single chain inosilicates in thin section

 

Check out the video atlas of minerals in thin section introduction page for some background on how these videos were prepared and processed, and for additional useful information on the included table content, the search tab, and other user-adjustable features. There is also an accompanying illustration to assist viewers with determining 2V° values from the BxA or optic axis figures in the “optic figures” videos.

Note: Despite the videos being externally linked, depending on the speed of your internet connection, it could still take a minute or two for the full table to load.

To preview or play a video here at the featured thumbnail scale, click the gray play button (which turns blue when you hover over it). Move the cursor off the video and after a few seconds the play button will be hidden. The video can be paused and restarted by subsequent clicks. With some desktop browsers (for example, newer versions of Safari), a “picture-in-picture” option is available to view the videos at a larger scale; the picture-in-picture can be resized by dragging its corner. On desktop or laptop computers, if you’ve selected a video and prefer to watch it full-screen, a full screen button should be available, but in some browsers the button may be hidden. In the latter case, right-click (PC) or control-click (Mac) and select “open frame in new window (or new tab)” from the menu. You’ll initially get a “Sorry, because of its privacy settings, this video cannot be played here” error message, but you’ll also get access to the blue “view on Vimeo” button, which will lead you to where the video is hosted on Vimeo and where you’ll get a variety of viewing and sharing options. On tablets and phones, videos should play in full screen mode by default. On some desktop browsers as well, the thumbnails may also expand to play full screen, for example after a subsequent “play” click of the video.

Both Vimeo- and YouTube-hosted versions of these video are search engine discoverable and can be easily 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.

 


