Mica Schist (with Golden/Biotite inclusions)
K(Mg,Fe)3AlSi3O10(F,OH)2 (Biotite), KAl2(AlSi3O10)(F,OH)2 (Muscovite)
Category
Browse metamorphic rock (formed from a fibrous crocidolite asbestos) specimens identified by the Rock Identifier community.
Mica Schist (with Golden/Biotite inclusions)
K(Mg,Fe)3AlSi3O10(F,OH)2 (Biotite), KAl2(AlSi3O10)(F,OH)2 (Muscovite)
Schist
Mica Schist
Quartzite
Quartzite (primarily SiO2)
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Gneiss
Gneissic Metamorphic Rock
Agate
Silicon Dioxide (SiO2) - Chalcedony variety
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
Schist
Mica Schist
Greenstone (Epidote/Chlorite-rich Metabasalt)
Greenschist / Epidosite (Ca2(Al,Fe)3(SiO4)3(OH))
Grey Quartzite Pebble
Quartzite (primarily SiO2 - Silicon Dioxide)
Smoky Quartz
Silicon Dioxide (SiO2)
Blue Apatite
Fluorapatite / Chlorapatite [Ca5(PO4)3(F,Cl,OH)]
Pebble
Clast (specifically a granule or small pebble)
Quartzite
Quartzite (primarily SiO2)
Rough Sapphire (Corundum)
Corundum (Al2O3)
Banded Agate
Agate (Cryptocrystalline variety of Quartz, SiO2)
Blue Sapphire
Corundum (Al2O3)
Greenschist
Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)
Amethyst
SiO2 (Silicon Dioxide with Iron impurities and natural radiation influence)
Quartzite Pebble
Quartzite (SiO2)
Granitic Gneiss
Gneiss (High-grade Metamorphic Rock)
Quartzite Pebble
Metamorphic Quartzite (SiO2)
Gneiss
Gneiss (High-grade Metamorphic Rock)
Quartzite
Quartzite (primarily SiO2)
Quartzite (or Quartz Rich Conglomerate)
Quartzite (SiO2 silicon dioxide)
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
Quartzite
Quartzite (SiO2)
Epidote
Epidote Group (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
Schist
Mica Schist
Quartzite (River Pebble)
Metamorphic Quartz (SiO2)
Rose Quartz
Silicon Dioxide (SiO2) with trace impurities of Ti, Mn, or Fe
Diorite Gneiss
Foliated Diorite Gneiss
Rose Quartz
Crystalline Silicon Dioxide with trace Titanium/Manganese/Iron (SiO2)
Selenite (Satin Spar)
Gypsum (CaSO4·2H2O)
Muscovite Schist
Mica Schist (KAl2(AlSi3O10)(OH)2)
Quartzite
Quartzite (SiO2)
Slate with Quartz Vein
Foliated Metamorphic Rock (Mainly Quartz, Muscovite, Chlorite)
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
Quartzite
Quartzite (primarily SiO2)
Pyrite on Quartz matrix
Iron Disulfide (FeS2) on Silicon Dioxide (SiO2)
River Cobble (Salt and Pepper Gneiss)
Gneiss (High-grade regional metamorphic rock)
Gneiss (specifically a Granitic Gneiss)
Gneiss (typically composed of Quartz, Feldspar, and Mica/Amphiboles)