Muscovite Schist
Muscovite Schist (KAl2(AlSi3O10)(OH)2 matrix)
metamorphic
Category
Sedimentary Or Metamorphic (Base Substrate)
Browse sedimentary or metamorphic (base substrate) specimens identified by the Rock Identifier community.
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Native Silver Nugget
Silver (Ag)
mineral
Tumbled hematite (likely hematite-rich ironstone)
Hematite, Fe₂O₃; possibly mixed with magnetite or goethite
mineral
Gneiss
Gneiss
metamorphic
Pyrite-bearing rock (likely pyrite in a quartz-rich matrix)
Pyrite (FeS₂), with a light-colored quartz-rich host; exact host rock is unclear from the image
mineral
Iolite-bearing Gneiss (Cordierite)
Cordierite (Mg2Al4Si5O18) in Gneiss matrix
metamorphic
Mica Schist
Mica Schist (primarily Muscovite or Biotite-rich sequence)
metamorphic
Muscovite-rich schist (mica schist)
Mica schist, composed chiefly of muscovite (KAl₂(AlSi₃O₁₀)(OH)₂), with possible quartz and feldspar
metamorphic
Biotite Schist
Biotite Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)
metamorphic
Muscovite Schist with Quartz
Mica Schist (KAl2(AlSi3O10)(OH)2 with SiO2)
metamorphic
Red Jasper
Jasper (Silicon Dioxide Si₂O₃)
sedimentary
Mica-rich rock, possibly mica schist
Mica schist (likely muscovite- and/or biotite-rich; identification uncertain from the image)
metamorphic
Mica Schist
Mica Schist (Composition: Muscovite, Biotite, Quartz, Feldspar)
metamorphic
Epidote with Quartz
Ca2(Al,Fe)3(SiO4)3(OH) (Epidote) / SiO2 (Quartz)
mineral
Gneiss
Gneiss (high-grade metamorphic rock typically composed of quartz, feldspar, and mica)
metamorphic
Gneiss (Pebble)
Gneiss
metamorphic
Quartz (Milky/Smoky variety on matrix)
Silicon Dioxide (SiO2)
mineral
Natural freshwater pearls
Pearl (nacreous calcium carbonate; chiefly aragonite, CaCO₃)
gemstone
Feldspar-rich Quartzite
Metamorphic Quartz-Feldspar Aggregate (SiO2 + KAlSi3O8)
metamorphic
Mica Schist with Quartz
Mica Schist (principally Muscovite and Biotite with Quartz veins)
metamorphic
Mica-rich schist (tentative)
Mica schist, likely muscovite–biotite schist; exact minerals cannot be confirmed from the image
metamorphic
Epidote
Epidote; Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
mineral
Muscovite
KAl2(AlSi3O10)(OH)2
mineral
Blue Kyanite
Kyanite (Al2SiO5)
mineral
River Stones (Quartzite and Sandstone)
Quartzite / Sedimentary Rock (SiO2 dominant)
sedimentary
Quartz Mica Schist
Mica-Quartz Schist (Chemical: SiO2 + KAl2(AlSi3O10)(OH)2)
metamorphic
Banded Gneiss
Banded Gneiss (High-grade Metamorphic Rock)
metamorphic
Dragon Blood Jasper
Epidote and Pietersite-rich Quartz (SiO2 with inclusions)
sedimentary
Mica Schist with Garnet inclusions
Mica Schist (primarily Muscovite and Biotite - KAl2(AlSi3O10)(OH)2)
metamorphic
Polished Black Basalt Pebble
Basalt
igneous
Rounded gray river pebble, likely basalt or andesite
Fine-grained mafic to intermediate volcanic rock; exact identification requires testing
igneous
Mica Schist with Quartz
Mica Schist (primarily Muscovite or Biotite with Quartz)
metamorphic
Mica Schist
Muscovite Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Garnet-Mica Schist
Garnetiferous Porphyroblastic Schist
metamorphic
Green Slate Pebble (Serpentine / Greenschist Pebble)
Greenschist / Low-grade Metamorphic Rock
metamorphic
Dyed mineral cluster, likely calcite or aragonite
Calcite (CaCO₃) or aragonite (CaCO₃), artificially color-enhanced
mineral
Milky Quartz with Iron Inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Anthracite Coal
Anthracite (Carbon-based organic sedimentary rock transitioned to metamorphic)
metamorphic
Quartz / Quartzite
Silicon Dioxide (SiO2)
metamorphic
Mica Schist
Mica Schist (primarily Muscovite and Biotite)
metamorphic
Gneiss (Hornblende/Biotite Gneiss)
Foliated Metamorphic Rock (Quartz-Feldspar-Amphibole/Mica matrix)
metamorphic
Schist
Mica Schist (Metamorphic rock)
metamorphic