Blue Sapphire
Corundum (Al2O3)
Category
Browse metamorphic rock (for both nephrite and jadeite) specimens identified by the Rock Identifier community.
Blue Sapphire
Corundum (Al2O3)
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
Biotite (Black Mica)
Biotite (K(Mg,Fe++)3AlSi3O10(OH,F)2)
Gneiss
High-grade Metamorphic Gneiss
Milky Quartz
Silicon Dioxide (SiO2)
Gneiss
Metamorphic rock of high-grade regional metamorphism
Muscovite Mica
Muscovite: KAl2(AlSi3O10)(OH)2
Milky Quartz
Quartz / Silicon Dioxide (SiO2)
Lapis Lazuli (Low Grade)
Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2)
Quartzite with Quartz Vein
Quartzite (primarily SiO2)
Gneiss
Gneiss
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Mixed Quartz and River Pebbles (Stone Collection)
Mixed assortment containing mainly Silicon Dioxide (SiO2)
Lapis Lazuli
Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
Milky Quartz with Country Rock contact
Silicon Dioxide (SiO2) in contact with Metamorphic/Igneous rock
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(OH)2
Amphibolite with Hornblende
Amphibole-rich Metamorphic Rock (Ca2(Mg,Fe)5Si8O22(OH)2)
Clear Quartz Crystal
Quartz (Silicon Dioxide, SiO2)
Quartzite (River Cobble)
SiO2 (Quartz-rich Metamorphic Rock)
Quartzite Pebble
Quartzite (primarily SiO2)
Lapis Lazuli
Lazurite-dominant Metamorphic Rock (complex aluminosilicate)
Quartzite
Quartzite (primarily SiO2)
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4
Red Quartzite
Quartzite (primarily SiO2)
Granodiorite (Gneissic texture)
Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)
Kyanite
Kyanite (Al2SiO5)
Slate
Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)
Quartz Vein in Host Rock
Quartz (SiO2) in Mafic or Sedimentary Matrix
Schist
Mica Schist
Quartzite (River Pebble)
Recrystallized Quartz (SiO2)
Glaucophane Schist (Blueschist)
Blueschist (Glaucophane-bearing schist)
Blue Quartz (Aventurine)
Silicon Dioxide (SiO2) with inclusions of crocidolite or dumortierite
Unakite
Epidotized Granite
Banded Agate (Polished Slice)
Chalcedony (cryptocrystalline Quartz), SiO2
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
Clear Quartz
Silicon dioxide (SiO2)
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2
Quartzite
Quartzite (SiO2)
Quartz vein in Host Rock
Crystalline Silicon Dioxide (SiO2) in Lithic Matrix
Serpentine
Antigorite/Lizardite (Mg,Fe)3Si2O5(OH)4
Quartz Vein in Schist
Quartz (SiO2) in Mica Schist
Milky Quartz
Quartz (Silicon Dioxide, SiO2)