mineral PPL (lower
polar rotation)
PPL
(stage rotation)
XP
(stage rotation)
optic figure
(stage rotation)
enstatite (FKM-23):
enstatite (“hypersthene”; 1.18 Mg apfu) orthopyroxene in granulite facies metapelite, with cordierite, sillimanite and sapphirine
enstatite (FKM-96):
enstatite (“hypersthene”; 1.08 Mg apfu) orthopyroxene in granulite facies meta-tonalite, with olivine, plagioclase, garnet and amphibole
enstatite (FKM-137):
enstatite (“bronzite”) orthopyroxene in “bronzitite” orthopyroxenite, with clinopyroxene
enstatite (FKM-162):
enstatite (1.66 Mg apfu) orthopyroxene in basalt-hosted spinel peridotite xenolith, with forsterite olivine and Cr-bearing diopside clinopyroxene
enstatite (FKM-235):
slightly zoned enstatite (“hypersthene”; ~1.22 Mg apfu) orthopyroxene in basaltic ferro-andesite, with plagioclase feldspar
donpeacorite (FKM-122):
donpeacorite (0.54 VIIIMn2+ apfu) orthopyroxene in Mn-rich pod in granulite facies metasomatized meta-evaporite, with clino-suenoite amphibole and uvite tourmaline
diopside (FKM-1):
diopside (1.00 Mg apfu) clinopyroxene in high grade calc-silicate, with zoisite, graphite, grossular garnet and calcite
diopside (FKM-38):
diopside (0.88 Mg apfu) clinopyroxene in high grade metacarbonate, with calcite
diopside (FKM-41):
zoned diopside clinopyroxene in sövite carbonatite, with pyrochlore, apatite and calcite
diopside (FKM-49):
subsilicic diopside (0.27 IVAl apfu; 0.08 Ti apfu; 0.29 FeT apfu) clinopyroxene in nepheline syenite, with zoned amphibole, apatite and plagioclase feldspar
diopside (FKM-114):
diopside (0.74 Mg apfu) clinopyroxene in olivine melilitite, with forsterite olivine and nepheline
diopside (FKM-148):
zoned diopside (0.86 Mg apfu core; 0.66 Mg apfu rim) clinopyroxene in nephelinite, with forsterite olivine and zoned Ti-rich magnetite-chromite
diopside (FKM-162):
“chrome diopside” (0.69 Mg apfu; 0.02 Cr apfu rim) clinopyroxene in basalt-hosted spinel peridotite xenolith, with forsterite olivine and Cr-bearing spinel
diopside (FKM-218):
mildly zoned diopside clinopyroxene in leucite nephelinite, with forsterite olivine and nepheline
diopside (FKM-261):
Al-bearing (0.11 [IV+VI]Al apfu) diopside clinopyroxene in retrogressed pyrometamorphic metacarbonate, with zeolite+smectite alteration
diopside (FKM-265):
diopside (0.79 to 0.91 Mg apfu; 0.01 to 0.09 Na apfu) clinopyroxene in alkaline ultramafic intrusive, with calcite and magnesio-hastingsite
“jeffersonite” (FKM-303):
diopside/johannsenite/petedunnite (0.41 to 0.48 Mg apfu; 0.35 to 0.46 0.29 Mn2+ apfu; ~0.12 Zn apfu) mixed clinopyroxene in high-grade Mn-Zn metasomatite, with bustamite and hardystonite
hedenbergite (FKM-97):
hedenbergite (0.56 FeT apfu) clinopyroxene in eclogite facies Fe-rich meta-garnetite, with andradite garnet
johannsenite (FKM-143):
johannsenite in Mn-bearing skarn, with quartz and calcite
augite (FKM-230):
Mn-bearing augite (0.41 Mn2+ apfu) clinopyroxene in high grade meta-Mn-metasomatite, with spessartine garnet
aegirine-augite (FKM-249):
aegirine-augite clinopyroxene in miaskitic nepheline syenite, with ferri-katophorite amphibole, biotite, alkali feldspar and nepheline
omphacite/aegirine-augite
(FKM-315): zoned omphacite/aegirine-augite (~0.30 M1[Al+Fe3+] apfu; Al≈Fe3+) near-boundary composition clinopyroxene in metamorposed agpaitic syenite, with alkali feldspars (microcline & albite) and hiortdahlite
omphacite (FKM-34):
weakly zoned omphacite clinopyroxene in eclogite facies metabasite, with garnet and quartz
omphacite (FKM-329):
lavender (“violan”) Mn3+-bearing omphacite clinopyroxene in meta-Mn-exhalite, with calcite and minor piemontite
jadeite (FKM-3):
zoned jadeite-aegirine-omphacite near-boundary composition clinopyroxene in blueschist, with glaucophane amphibole and white mica
aegirine (FKM-14):
anomalously v > r dispersion zoned aegirine clinopyroxene in nepheline syenite, with astrophyllite, mesoperthite feldspar and apatite
aegirine (FKM-77):
aegirine clinopyroxene in kakortokite, with albite plagioclase
namansilite (FKM-331):
namansilite clinopyroxene in meta-Mn-exhalite, with calcite and minor quartz
presumably B(-)
but no useful optic figure was found
aegirine (FKM-145):
aegirine clinopyroxene in agpaitic nepheline syenite, with arfvedsonite amphibole and a fine-grained unidentified groundmass
kosmochlor (FKM-84):
kosmochlor (up to 0.77 Cr apfu) clinopyroxene in blueschist facies metamorphosed albitite, with Cr-jadeite clinopyroxene, chlorite, natrolite and eckermannite amphibole (100X)
presumably B(-)
but no useful optic figure was found
carpholite (FKM-81):
carpholite (0.56 Mn2+ apfu; 0.29 Mg apfu; 0.13 Fe2+ apfu) in blueschist facies Mn-rich metapelite, with quartz
wollastonite (FKM-110):
wollastonite in high grade calc-silicate skarn, with garnet and vesuvianite
wollastonite (FKM-271):
wollastonite in pyrometamorphic sanidinite facies phosphatic metacarbonate, with andradite garnet, gehlenite melilite and apatite (note: thin section is slightly thick)
bustamite (FKM-303):
bustamite (1.83 Ca apfu & 0.10 Zn apfu per 4.0 Si apfu) in high-grade Mn-Zn metasomatite, with hardystonite and diopside (“jeffersonite”) clinopyroxene
pectolite (FKM-173):
pectolite in veinlets with quartz in Mn-metasomatite, with surrounding aluminosugilite/sugilite ss and fine-grained intergrown amphibole+aegirine.
serandite (FKM-60):
serandite in late pegmatite in agpaitic syenite, with ussingite and aegirine clinopyroxene
rhodonite (FKM-230):
rhodonite (0.80 Ca apfu & 0.25 Fe2+ apfu per 5.0 Si apfu) in high grade meta-Mn-metasomatite, with spessartine garnet, Mn-bearing augite clinopyroxene and quartz
vittinkiite (FKM-234):
vittinkiite (~0.40 Ca apfu per 5.0 Si apfu) in high grade meta-Mn-metasomatite
gageite (FKM-20):
gageite in high grade calcareous Zn-Mn metasomatite, with calcite, zincite and tephroite
presumably B(-)
but too fine-grained to obtain a useful optic figure
pyroxmangite (FKM-94):
Fe-bearing pyroxmangite (2.61 Fe2+ apfu per 7.0 Si apfu) in granulite facies metasomatized-Mn-Zn-Pb exhalite, with clino-ferro-suenoite (formerly “manganogrunerite”) amphibole and Fe-bearing spessartine garnet
pyroxmangite (FKM-190): pyroxmangite (~2.1 Fe2+ apfu per 7.0 Si apfu) in high grade meta-Mn-metasomatite, with rhodochrosite, quartz and pyrosmalite-(Mn)
pyroxmangite (FKM-195):
pyroxmangite in high grade meta-Mn-metasomatite, with quartz

non-silicates in thin section

nesosilicates in thin section

sorosilicates and cyclosilicates in thin section

double chain and more complex inosilicates in thin section

phyllosilicates in thin section

tectosilicates and miscellaneous silicates in thin section