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mineral | PPL (lower polar rotation) |
PPL (stage rotation) |
XP (stage rotation) |
optic figure (stage rotation) |
---|---|---|---|---|
quartz (FKM-15): quartz in blueschist facies ferruginous meta-quartzite, with spessartine garnet |
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sanidine (FKM-80): sanidine (K-feldspar) in haüyne phonolite, with aegirine clinopyroxene |
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orthoclase (FKM-78): orthoclase micro-mesoperthite in high grade low-silica feldspathic gneiss, with biotite |
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microcline (FKM-74): microcline K-feldspar in carbonatite-associated K-metasomatite, with diopside clinopyroxene, zoned amphibole and apatite |
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microcline (FKM-315): microcline in metamorposed agpaitic syenite, with omphacite/aegirine-augite clinopyroxene and mosandrite-(Ce) |
old video with especially distracting stray polarization effects scheduled to be replaced | |||
anorthite (FKM-24): anorthite (An95) plagioclase feldspar in high grade amphibolite, with tschermakite amphibole |
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reedmergnerite (FKM-52): reedmergnerite feldspar in highly fractionated alkali granite, with quartz |
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nepheline (FKM-77): anomalously slightly biaxial nepheline in kakortokite, with albite plagioclase and eudialyte |
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nepheline (FKM-120): nepheline in miaskitic nepheline syenite, with alkali feldspar, cancrinite and calcite |
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nepheline (FKM-146): anomalously slightly biaxial nepheline in agpaitic nepheline syenite (“lakarpite”), with arfvedsonite amphibole and apatite |
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nepheline (FKM-218): nepheline in leucite nephelinite, with diopside clinopyroxene and leucite |
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kalsilite (FKM-271): slightly altered Fe3+-bearing (0.29 to 0.40 Fe3+ apfu per ∑T=4.00) kalsilite in pyrometamorphic sanidinite facies phosphatic metacarbonate, with andradite garnet, gehlenite melilite, wollastonite and apatite (note: thin section is slightly thick) |
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leucite (FKM-218): anomalously biaxial leucite in leucite nephelinite, with diopside clinopyroxene and nepheline |
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nosean (FKM-7): nosean in nosean phonolite |
isotropic | |||
haüyne (FKM-313): haüyne in haüyne tephritic phonolite, with Na-sanidine (K-feldspar), plagioclase and diopside clinopyroxene |
isotropic | |||
lazurite (FKM-25): lazurite in granulite facies calcareous meta-evaporite, with calcite, phlogopite, diopside and nepheline (note: thin section is cut substantially thin) |
isotropic (minor birefringent areas may be admixture with non-isometric polymorphs) | |||
genthelvite (FKM-282): genthelvite in granite, with albite, orthoclase and biotite |
isotropic | |||
cancrinite (FKM-120): camcrinite in miaskitic nepheline syenite, with plagioclase, nepheline and calcite |
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meionite (FKM-165): meionite (“wernerite”; 1.90 Na apfu; 1.84 Ca apfu) scapolite in crustal “carbonatite”, with calcite and titanite |
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ussingite (FKM-60): ussingite in late pegmatite in agpaitic syenite |
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stilbite (FKM-170): stilbite in zeolite facies altered basalt |
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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