Rock Identifier

Category

Organic Gemstone (Not A Mineral)

Browse organic gemstone (not a mineral) specimens identified by the Rock Identifier community.

Larimar and Fossil Coral (Pectolite (NaCa2Si3O8(OH)) and Hexagonaria/Petoskey Stone) — mineral and sedimentary

Larimar and Fossil Coral

Pectolite (NaCa2Si3O8(OH)) and Hexagonaria/Petoskey Stone

mineral and sedimentary

Olivine (Peridotite) (Magnesium Iron Silicate - (Mg, Fe)2SiO4) — igneous

Olivine (Peridotite)

Magnesium Iron Silicate - (Mg, Fe)2SiO4

Garnet Schist or Garnet-bearing Quartzite (Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)) — metamorphic

Garnet Schist or Garnet-bearing Quartzite

Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)

Amethyst (Quartz (Silicon Dioxide with Iron impurities), SiO2) — mineral

Amethyst

Quartz (Silicon Dioxide with Iron impurities), SiO2

Amethyst (SiO2 (Silicon Dioxide) - Purple variety of Crystalline Quartz) — mineral

Amethyst

SiO2 (Silicon Dioxide) - Purple variety of Crystalline Quartz

Amber (Fossilized Tree Resin (Generic formula: C10H16O)) — mineral

Amber

Fossilized Tree Resin (Generic formula: C10H16O)

Amethyst (Quartz (Silicon Dioxide, SiO2) with iron impurities) — mineral

Amethyst

Quartz (Silicon Dioxide, SiO2) with iron impurities

Turquoise (likely Stabilized or Dyed Howlite/Magnesite) (Hydrated phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O) — mineral

Turquoise (likely Stabilized or Dyed Howlite/Magnesite)

Hydrated phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O

Garnet (likely Almandine or Pyrope) (Garnet Group, Nesosilicates (Complex chemistry, e.g., Almandine: Fe3Al2Si3O12)) — mineral

Garnet (likely Almandine or Pyrope)

Garnet Group, Nesosilicates (Complex chemistry, e.g., Almandine: Fe3Al2Si3O12)

Obsidian (Volcanic glass (SiO2 - Silicon dioxide predominant composition)) — Igneous

Obsidian

Volcanic glass (SiO2 - Silicon dioxide predominant composition)

Peridot (Olivine) (Olivine ((Mg,Fe)2SiO4)) — Mineral

Peridot (Olivine)

Olivine ((Mg,Fe)2SiO4)

Rutilated Quartz (SiO2 (Quartz) with TiO2 (Rutile inclusions)) — Mineral

Rutilated Quartz

SiO2 (Quartz) with TiO2 (Rutile inclusions)

Amethyst (SiO2 (Silicon Dioxide) - a variety of Quartz) — Mineral

Amethyst

SiO2 (Silicon Dioxide) - a variety of Quartz

Quartz (likely macrocrystalline variety) (Quartz (SiO₂)) — Mineral

Quartz (likely macrocrystalline variety)

Quartz (SiO₂)

Green Aventurine (Aventurine (a variety of Quartz, SiO2 with fuchsite inclusions)) — Mineral

Green Aventurine

Aventurine (a variety of Quartz, SiO2 with fuchsite inclusions)

Blue Tiger's Eye (Riebeckite (crocidolite variety)) — Mineral

Blue Tiger's Eye

Riebeckite (crocidolite variety)

Garnet-Mica Schist (Schist (variety with Almandine Garnet, Fe3Al2(SiO4)3)) — metamorphic

Garnet-Mica Schist

Schist (variety with Almandine Garnet, Fe3Al2(SiO4)3)

Agate (Chert/Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Agate (Chert/Chalcedony)

Silicon Dioxide (SiO2)

Arsenopyrite in Quartz Matrix (Arsenopyrite (FeAsS) with Quartz (SiO2)) — Mineral in a Metamorphic/Hydrothermal rock

Arsenopyrite in Quartz Matrix

Arsenopyrite (FeAsS) with Quartz (SiO2)

