Pyrite
Iron Sulfide (FeS2)
mineral
Category
Igneous And Metamorphic
Browse igneous and metamorphic specimens identified by the Rock Identifier community.
Clear Quartz (or Rock Crystal)
Quartz (SiO₂)
Mineral
Corundum
Corundum (Al2O3)
Mineral
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica)
metamorphic
Greenstone / Diabase Porphyry
Porphyritic Diabase (Micro-gabbro)
Igneous
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Smoky Crystal fragment)
Silicon Dioxide (SiO2)
mineral
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
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
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
Limonite-stained Quartz
Silicon Dioxide (SiO2) with Iron Oxide/Hydroxide (FeO(OH)·nH2O) staining
mineral
Star Sapphire
Corundum (Al2O3) with Rutile inclusions
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Zircon
Zirconium Silicate (ZrSiO₄)
mineral
Labradorite
(Ca, Na)(Al, Si)4O8 (Plagioclase Feldspar)
mineral