Rock Identifier

Category

Organic Gemstone (Not A Mineral)

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

Learn about Organic Gemstone (Not A Mineral) in the encyclopedia

Black Shale

Black Shale

Jet

Jet

Malachite

Malachite

Sapropel

Sapropel

Bituminous Shale

Bituminous Shale

Red Garnet

Red Garnet

Shungite

Shungite

Anatase

Anatase

Sperrylite

Sperrylite

Amber

Amber

Hutcheonite

Hutcheonite

Coal

Coal

Jasper (likely Polychrome or Mookaite variants) (Silicon Dioxide (SiO2) with iron oxide and hydroxide inclusions) — sedimentary (chemically precipitated)

Jasper (likely Polychrome or Mookaite variants)

Silicon Dioxide (SiO2) with iron oxide and hydroxide inclusions

sedimentary (chemically precipitated)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

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)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Shale with Plant Fossils / Carbonaceous Shale (Laminated Mudrock (Siliciclastic)) — sedimentary

Shale with Plant Fossils / Carbonaceous Shale

Laminated Mudrock (Siliciclastic)

Cubic Zirconia (Diamond Simulant) (Zirconium Dioxide (ZrO2)) — gemstone

Cubic Zirconia (Diamond Simulant)

Zirconium Dioxide (ZrO2)

Carnelian (Carnelian (SiO2 with Fe2O3 impurities)) — mineral

Carnelian

Carnelian (SiO2 with Fe2O3 impurities)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Charoite (K(Ca,Na)2Si4O10(OH,F) · nH2O) — mineral

Charoite

K(Ca,Na)2Si4O10(OH,F) · nH2O

Larimar (Pectolite) (NaCa2Si3O8(OH)) — mineral

Larimar (Pectolite)

NaCa2Si3O8(OH)

Schorl (Black Tourmaline) (Sodium iron aluminum borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)) — mineral

Schorl (Black Tourmaline)

Sodium iron aluminum borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Quartz (Yellow/Citrine variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Yellow/Citrine variety)

Silicon Dioxide (SiO2)

Emerald in Matrix (Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities) — mineral

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Turquoise (Dyed Howlite/Magnesite) (CuAl6(PO4)4(OH)8·4H2O (Natural Turquoise) or Ca2B5SiO9(OH)5 (Howlite)) — mineral

Turquoise (Dyed Howlite/Magnesite)

CuAl6(PO4)4(OH)8·4H2O (Natural Turquoise) or Ca2B5SiO9(OH)5 (Howlite)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Iron-stained Quartz (Silicon Dioxide (SiO2) with iron oxide inclusions) — mineral

Iron-stained Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

Hematite (Botryoidal) (Hematite (Fe2O3)) — mineral

Hematite (Botryoidal)

Hematite (Fe2O3)

Lake Superior Agate (Chalcedony (Silicon Dioxide, SiO2) with Iron impurities) — mineral

Lake Superior Agate

Chalcedony (Silicon Dioxide, SiO2) with Iron impurities

Rose Quartz (SiO2 (Crystalline Quartz with trace inclusions)) — mineral

Rose Quartz

SiO2 (Crystalline Quartz with trace inclusions)

Citrine Quartz (likely heat-treated) (Silicon Dioxide (SiO2)) — mineral

Citrine Quartz (likely heat-treated)

Silicon Dioxide (SiO2)

Rhodonite (Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3) — mineral

Rhodonite

Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3

Pearl (Biogenic Calcium Carbonate (Aragonite and Conchiolin), CaCO3) — mineral

Pearl

Biogenic Calcium Carbonate (Aragonite and Conchiolin), CaCO3

Aquamarine (Beryl (Be3Al2Si6O18 with iron impurities)) — mineral

Aquamarine

Beryl (Be3Al2Si6O18 with iron impurities)

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

Agate / Banded Chalcedony

Agate (Silicon Dioxide / SiO2)

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

Carnelian Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

Garnet (Garnet group species (likely Almandine, Fe3Al2(SiO4)3)) — mineral

Garnet

Garnet group species (likely Almandine, Fe3Al2(SiO4)3)

Alexandrite (Chrysoberyl (BeAl2O4 with Chromium traces)) — mineral

Alexandrite

Chrysoberyl (BeAl2O4 with Chromium traces)

Carnelian (Carnelian Agate (Silica: SiO2)) — mineral

Carnelian

Carnelian Agate (Silica: SiO2)

Smoky Quartz (with Iron Oxidation) (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz (with Iron Oxidation)

Silicon Dioxide (SiO2)

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

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

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

Carnelian (Orange Agate/Chalcedony)

Silicon Dioxide (SiO2) - variety of Chalcedony

Milky Quartz Vein with Matrix (Silicon Dioxide (SiO2)) — mineral

Milky Quartz Vein with Matrix

Silicon Dioxide (SiO2)

Ruby (Raw Corundum) (Corundum (Al2O3 with Chromium impurities)) — mineral

Ruby (Raw Corundum)

Corundum (Al2O3 with Chromium impurities)

Quartz (Common or Milky Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Common or Milky Quartz)

Silicon Dioxide (SiO2)

Eudialyte (Eudialyte (Na4(Ca,Ce)2(Fe2+,Mn,Y)ZrSi8O22(OH,Cl)2)) — mineral

Eudialyte

Eudialyte (Na4(Ca,Ce)2(Fe2+,Mn,Y)ZrSi8O22(OH,Cl)2)

Tiger's Eye (Silicon Dioxide with Crocidolite (SiO2)) — mineral

Tiger's Eye

Silicon Dioxide with Crocidolite (SiO2)

Black Opal (Hydrated Silica (SiO2·nH2O)) — mineral

Black Opal

Hydrated Silica (SiO2·nH2O)

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

Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

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

Quartz (Milky Variant)

Quartz (Silicon Dioxide, SiO2)

Moonstone (Orthoclase Feldspar ((K,Na)AlSi3O8) with Albite inclusions) — mineral

Moonstone

Orthoclase Feldspar ((K,Na)AlSi3O8) with Albite inclusions