Rock Identifier

Category

Crystal

Browse crystal specimens identified by the Rock Identifier community.

Biotite (Black Mica) (Biotite [K(Mg,Fe)3(AlSi3O10)(F,OH)2]) — mineral

Biotite (Black Mica)

Biotite [K(Mg,Fe)3(AlSi3O10)(F,OH)2]

mineral
Schist (Micaceous) (Mica Schist (predominantly Muscovite or Biotite)) — metamorphic

Schist (Micaceous)

Mica Schist (predominantly Muscovite or Biotite)

metamorphic
Granite (Granite (Felsic Plutonic Rock)) — igneous

Granite

Granite (Felsic Plutonic Rock)

igneous
Aquamarine (Beryl (Be3Al2Si6O18)) — mineral

Aquamarine

Beryl (Be3Al2Si6O18)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral
Druzy Quartz (Quartz (Silicon Dioxide, SiO2)) — mineral

Druzy Quartz

Quartz (Silicon Dioxide, SiO2)

mineral
Garnet Schist (Almandine-Mica Schist) — metamorphic

Garnet Schist

Almandine-Mica Schist

metamorphic
Blue Calcite (Calcium Carbonate (CaCO3)) — mineral

Blue Calcite

Calcium Carbonate (CaCO3)

mineral
Pink Quartzite (Quartzite (primarily SiO2)) — metamorphic

Pink Quartzite

Quartzite (primarily SiO2)

metamorphic
Ruby in Fuchsite (often sold as Ruby in Zoisite) (Corundum (Al2O3) in Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)) — metamorphic

Ruby in Fuchsite (often sold as Ruby in Zoisite)

Corundum (Al2O3) in Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

metamorphic
Milky Quartz (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral
Mahogany Obsidian (Volcanic Glass with Hematite/Magnetite inclusions) — igneous

Mahogany Obsidian

Volcanic Glass with Hematite/Magnetite inclusions

igneous
Granite (Phaneritic Felsic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)) — igneous

Granite

Phaneritic Felsic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)

igneous
Granite (Granite (Felsic Intrusive Igneous Rock)) — igneous

Granite

Granite (Felsic Intrusive Igneous Rock)

igneous
Blue Celestite (with Galena) (Strontium sulfate (SrSO4) and Lead sulfide (PbS)) — mineral

Blue Celestite (with Galena)

Strontium sulfate (SrSO4) and Lead sulfide (PbS)

mineral
Rose Quartz with possible Manganese or Iron inclusions (SiO2 (Silicon Dioxide)) — mineral

Rose Quartz with possible Manganese or Iron inclusions

SiO2 (Silicon Dioxide)

mineral
Rose Quartz (Silicon dioxide (SiO2)) — mineral

Rose Quartz

Silicon dioxide (SiO2)

mineral
Aquamarine (Beryl (Be3Al2Si6O18 with Fe2+ impurities)) — mineral

Aquamarine

Beryl (Be3Al2Si6O18 with Fe2+ impurities)

mineral
Amber Inlay Jewelry (Fossilized Resin (C10H16O)) — Organic Gemstone (Biogenic)

Amber Inlay Jewelry

Fossilized Resin (C10H16O)

Organic Gemstone (Biogenic)
Fluorite (Purple variety) (Calcium Fluoride (CaF2)) — mineral

Fluorite (Purple variety)

Calcium Fluoride (CaF2)

mineral
Granite (Granite (Mainly Quartz, Feldspar, and Mica)) — igneous

Granite

Granite (Mainly Quartz, Feldspar, and Mica)

igneous
Dacite (Dacite (Intermediate volcanic rock)) — igneous

Dacite

Dacite (Intermediate volcanic rock)

igneous
Basalt (Basalt (Mafic Extrusive)) — igneous

Basalt

Basalt (Mafic Extrusive)

igneous
Basalt (Basalt (Extrusive Mafic Igneous)) — igneous

Basalt

Basalt (Extrusive Mafic Igneous)

igneous
Clear Quartz (Silicon dioxide (SiO2)) — mineral

Clear Quartz

Silicon dioxide (SiO2)

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

Amethyst

Silicon Dioxide with iron impurities (SiO2)

mineral
Jadeite (Jade) (Jadeite; NaAlSi2O6) — metamorphic

Jadeite (Jade)

Jadeite; NaAlSi2O6

metamorphic
Chalcedony (Smoky Quartz or Agate nodule fragment) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Smoky Quartz or Agate nodule fragment)

Silicon Dioxide (SiO2)

mineral
Garnet (Almandine (Fe3Al2(SiO4)3)) — mineral

Garnet

Almandine (Fe3Al2(SiO4)3)

mineral
Goldstone (Red) (Aventurine Glass) — Man-made material (Simulated Mineral)

Goldstone (Red)

Aventurine Glass

Man-made material (Simulated Mineral)
Rose Quartz (Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese) — mineral

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

mineral
Obsidian (Volcanic Glass (Primary component: SiO2)) — igneous

Obsidian

Volcanic Glass (Primary component: SiO2)

igneous
Obsidian (Volcanic Glass (Amorphous Silicon Dioxide, SiO2)) — igneous

Obsidian

Volcanic Glass (Amorphous Silicon Dioxide, SiO2)

igneous
Granite (Granite (Felsic Plutonic Rock)) — igneous

Granite

Granite (Felsic Plutonic Rock)

igneous
Pyrite (Iron Disulfide (FeS2)) — mineral

Pyrite

Iron Disulfide (FeS2)

mineral
Black Obsidian (Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)) — igneous

Black Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

igneous
Mica Schist (Foliated Metamorphic Rock (Schist)) — metamorphic

Mica Schist

Foliated Metamorphic Rock (Schist)

metamorphic
Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

metamorphic
Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

metamorphic
Dalmatian Stone (Dalmatian Jasper (actually a Peralkaline Igneous Rock)) — igneous

Dalmatian Stone

Dalmatian Jasper (actually a Peralkaline Igneous Rock)

igneous
Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

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

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Mineral