Mica Schist
Mica Schist (Predominantly Muscovite/Biotite)
metamorphic
Category
Mineral Based Alloy (Anthropogenic)
Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.
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Chert (Jasper or Flint variant)
Chert (composed of microcrystalline quartz, SiO2)
sedimentary
Snowflake Obsidian
Hydrated Volcanic Glass with Cristobalite inclusions
igneous
Basalt (Vesicular)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Basalt
Mafic volcanic rock (various silicate minerals including Pyroxene and Plagioclase)
igneous
Basalt
Basalt (principally Plagioclase Feldspar and Pyroxene)
igneous
Granite (with Quartz and Mica)
Phaneritic Felsic Igneous Rock
igneous
Pearl (nacre)
Calcium Carbonate (mostly CaCO3 as Aragonite) and Conchiolin
Organic Mineraloid
Muscovite Schist
KAl2(AlSi3O10)(OH)2 (Muscovite) in Schist Matrix
metamorphic
Jasper with Quartz Veining
Silicon Dioxide (SiO2) with impurities
sedimentary
Quartzite
Quartzite (primarily composed of SiO O₂)
Sedimentary Rock
Sandstone (Quartzose type)
Arenite (primarily SiO2)
sedimentary
Garnet-Bearing Gneiss
Almandine-Garnet Gneiss
metamorphic
Siltstone
Siltstone (primarily composed of silica and clay minerals)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Granite (River Cobble)
Granite (rich in feldspar, quartz, and biotite)
igneous
Zoisite with Ruby
Anyolite (Calcium aluminum hydroxy silicate with Corundum) Ca2Al3(SiO4)3(OH)
metamorphic
Diorite
Phaneritic Intermediate Igneous Rock
igneous
Granite (Alkali-feldspar rich)
Phaneritic Felsic Igneous Rock (Major components: KAlSi3O8, SiO2)
igneous
Basalt with Iron Oxidation
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Basalt with Vesicles
Vesicular Basalt (comprising Plagioclase Feldspar, Pyroxene, and Olivine)
igneous
Pink Granite
Felsic Plutonic Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)
Igneous
Mica (likely Muscovite)
Muscovite / KAl2(AlSi3O10)(OH)2
mineral
Granite
Granite
igneous
Granite
Phaneritic plutonic rock (Quartz, Alkali Feldspar, and Plagioclase)
igneous
Muscovite Schist
Muscovite Mica Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Schist
Mica Schist (primarily Muscovite and Quartz)
metamorphic
Mica-rich Sandstone or Micaceous Schist Weathering
Micaceous Schist (Muscovite-Quartz composition)
Metamorphic or Sedimentary depending on local grade
Mica Schist
Mica Schist (Main mineral constituents: Muscovite/Biotite, Quartz, Feldspar)
metamorphic
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions
igneous
Quartz with Muscovite Mica
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate Hydroxide Fluoride (KAl2(AlSi3O10)(F,OH)2)
mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 cement)
sedimentary
Chert (Nodular Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Basalt (Crushed Roadstone)
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Sandstone (Iron-stained)
Clastic sedimentary rock (SiO2 with Fe2O3 staining)
sedimentary
Schist
Mica Schist (contains muscovite/biotite and quartz)
metamorphic
Muscovite Schist
Muscovite (KAl2(AlSi3O10)(OH)2) in Schist
metamorphic
Diorite
Intermediate plutonic igneous rock
Igneous
Basalt with Scoria/Vesicular Texture
Vesicular Basalt (Iron-rich/Oxidized)
igneous
Feldspathic Granite (likely Syenite or Granite Pegmatite)
Phaneritic Acidic Igneous Rock (KAlSi3O8 dominant with SiO2)
igneous
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
metamorphic
Sandstone with Iron Oxide
Arenite (SiO2 with Fe2O3 inclusions)
sedimentary