Rock Identifier

Category

Mineral Specimen

Browse mineral specimen specimens identified by the Rock Identifier community.

Learn about Mineral Specimen in the encyclopedia

Emerald in Matrix

Emerald in Matrix

Aquamarine Matrix

Aquamarine Matrix

Morganite Crystal

Morganite Crystal

Emerald Crystal

Emerald Crystal

Aquamarine Crystal

Aquamarine Crystal

Mushroom Tourmaline

Mushroom Tourmaline

Glauconite

Hutcheonite

Halite

Sperrylite

Baddeleyite

Anatase

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

Garnet (Almandine)

Almandine Fe3Al2(SiO4)3

Prehnite (Prehnite (Ca2Al2Si3O10(OH)2)) — mineral

Prehnite

Prehnite (Ca2Al2Si3O10(OH)2)

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

Garnet

Almandine Garnet (Fe3Al2(SiO4)3)

Citrine Quartz (Silicon Dioxide (SiO2)) — mineral

Citrine Quartz

Silicon Dioxide (SiO2)

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

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Tumbled granite or granitic gneiss (Granite: quartz, feldspar, and mica; possibly foliated gneiss) — igneous

Tumbled granite or granitic gneiss

Granite: quartz, feldspar, and mica; possibly foliated gneiss

Quartz Geode (Silicon Dioxide (SiO2) in a sedimentary host) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2) in a sedimentary host

Epidote (Epidote (Ca2(Al, Fe)3(SiO4)3(OH))) — mineral

Epidote

Epidote (Ca2(Al, Fe)3(SiO4)3(OH))

Pink granite or granitic pegmatite (Granite; chiefly quartz (SiO₂), potassium feldspar, plagioclase, and minor biotite/amphibole) — igneous

Pink granite or granitic pegmatite

Granite; chiefly quartz (SiO₂), potassium feldspar, plagioclase, and minor biotite/amphibole

Rose quartz (Quartz, silicon dioxide (SiO₂), pink massive variety) — mineral

Rose quartz

Quartz, silicon dioxide (SiO₂), pink massive variety

Specular Hematite (Hematite (Fe2O3)) — mineral

Specular Hematite

Hematite (Fe2O3)

Quartz geode / druzy quartz (Quartz (SiO₂), likely a small chalcedony-lined geode with drusy quartz crystals) — mineral

Quartz geode / druzy quartz

Quartz (SiO₂), likely a small chalcedony-lined geode with drusy quartz crystals

Likely quartz crystal fragment (Quartz (SiO₂), possibly a small tumbled or cleaved fragment) — mineral

Likely quartz crystal fragment

Quartz (SiO₂), possibly a small tumbled or cleaved fragment

Ferruginous Quartz / Iron-Stained Quartz (Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)) — mineral

Ferruginous Quartz / Iron-Stained Quartz

Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)

Desert Rose (Gypsum rosette (CaSO4·2H2O) or Barite rosette (BaSO4)) — mineral

Desert Rose

Gypsum rosette (CaSO4·2H2O) or Barite rosette (BaSO4)

Quartz Geode (partially formed) (Silicon Dioxide (SiO2)) — mineral

Quartz Geode (partially formed)

Silicon Dioxide (SiO2)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

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

Amethyst

Silicon dioxide with iron impurities (SiO2)

Prehnite (Ca2Al(AlSi3O10)(OH)2) — mineral

Prehnite

Ca2Al(AlSi3O10)(OH)2

Limonite (Iron Ore) (FeO(OH)·nH2O) — mineral

Limonite (Iron Ore)

FeO(OH)·nH2O

Prehnite (Prehnite, Ca2Al(AlSi3O10)(OH)2) — mineral

Prehnite

Prehnite, Ca2Al(AlSi3O10)(OH)2

Weathered quartz-rich rock, possibly quartzite or iron-stained quartz (Quartz (SiO₂), likely in a quartzite matrix with iron-oxide staining) — metamorphic

Weathered quartz-rich rock, possibly quartzite or iron-stained quartz

Quartz (SiO₂), likely in a quartzite matrix with iron-oxide staining

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

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Black tourmaline (polished schorl) (Schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄) — mineral

Black tourmaline (polished schorl)

Schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Rose quartz (likely) (Quartz, silicon dioxide (SiO₂), pink variety) — mineral

Rose quartz (likely)

Quartz, silicon dioxide (SiO₂), pink variety

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

Rough Amethyst Quartz

Silicon Dioxide with Iron impurities (SiO2)

Gold-bearing Quartz (Lode Gold in Silicon Dioxide (SiO2)) — mineral

Gold-bearing Quartz

Lode Gold in Silicon Dioxide (SiO2)

Amethyst (Silicon Dioxide (SiO2) with traces of Iron (Fe3+)) — mineral

Amethyst

Silicon Dioxide (SiO2) with traces of Iron (Fe3+)

Gold-bearing Quartz and Pyrite (Auriferous Quartz (SiO2 + Au) with Pyrite (FeS2)) — mineral

Gold-bearing Quartz and Pyrite

Auriferous Quartz (SiO2 + Au) with Pyrite (FeS2)

Green fluorite crystal (Fluorite (calcium fluoride, CaF₂)) — mineral

Green fluorite crystal

Fluorite (calcium fluoride, CaF₂)

Prehnite (Prehnite (Ca2Al2Si3O10(OH)2)) — mineral

Prehnite

Prehnite (Ca2Al2Si3O10(OH)2)

Blue Apatite (Fluorapatite (Ca5(PO4)3F)) — mineral

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Raw Calcite (Calcite (Calcium Carbonate - CaCO3)) — mineral

Raw Calcite

Calcite (Calcium Carbonate - CaCO3)

Limonite Geode / Ironstone Concretion (Hydrated Iron Oxide (FeO(OH)·nH2O)) — sedimentary

Limonite Geode / Ironstone Concretion

Hydrated Iron Oxide (FeO(OH)·nH2O)

Honey calcite crystal cluster (Calcite (CaCO₃)) — mineral

Honey calcite crystal cluster

Calcite (CaCO₃)

Botryoidal chalcedony (white agate) (Microcrystalline quartz, SiO₂ (chalcedony)) — mineral

Botryoidal chalcedony (white agate)

Microcrystalline quartz, SiO₂ (chalcedony)

Amethyst crystal cluster (Quartz (SiO₂), purple variety colored mainly by iron-related defects and irradiation) — gemstone

Amethyst crystal cluster

Quartz (SiO₂), purple variety colored mainly by iron-related defects and irradiation

Quartz with Schorl (Black Tourmaline) (Silicon Dioxide (SiO2) with Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)) — mineral

Quartz with Schorl (Black Tourmaline)

Silicon Dioxide (SiO2) with Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)

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

Emerald in Matrix

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Pyrite Nodules / Weathered Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite Nodules / Weathered Pyrite

Iron Sulfide (FeS2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)