Mineral in a Metamorphic/Hydrothermal rock

Turquoise (beads) (Turquoise; CuAl6(PO4)4(OH)8·4H2O) — Mineral

Turquoise (beads)

Turquoise; CuAl6(PO4)4(OH)8·4H2O

Carnelian (Carnelian (a variety of Chalcedony, SiO2)) — Mineral

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

Sapphire (Corundum) (Corundum (Al2O3)) — mineral

Sapphire (Corundum)

Corundum (Al2O3)

Jasper (specifically Red Jasper/Chert) (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Jasper (specifically Red Jasper/Chert)

Silicon Dioxide (SiO2) with iron oxide inclusions

Petrified Wood (Silicified wood, primarily composed of Quartz (SiO2)) — Mineral, often found in sedimentary deposits

Petrified Wood

Silicified wood, primarily composed of Quartz (SiO2)

Mineral, often found in sedimentary deposits

Diamond (Lesedi La Rona specimen) (Diamond (Pure Carbon, C)) — mineral

Diamond (Lesedi La Rona specimen)

Diamond (Pure Carbon, C)

Carnelian (Silicon Dioxide (SiO2) - variety of Chalcedony) — mineral

Carnelian

Silicon Dioxide (SiO2) - variety of Chalcedony

Chalcedony (Silicon dioxide (SiO2) - Microcrystalline quartz) — mineral

Chalcedony

Silicon dioxide (SiO2) - Microcrystalline quartz

Clear Quartz (Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Diamond (in jewelry setting) (Diamond (Carbon, C)) — mineral

Diamond (in jewelry setting)

Diamond (Carbon, C)

Turquoise (Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O) — mineral

Turquoise

Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O

Carnelian (Carnelian (a variety of Chalcedony, which is a microcrystalline quartz, SiO2)) — Mineral (variety of Chalcedony)

Carnelian

Carnelian (a variety of Chalcedony, which is a microcrystalline quartz, SiO2)

Mineral (variety of Chalcedony)

Garnet Schist (Almandine Garnet in Mica Schist (Fe3Al2(SiO4)3)) — metamorphic

Garnet Schist

Almandine Garnet in Mica Schist (Fe3Al2(SiO4)3)

Moonstone (Tumbled) (Orthoclase Feldspar (KAlSi3O8) with inclusions of Albite) — mineral

Moonstone (Tumbled)

Orthoclase Feldspar (KAlSi3O8) with inclusions of Albite

Schist (Lepidoblastic Mica Schist) — metamorphic

Schist

Lepidoblastic Mica Schist

Chert (Flint variety) (Chert (Cryptocrystalline variety of Quartz, SiO2)) — sedimentary

Chert (Flint variety)

Chert (Cryptocrystalline variety of Quartz, SiO2)

Unakite (Epidotized Granite) (Epidote-Feldspar-Quartz Rock) — metamorphic

Unakite (Epidotized Granite)

Epidote-Feldspar-Quartz Rock

Quartz (possibly milky quartz or quartz with inclusions) (SiO2 (Silicon Dioxide)) — Mineral

Quartz (possibly milky quartz or quartz with inclusions)

SiO2 (Silicon Dioxide)

Amethyst (Amethyst (Silicon Dioxide - SiO2 with impurities of Fe3+)) — mineral

Amethyst

Amethyst (Silicon Dioxide - SiO2 with impurities of Fe3+)

Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Glass (Amorphous Silicon Dioxide (SiO2)) — mineraloid

Glass

Amorphous Silicon Dioxide (SiO2)

Mahogany Obsidian (Volcanic Glass (predominantly SiO2 with Fe2O3 inclusions)) — igneous

Mahogany Obsidian

Volcanic Glass (predominantly SiO2 with Fe2O3 inclusions)

Amethyst (Amethyst (Silicon Dioxide with iron impurities, SiO2)) — mineral

Amethyst

Amethyst (Silicon Dioxide with iron impurities, SiO2)