Rock Identifier

Category

Gemstone

Browse gemstone specimens identified by the Rock Identifier community.

Chert (and Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (and Flint)

Silicon Dioxide (SiO2)

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Chert (Nodule) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Nodule)

Silicon Dioxide (SiO2)

Green Kyanite (Kyanite (Al2SiO5)) — mineral

Green Kyanite

Kyanite (Al2SiO5)

Obsidian (Obsidian (Volcanic Glass, SiO2)) — igneous

Obsidian

Obsidian (Volcanic Glass, SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Labradorite (Labradorite ((Ca, Na)(Al, Si)4O8)) — mineral

Labradorite

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

Chert (Flint Nodules) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Flint Nodules)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Herkimer Diamond (Quartz (Silica - SiO2)) — mineral

Herkimer Diamond

Quartz (Silica - SiO2)

Diamond (Cut jewelry specimen) (Diamond (pure Carbon, C)) — mineral

Diamond (Cut jewelry specimen)

Diamond (pure Carbon, C)

Jasper (Jasper (Silica/Quartz) - SiO2) — sedimentary

Jasper

Jasper (Silica/Quartz) - SiO2

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2) — mineral

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Tiger's Eye (Pseudomorph of Quartz after Crocidolite (SiO2)) — metamorphic

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Jasper (Silicon Dioxide (SiO2) - Impure Variety of Chert) — sedimentary

Jasper

Silicon Dioxide (SiO2) - Impure Variety of Chert

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Flower Agate (Chalcedony (Silicon Dioxide, SiO2) with Opaque Spherulitic Inclusions) — mineral

Flower Agate

Chalcedony (Silicon Dioxide, SiO2) with Opaque Spherulitic Inclusions

Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)

Sodalite (Na8(Al6Si6O24)Cl2) — mineral

Sodalite

Na8(Al6Si6O24)Cl2

Diamond (Diamond (Pure Carbon, C)) — mineral

Diamond

Diamond (Pure Carbon, C)

Quartz (specifically Milky or Rose Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (specifically Milky or Rose Quartz)

Silicon Dioxide (SiO2)

Citrine (Silicon Dioxide (SiO2) with ferric iron impurities) — mineral

Citrine

Silicon Dioxide (SiO2) with ferric iron impurities

Chert (Flint) (Microcrystalline Opaline Silica (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline Opaline Silica (SiO2)

Pyrite (on Quartz/Host Rock) (Iron Sulfide (FeS₂)) — mineral

Pyrite (on Quartz/Host Rock)

Iron Sulfide (FeS₂)

Strawberry Quartz (Quartz (SiO2) with inclusions of Goethite or Hematite) — Mineral

Strawberry Quartz

Quartz (SiO2) with inclusions of Goethite or Hematite

Serpentine (Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4) — metamorphic

Serpentine

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4

Rhodochrosite (Manganese Carbonate (MnCO3)) — mineral

Rhodochrosite

Manganese Carbonate (MnCO3)

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

Blue Sodalite (Tumbled)

Sodalite (Na8(Al6Si6O24)Cl2)

Banded Agate (specifically Lace Agate type) (Silicon Dioxide (SiO2)) — mineral

Banded Agate (specifically Lace Agate type)

Silicon Dioxide (SiO2)

Chrome Diopside (Diopside (Magnesium Calcium Silicate) - CaMgSi2O6 + Cr) — mineral

Chrome Diopside

Diopside (Magnesium Calcium Silicate) - CaMgSi2O6 + Cr

Epidote (Epidote - {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)) — mineral

Epidote

Epidote - {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

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

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

Serpentine (Serpentinite (complex of Mg, Fe, Ni, Al, Zn, Mn)Si2O5(OH)4) — metamorphic

Serpentine

Serpentinite (complex of Mg, Fe, Ni, Al, Zn, Mn)Si2O5(OH)4

Blue Sapphire (Corundum (Al2O3 - Aluminum Oxide)) — mineral

Blue Sapphire

Corundum (Al2O3 - Aluminum Oxide)

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

Amethyst (Quartz)

SiO2 (Silicon Dioxide)

Orange Quartzite (Tumbled Beach Pebble) (Quartzite (primarily SiO2)) — metamorphic

Orange Quartzite (Tumbled Beach Pebble)

Quartzite (primarily SiO2)

Malachite (Malachite (Copper Carbonate Hydroxide, Cu2CO3(OH)2)) — mineral

Malachite

Malachite (Copper Carbonate Hydroxide, Cu2CO3(OH)2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Carnelian Agate (Silicon Dioxide with Hematite impurities (SiO2 + Fe2O3)) — mineral

Carnelian Agate

Silicon Dioxide with Hematite impurities (SiO2 + Fe2O3)

Carnelian (Red Chalcedony) (Silicon Dioxide (SiO2) with iron oxide impurities) — mineral

Carnelian (Red Chalcedony)

Silicon Dioxide (SiO2) with iron oxide impurities

Ruby (Corundum (Al2O3) with Chromium traces) — mineral

Ruby

Corundum (Al2O3) with Chromium traces

Aquamarine (Beryl (Be3Al2Si6O18), specifically the blue-green variety) — Mineral

Aquamarine

Beryl (Be3Al2Si6O18), specifically the blue-green variety