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Polarized Light Microscopy
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Petrographic Atlas
- Andalusite
- Amphibole
- Calcite
- Chlorite
- Cordierite
- Epidote
- Feldspar
- Feldspathoid
- Garnet
- Kyanite
- Lawsonite
Thin section videos
Porphyritic alkali basalt
Plagioclase, augite and olivine phenocrysts in a vesicular basalt.
Porphyritic alkali basalt
Hourglass structure in a titanian augite phenocryst.
Leucite-nepheline basanite, Nyiragongo
Basanite enriched in foidic minerals reasulting from the flotation of leucite and nepheline in an undersaturated lava from Nyiragongo.
Leucite-nepheline basanite, Nyiragongo
Basanite enriched in foidic minerals reasulting from the flotation of leucite and nepheline in an undersaturated lava from Nyiragongo.
Leucite-nepheline aggregate, Nyiragongo
Andesite, Oligocene, Provence
Plagioclase phenocrysts, hornblende and diopside in a microcrystalline to hyaline groundmass with microcrysts of plagioclase, diopside and oxides (magnetite-imenite).
Andesite, Oligocene, Provence
Plagioclase phenocrysts, hornblende and diopside in a microcrystalline to hyaline groundmass with microcrysts of plagioclase, diopside and oxides (magnetite-imenite).
Andesite, Oligocene, Provence
Plagioclase phenocrysts, hornblende and diopside in a microcrystalline to hyaline groundmass with microcrysts of plagioclase, diopside and oxides (magnetite-imenite).
Andesite, Oligocene, Provence
Plagioclase phenocrysts, hornblende and diopside in a microcrystalline to hyaline groundmass with microcrysts of plagioclase, diopside and oxides (magnetite-imenite).
Syenite, Oligocene, Alps
Syenite, Oligocene, Alps
Syenite, Oligocene, Alps
Syenite, Oligocene, Alps
Two-mica granite
Two-mica granite
Hornblende granite
Hornblende granite
Microcline
Glaucophanite
Glaucophanite
Glaucophanite
Staurolite mica schist
Staurolite porphyroblasts in a matrix of muscovite, biotite, quartz and feldspar.
Staurolite mica schist
Staurolite porphyroblasts in a matrix of muscovite, biotite, quartz and feldspar.
Staurolite mica schist
Staurolite porphyroblasts in a matrix of muscovite, biotite, quartz and feldspar.
Sillimanite mica schist
Aggregate of fibrous sillimanite (fibrolites) in a quartz and biotite matrix.
Needlelike crystals of sillimanite
Sillimanite fibrolites (fibrous crystals).
Eclogite
Eclogite
kyanite–garnet gneiss
Kyanite and garnet porphyroblasts in a granoblastic matrix of biotite, quartz and feldspar.
kyanite–garnet gneiss
Kyanite and garnet porphyroblasts in a granoblastic matrix of biotite, quartz and feldspar.
Andalusite hornfels
Andalusite crystals with graphite inclusions (chiastolite) in a fine matrix of biotite, quartz and graphite.
Andalusite hornfels
Andalusite crystals with graphite inclusions (chiastolite) in a fine matrix of biotite, quartz and graphite.
Spinel lherzolite
Lherzolite with equigranular texture and olivine – diopside - enstatite – spinel assemblage.
Spinel lherzolite
Lherzolite with equigranular texture and olivine – diopside - enstatite – spinel assemblage.
Spinel lherzolite
Lherzolite with equigranular texture and olivine – diopside - enstatite – spinel assemblage.
Granophyre xenolith, Krafla, Iceland
Graphic intergrowth of quartz and alkali feldspar.
Haüyne phonolite, Mont Dore, French Massif Central
Contacts
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