Corundum
Corundum (Al2O3)
Mineral
Category
Igneous Or Metamorphic
Browse igneous or metamorphic specimens identified by the Rock Identifier community.
Greenschist
Greenschist (comprising Actinolite, Chlorite, and Epidote)
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Metagabbro / Epidote Gneiss
Epidote bearing Hornblende Gneiss
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Epidote (Unakite variety)
Epidosite (Metasomatic rock containing Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Greenschist (Chlorite Schist)
Greenschist (containing chlorite, actinolite, and epidote)
metamorphic
Granite Gneiss with Garnet
Garnetiferous Gneiss
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss with Quartz Veining
Gneiss (High-grade regional metamorphic rock)
metamorphic
Greenschist (Greenstone)
Greenschist
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Pyrite
Iron Disulfide (FeS2)
mineral
Rough Gemstone Grains (Mixed Sapphires and Quartz)
Corundum (Al2O3) and Quartz (SiO2)
mineral
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
mineral
Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Amethyst
Silicon Dioxide with Iron impurities (SiO2)
mineral
Quartz (specifically Milky/White Quartz)
Silicon Dioxide (SiO2)
mineral
Feldspar
KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Biotite / Black Mica
Biotite K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Quartz / Calcite Vein Rock
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)
mineral
Quartz (Milky/Rose variety)
Silicon Dioxide (SiO2)
mineral
Clear Quartz Crystal
Quartz (Silicon Dioxide, SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
![Milky Quartz with Mica (Silicon Dioxide (SiO2) with Muscovite Mica [KAl2(AlSi3O10)(OH)2]) — mineral](https://media.rockidentification.com/6c87e860-d6cd-4578-9a1b-deeb0f1c14f4-thumbnail.jpg)
Milky Quartz with Mica
Silicon Dioxide (SiO2) with Muscovite Mica [KAl2(AlSi3O10)(OH)2]
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Amazonite
K(AlSi3O8) - Lead-bearing Microcline (Tectosilicate)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Black Sapphire (Basaltic Blue Sapphire)
Corundum (Al2O3)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Citrine (likely Heat-Treated)
Quartz (Silicon Dioxide, SiO2)
mineral
Ruby and Diamond Heart Pendant
Corundum (Al2O3) and Diamond (C)
mineral