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

Larimar (Pectolite) (NaCa2Si3O10(OH) (Sodium Calcium Silicate Hydroxide)) — mineral

Larimar (Pectolite)

NaCa2Si3O10(OH) (Sodium Calcium Silicate Hydroxide)

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

Moonstone

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

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

Alexandrite

Chrysoberyl (BeAl2O4 with Chromium impurities)

Tanzanite (Blue Zoisite (Ca2Al3(SiO4)3(OH))) — mineral

Tanzanite

Blue Zoisite (Ca2Al3(SiO4)3(OH))

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

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

Labradorite

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

Carnelian (Chalcedony (SiO2) with Iron Oxide inclusions) — mineral

Carnelian

Chalcedony (SiO2) with Iron Oxide inclusions

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Carnelian (a variety of Chalcedony) (SiO2 (Silicon Dioxide) primarily colored by iron oxide (Hematite)) — mineral

Carnelian (a variety of Chalcedony)

SiO2 (Silicon Dioxide) primarily colored by iron oxide (Hematite)

Aquamarine (Beryl (Be3Al2Si6O18)) — mineral

Aquamarine

Beryl (Be3Al2Si6O18)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Beryl (Aquamarine) (Beryllium Aluminum Cyclosilicate (Be3Al2Si6O18)) — mineral

Beryl (Aquamarine)

Beryllium Aluminum Cyclosilicate (Be3Al2Si6O18)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Sodalite (Chloric sodium aluminum silicate (Na8(Al6Si6O24)Cl2)) — mineral

Sodalite

Chloric sodium aluminum silicate (Na8(Al6Si6O24)Cl2)

Rough Quartz (Iron-stained) (Silicon Dioxide (SiO2)) — mineral

Rough Quartz (Iron-stained)

Silicon Dioxide (SiO2)

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

Quartz (Milky/Clear)

Silicon Dioxide (SiO2)

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

Carnelian

SiO2 (Silicon Dioxide) - Carnelian variety of Chalcedony

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

Quartz (Milk/Citrine variety)

Silicon Dioxide (SiO2)

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

Labradorite (Schiller Spar)

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

Smoky Quartz (Silicon Dioxide (SiO2) with aluminum impurities) — mineral

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

Pyrope Garnet (Magnesium aluminum silicate (Mg3Al2Si3O12)) — mineral

Pyrope Garnet

Magnesium aluminum silicate (Mg3Al2Si3O12)

Star Sapphire (Corundum (Al2O3) with Rutile inclusions) — mineral

Star Sapphire

Corundum (Al2O3) with Rutile inclusions

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

Amethyst

SiO2 (Silicon Dioxide with iron impurities)

Quartz with Inclusions (Silicon Dioxide (SiO2) with various mineral inclusions) — mineral

Quartz with Inclusions

Silicon Dioxide (SiO2) with various mineral inclusions

Quartz Geode Fragment (Silicon Dioxide (SiO2)) — mineral

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Smoky/Milky variant) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky/Milky variant)

Silicon Dioxide (SiO2)

Diamond (Carbon (C)) — mineral

Diamond

Carbon (C)

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

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Quartz with Iron Staining (Silicon Dioxide (SiO2)) — mineral

Quartz with Iron Staining

Silicon Dioxide (SiO2)

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

Lake Superior Agate (Cryptocrystalline Quartz (SiO2)) — mineral

Lake Superior Agate

Cryptocrystalline Quartz (SiO2)

Dendritic Agate (Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide) — mineral

Dendritic Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide

White Quartz (Carved or Tumbled) (Silicon Dioxide (SiO2)) — mineral

White Quartz (Carved or Tumbled)

Silicon Dioxide (SiO2)

Tiger's Eye (SiO2 (Silicon Dioxide) with fibrous crocidolite inclusions) — mineral

Tiger's Eye

SiO2 (Silicon Dioxide) with fibrous crocidolite inclusions

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Amazonite (Microcline (KAlSi3O8) with trace lead (Pb) impurities) — mineral

Amazonite

Microcline (KAlSi3O8) with trace lead (Pb) impurities

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

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

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

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

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Amazonite (KAlSi3O8 (Potassium Aluminum Silicate)) — mineral

Amazonite

KAlSi3O8 (Potassium Aluminum Silicate)