Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)
Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.
Metamorphic, Mineral (within a rock type)
Category
Sedimentary Or Metamorphic (Base Substrate)
Browse sedimentary or metamorphic (base substrate) specimens identified by the Rock Identifier community.
Ferruginous Quartz (Iron-stained Quartzite)
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
metamorphic
Greenstone (Epidisite / Chlorite Schist)
Metabasalt (often contains Epidote Ca2Al2(Fe3+,Al)(SiO4)(Si2O7)O(OH) and Chlorite)
metamorphic
Rough Gemstone Grains (Mixed Sapphires and Quartz)
Corundum (Al2O3) and Quartz (SiO2)
mineral
Schist
Mica Schist
metamorphic
Blue Sapphire
Corundum (Al2O3)
mineral
Conglomerate (Red Sandstone variety)
Clastic Sedimentary Rock (Conglomeratic Sandstone)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Granitic Pegmatite (Muscovite and Quartz)
Pegmatite (KAl2(AlSi3O10)(OH)2 / SiO2)
igneous
Limestone
Carbonate rock (CaCO3)
sedimentary
Sandstone (Graywacke)
Arenite / Graywacke (SiO2 with lithic fragments)
sedimentary
Sandstone with Manganese Dendrites
Clastic Sedimentary Rock (SiO2 based with MnO2 inclusions)
sedimentary
Limestone
Sedimentary Calcite (CaCO3)
sedimentary
Quartz-veined Sedimentary Rock
Hydrothermally veined Clastic Sedimentary Rock (SiO2 veins in Matrix)
sedimentary
Sandstone (Quartz-rich)
Arenite
sedimentary
Fuchsite (Green Muscovite in Quartz)
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Mica Schist
Mica Schist (Quartz-Biotite-Muscovite Schist)
metamorphic
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg,Fe)3Si2O5(OH)4
metamorphic
Greenstone (Greenschist facies)
Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)
metamorphic
Schist
Mica Schist
metamorphic
Mica Schist
Mica Schist (primarily Muscovite and Biotite micas)
metamorphic
Limestone (specifically Grainstone or Micrite)
Calcium Carbonate (CaCO3)
sedimentary
Muscovite Mica (Golden/Yellow variety)
KAl2(AlSi3O10)(F,OH)2
mineral
Schist
Mica Schist
metamorphic
Serpentine
Serpentinite (group of minerals: (Mg,Fe,Ni,Al)3Si2O5(OH)4)
metamorphic
Bituminous Coal
Organic Sedimentary Rock (Carbon-based)
sedimentary
Schist
Schist (primarily mica-schist)
metamorphic
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Mica Schist
Mica Schist (Main mineral constituents: Muscovite/Biotite, Quartz, Feldspar)
metamorphic
Quartz (likely Rose Quartz or Milky Quartz based on color)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Quartzite
Hydrothermal Quartz or Quartzite (SiO2)
metamorphic
Quartzite (Milky Quartz Cobble)
Silicon Dioxide (SiO2)
Metamorphic
Pet Rock (Man-made Quartzite or Granite Cobble)
Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica
igneous or metamorphic (base stone); anthropogenic (decoration)
Sandstone
Arenite (primarily SiO2)
sedimentary
Mica Schist
Mica Schist (Quartz-Biotit-Muscovite Schist)
metamorphic
Sandstone (Ferruginous)
Arenite (Fe-bearing Clastic Sedimentary Rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Chert (and/or River Pebble)
Microcrystalline silica (SiO2)
sedimentary
Dalmation Stone (often called Dalmatian Jasper)
Peralkaline Rock (Microgranite/Aplite), SiO2 with inclusions of Arfvedsonite
igneous
Ferruginous Sandstone
Arenite with Iron-oxide cement
sedimentary
Fuchsite (Green Muscovite)
K(Al,Cr)2(AlSi3O10)(OH)2
Mineral