Amethyst (Chevron or Banded Amethyst)
Silicon Dioxide (SiO2) with iron impurities
mineral
Category
Metamorphic Or Igneous
Browse metamorphic or igneous specimens identified by the Rock Identifier community.
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Red Garnet
Pyrope-Almandine series (Mg3Al2(SiO4)3 to Fe3Al2(SiO4)3)
mineral
Amethyst Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz (Vein Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
White Quartz (Milky Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Pebble
Clast (specifically a granule or small pebble)
Sedimentary
Baroque Pearl (and potentially a small Sapphire/Blue Topaz)
Pearl: Calcium Carbonate (aragonite or calcite) with conchiolin. Sapphire: Aluminum Oxide (Al2O3). Blue Topaz: Al2SiO4(F,OH)2.
Organic Gemstone (for pearl), Mineral (for sapphire/topaz)
Green Aventurine and Clear Quartz
Green Aventurine (Silicon Dioxide - SiO2 with Fuchsite inclusions); Clear Quartz (Silicon Dioxide - SiO2)
Mineral
Aquamarine
Beryl (Be3Al2Si6O18)
Mineral
Quartz Crystal
Quartz (SiO₂)
Mineral
Gneiss
Gneiss (a type of metamorphic rock)
Metamorphic Rock
Schist
Schist (various mineralogical compositions including mica, chlorite, talc, etc.)
Metamorphic
Milky Quartz with Country Rock contact
Silicon Dioxide (SiO2) in contact with Metamorphic/Igneous rock
mineral
Banded Rock (likely Quartz-rich)
Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals
Mineral
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
Mineral
Banded Gneiss
Gneiss (variable mineral composition)
metamorphic
Quartzite
Quartzite (primarily SiO₂)
metamorphic
Serpentine Jade (New Jade/Olive Jade)
Serpentinite (a rock composed primarily of serpentine minerals) / Mg3Si2O5(OH)4 for Antigorite and Lizardite
Mineral
Citrine
Citrine (Silicon Dioxide - SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Gravel variety)
Silicon Dioxide (SiO2)
mineral
Citrine
Citrine (Silicon Dioxide - SiO2)
mineral
Rough Dark Green Sapphire
Corundum (Al2O3)
mineral
Moonstone
Adularia (orthoclase) or Albite (plagioclase), a potassium aluminum silicate of the feldspar group
Mineral
Smoky Quartz
Quartz (SiO₂)
Mineral
Nephrite Jade (or Serpentine)
Nephrite (a variety of amphibole mineral tremolite-actinolite) or Serpentine Group minerals
Mineral/Rock
Greenstone / Glauconitic Siltstone
Metabasalt or Glauconite-rich Sedimentary Rock
metamorphic or sedimentary
Schist
N/A (a rock type, not a mineral formula)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Quartz with Mica (Schist/Pegmatite fragment)
Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)
igneous/metamorphic
Gold Ore in Quartz/Schist
Auriferous Quartz and Sulfide-bearing Schist
Metamorphic/Igneous (Hydrothermal)
Quartz (possibly milky quartz)
Quartz (Silica; SiO₂)
Mineral
Citrine Quartz
Crystalline Silicon Dioxide (SiO2) with Ferric Iron impurities
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz (Crystal Cluster)
Silicon Dioxide (SiO2) - Quartz Variety
mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Man-made Green Quartz (Lab-grown or Treated)
Silicon Dioxide (SiO2) with artificial coloration
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (likely tumbled or naturally water-worn)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Blue Sapphire
Corundum (Al2O3)
mineral