Rock Identifier

Category

Igneous, Sedimentary, And Metamorphic

Browse igneous, sedimentary, and metamorphic specimens identified by the Rock Identifier community.

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Corundum (Sapphire in Host Rock) (Corundum (Aluminum Oxide, Al2O3)) — mineral

Corundum (Sapphire in Host Rock)

Corundum (Aluminum Oxide, Al2O3)

Plagioclase Feldspar (specifically Albite/Oligoclase) ((Na,Ca)(Si,Al)4O8) — mineral

Plagioclase Feldspar (specifically Albite/Oligoclase)

(Na,Ca)(Si,Al)4O8

Banded Gneiss (Gneiss (variable mineral composition)) — metamorphic

Banded Gneiss

Gneiss (variable mineral composition)

Sodalite (Sodalite (Na8(Al6Si6O24)Cl2)) — mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Amethyst (Chevron or Banded Amethyst) (Silicon Dioxide (SiO2) with trace Iron (Fe)) — mineral

Amethyst (Chevron or Banded Amethyst)

Silicon Dioxide (SiO2) with trace Iron (Fe)

Sodalite (Sodalite (Na8(Al6Si6O24)Cl2)) — mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Potassium Feldspar (Orthoclase (KAlSi3O8)) — mineral

Potassium Feldspar

Orthoclase (KAlSi3O8)

Yellow Ocher (Limonite) (Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O) — mineral

Yellow Ocher (Limonite)

Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O

Mica-rich Pegmatite (Pegmatite (rich in Muscovite and Biotite)) — igneous

Mica-rich Pegmatite

Pegmatite (rich in Muscovite and Biotite)

Sodalite (Sodalite (Na8Al6Si6O24Cl2)) — mineral

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

Garnet Rhyolite (Rhyolite (high-silica volcanic rock) with almandine/spessartine garnet) — igneous

Garnet Rhyolite

Rhyolite (high-silica volcanic rock) with almandine/spessartine garnet

Bull Quartz (Milky Quartz) (Silicon Dioxide (SiO2)) — mineral

Bull Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz (with trace inclusions) (Silicon Dioxide (SiO2)) — mineral

Milky Quartz (with trace inclusions)

Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz with Chlorite/Moss Infusions (Silicon Dioxide (SiO2)) — mineral

Milky Quartz with Chlorite/Moss Infusions

Silicon Dioxide (SiO2)

Gneiss (Gneiss (a type of metamorphic rock)) — Metamorphic Rock

Gneiss

Gneiss (a type of metamorphic rock)

Metamorphic Rock

Quartz (Quartz (SiO₂ - Silicon Dioxide)) — Mineral

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Quartz (Quartz (SiO₂)) — mineral

Quartz

Quartz (SiO₂)

Ruby (Corundum) (Corundum (Aluminum Oxide with Chromium), Al2O3:Cr) — mineral

Ruby (Corundum)

Corundum (Aluminum Oxide with Chromium), Al2O3:Cr

Mica (Biotite or Phlogopite variety) (Phyllosilicate (complex mineral formula involving K, Mg, Fe, Al, Si, and O)) — mineral

Mica (Biotite or Phlogopite variety)

Phyllosilicate (complex mineral formula involving K, Mg, Fe, Al, Si, and O)

Quartz Vein in Host Rock (Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix) — Metamorphic or Igneous (context dependent)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix

Metamorphic or Igneous (context dependent)

Calcite (Calcite (CaCO₃, Calcium Carbonate)) — Mineral

Calcite

Calcite (CaCO₃, Calcium Carbonate)

Quartz (likely Milky Quartz or Chalcedony) (Quartz (SiO2 - Silicon Dioxide)) — Mineral

Quartz (likely Milky Quartz or Chalcedony)

Quartz (SiO2 - Silicon Dioxide)

Quartz (likely a clear or rock crystal variety) (Quartz (SiO2 - Silicon Dioxide)) — Mineral

Quartz (likely a clear or rock crystal variety)

Quartz (SiO2 - Silicon Dioxide)

Clear Quartz (Rock Crystal) (Quartz (SiO₂)) — Mineral

Clear Quartz (Rock Crystal)

Quartz (SiO₂)

Banded Rock (likely Quartz-rich) (Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals) — Mineral

Banded Rock (likely Quartz-rich)

Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals

Garnet Beads (Garnet Group (complex nesosilicates, e.g., Almandine Fe3Al2(SiO4)3)) — Mineral

Garnet Beads

Garnet Group (complex nesosilicates, e.g., Almandine Fe3Al2(SiO4)3)

Mixed Tumbled Gemstones and River Rocks (Mixed Decorative Stones (predominantly Silicon Dioxide - SiO2 variants)) — Mixed (Igneous, Sedimentary, Metamorphic, and Minerals)

Mixed Tumbled Gemstones and River Rocks

Mixed Decorative Stones (predominantly Silicon Dioxide - SiO2 variants)

Mixed (Igneous, Sedimentary, Metamorphic, and Minerals)

Quartz (Quartz (SiO2 - Silicon Dioxide)) — Mineral

Quartz

Quartz (SiO2 - Silicon Dioxide)

Quartz (Quartz (SiO₂ - Silicon Dioxide)) — Mineral

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Citrine (Silicon Dioxide (SiO2)) — mineral

Citrine

Silicon Dioxide (SiO2)

Smoky Quartz (Smoky Quartz (SiO2)) — mineral

Smoky Quartz

Smoky Quartz (SiO2)

Citrine Quartz (SiO2 (Silicon Dioxide with Iron impurities)) — mineral

Citrine Quartz

SiO2 (Silicon Dioxide with Iron impurities)

Citrine (Silicon Dioxide (SiO2)) — mineral

Citrine

Silicon Dioxide (SiO2)

Amazonite (K(AlSi3O8)) — mineral

Amazonite

K(AlSi3O8)

Quartz (Amethyst variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Amethyst variety)

Silicon Dioxide (SiO2)

Smoky Quartz (Faceted Beads) (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz (Faceted Beads)

Silicon Dioxide (SiO2)

Assorted Decorative Tumbled Stones (Quartz, Sodalite, Aventurine, Calcite) (Mixed Silicates and Carbonates (SiO2, Na8(Al6Si6O24)Cl2, CaCO3)) — mineral

Assorted Decorative Tumbled Stones (Quartz, Sodalite, Aventurine, Calcite)

Mixed Silicates and Carbonates (SiO2, Na8(Al6Si6O24)Cl2, CaCO3)