Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
Category
Browse mixed: igneous and sedimentary specimens identified by the Rock Identifier community.
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
Quartz
Silicon Dioxide (SiO2)
Quartz (Clear / Rock Crystal)
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Carnelian
Carnelian (a variety of Chalcedony), SiO2 (Silicon Dioxide)
Blue Calcite
Calcium Carbonate (CaCO3)
Quartz (Druzy)
Silicon Dioxide (SiO2)
Pyrite
Iron Sulfide (FeS2)
Quartz Crystal Fragment
Quartz (Silicon Dioxide, SiO2)
Pyrite
Iron Sulfide (FeS2)
Apatite
Fluorapatite, Chlorapatite, and Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))
Carnelian
Silicon dioxide / Chalcedony (SiO2)
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Banded Agate (specifically Carnelian Agate slice)
Chalcedony (cryptocrystalline variety of Quartz), SiO2
White Zircon
Zircon (Zirconium silicate, ZrSiO4)
Orthoclase Feldspar
Potassium aluminum silicate (KAlSi3O8)
Milky Quartz
Silicon Dioxide (SiO2)
Magnetite / Iron Ore
Magnetite (Fe3O4)
Blue Apatite
Apatite (Ca5(PO4)3(F,Cl,OH))
Quartz Geode (with possible Manganese or Goethite coating)
Silicon Dioxide (SiO2)
Quartz Vein / Milky Quartz
Silicon Dioxide (SiO2)
Carnelian (Orange Chalcedony)
Silicon Dioxide (SiO2) with iron oxide impurities
Quartz (Milky or Citrine-tinted)
Silicon Dioxide (SiO2)
Yellow Agate
Agate (Varietal form of Chalcedony/Quartz, SiO2)
Yellow Agate / Chalcedony
Silicon Dioxide (SiO2)
Chalcedony with inclusions (Agate/Quartz)
Silicon Dioxide (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Gneiss
High-grade regional metamorphic rock (Foliated)
Clear Quartz
Silicon Dioxide (SiO2)
Rough Quartz (likely Rose or Smoky variant)
Silicon Dioxide (SiO2)
White Calcite
Calcium Carbonate (CaCO3)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Quartz (Milky or Clear fragment)
Silicon Dioxide (SiO2)
Biotite Gneiss
Gneiss (complex mixture including Biotite K(Mg,Fe)3AlSi3O10(F,OH)2 and Quartz/Feldspar)
Quartz Geode Fragment
Silicon Dioxide (SiO2)
Quartz
Silicon dioxide (SiO2)
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
Quartz (Milky/Crystalline fragment)
Silicon Dioxide (SiO2)
Pyrite in Quartz
Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)