (FKM-183): spurrite in high-grade B-bearing meta-carbonate, with hillebrandite(?) |
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ternesite (FKM-435): ternesite (polycrystalline pseudomorph after gypsum?) in pyrometamorphic sanidinite facies phosphatic metacarbonate, with primarily larnite, ye’elimite, spinel. Ancillary stage rotation PPL and XP videos at 500X |
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sorosilicates and cyclosilicates in thin section
single chain inosilicates in thin section
double chain and more complex inosilicates in thin section
phyllosilicates in thin section
tectosilicates and miscellaneous silicates in thin section