Quartz (Iron-stained)
Silicon Dioxide (SiO2)
Category
Browse mixed: igneous and sedimentary specimens identified by the Rock Identifier community.
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
Gneiss (with Quartz and Biotite Mica)
Gneiss
Milky Quartz
Silicon Dioxide (SiO2)
Quartz / Rock Crystal
Silicon Dioxide (SiO2)
Clear Quartz Cluster
Silicon Dioxide (SiO2)
Clear Quartz (Druzy)
Crystalline Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Banded Gneiss
Gneiss
Orange Calcite
Calcium Carbonate (CaCO3)
Green Calcite
Calcium Carbonate (CaCO3)
Gneiss
Gneiss (High-grade Metamorphic Rock)
Gneiss
Gneiss (High-grade regional metamorphic rock)
Pyrite
Iron Sulfide (FeS2)
Quartz Geode
Silicon Dioxide (SiO2)
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Hematite
Hematite (Iron(III) oxide, Fe2O3)
Gneiss
Gneissic Metamorphic Rock (Mineral composition: Quartz, Feldspar, Amphibole/Biotite)
Quartz (Milky/Chalcedony variety)
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
Garnet Gneiss
Gneiss containing almandine-pyrope garnet
Gneiss
Gneiss
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Chalcedony (Botryoidal or Tumbled)
Chalcedony (SiO₂)
Pyrite (Iron Pyrites)
Iron Sulfide (FeS2)
Gneiss
Gneiss
Blue Calcite
Calcium Carbonate (CaCO3)
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Quartz (Citrine or Smoky variety)
Silicon Dioxide (SiO2)
Pyrite
Iron Sulfide (FeS2)
Clear Quartz (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
Yellow Chalcedony (likely carnelian or yellow agate)
Silicon Dioxide (SiO₂)
Yellow Quartz
Silicon Dioxide (SiO2)
Quartz
Quartz (Silicon Dioxide - SiO2)
Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)
Quartz (SiO₂)
Pyrite
Iron Disulfide (FeS2)
Magnetite / Iron Ore
Magnetite (Fe3O4)
Sandstone (Quartzose)
Arenite (SiO2 based)
Smoky Quartz
Silicon Dioxide (SiO2)
Tumbled Moonstone
Feldspar (Orthoclase/Albite), KAlSi3O8
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)