Gneiss
Gneiss (Metamorphic rock of variable composition, typically SiO2 rich)
Category
Browse metamorphic or sedimentary specimens identified by the Rock Identifier community.
Gneiss
Gneiss (Metamorphic rock of variable composition, typically SiO2 rich)
Rough Garnet (Almandine)
Almandine Garnet (Fe3Al2(SiO4)3)
Quartz
Silicon Dioxide (SiO2)
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)
Graphite-veined Quartzite
Meta-sedimentary Quartzite with Carbonaceous/Graphitic Inclusions (SiO2 + C)
Jasper (Iron-stained Chert)
Silicon Dioxide (SiO2)
Black Tourmaline (Schorl)
Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3(OH)4)
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
Calcite
Calcium Carbonate (CaCO3)
Agate
Banded Chalcedony (SiO2)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Pyrite
Iron Disulfide (FeS2)
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
Orange Calcite
Calcium Carbonate (CaCO3)
Rhodochrosite
Manganese carbonate (MnCO3)
Orange Calcite
Calcium Carbonate (CaCO3)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Orange Calcite
Calcium Carbonate (CaCO3)
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
Magnetic Hematite (Man-made)
Iron Oxide (Fe2O3) with Barium-Strontium Ferrite
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium and/or Vanadium impurities
Hematite
Iron(III) oxide (Fe2O3)
White Jade / White Chalcedony
Nephrite Jade (Ca2(Mg,Fe)5Si8O22(OH)2) or Chalcedony (SiO2)
Schist
Schist (various mineralogical compositions including mica, chlorite, talc, etc.)
Quartz (Milky/Smoky variety on matrix)
Silicon Dioxide (SiO2)
Banded Rock (likely Quartz-rich)
Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals
Kyanite
Kyanite (Al2SiO5)
Blue Dumortierite in Quartz
Al7(BO3)(SiO4)3O3 (Dumortierite)
Epidote
Epidote - Ca2(Al,Fe)3(SiO4)3(OH)
Gneiss
Gneiss
Pebble
Clast (specifically a granule or small pebble)
Jasper with Epidote Vein
Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate (Ca2(Al,Fe)3(SiO4)3(OH))
Sandstone, Quartzite, and River Pebbles
Silicon Dioxide (SiO2) based Sedimentary/Metamorphic structures
Blue Apatite
Apatite, Ca5(PO4)3(F,Cl,OH)
Dumortierite Quartz
Dumortierite-bearing Quartz (Al7BO3(SiO4)3O3)
Tourmaline (likely Schorl)
Tourmaline Group Mineral (e.g., Schorl for black varieties); (Na,Ca)(Li,Mg,Fe,Mn,Al)3Al6(BO3)3Si6O18(OH)4
Quartzite / Sandstone / Chert Mix
Silicon Dioxide (SiO2)
Pyrite
Iron Disulfide (FeS2)
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
Quartzite
Quartzite (primarily SiO2)