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

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

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Garnet (Garnet Group (e.g., Almandine, Pyrope)) — mineral

Garnet

Garnet Group (e.g., Almandine, Pyrope)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Celestite (Blue Celestine) (Celestine (Strontium Sulfate, SrSO4)) — mineral

Celestite (Blue Celestine)

Celestine (Strontium Sulfate, SrSO4)

Pegmatite (Granitic Pegmatite with Quartz and Feldspar) (Intrusive Igneous Rock (Granitic Pegmatite)) — igneous

Pegmatite (Granitic Pegmatite with Quartz and Feldspar)

Intrusive Igneous Rock (Granitic Pegmatite)

Druzy Quartz on Host Rock (Silicon Dioxide (SiO2) with various iron-oxide inclusions) — mineral

Druzy Quartz on Host Rock

Silicon Dioxide (SiO2) with various iron-oxide inclusions

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Milky Quartz Pebble (Beach Agate / Quartz) (Silicon Dioxide (SiO2)) — mineral

Milky Quartz Pebble (Beach Agate / Quartz)

Silicon Dioxide (SiO2)

Soapstone / Steatite (Steatite (primarily Talc, Mg3Si4O10(OH)2)) — metamorphic

Soapstone / Steatite

Steatite (primarily Talc, Mg3Si4O10(OH)2)

Chrysocolla on Quartz with Iron Oxides (Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)) — mineral

Chrysocolla on Quartz with Iron Oxides

Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)

Celestine (Celestite) (Strontium sulfate (SrSO4)) — mineral

Celestine (Celestite)

Strontium sulfate (SrSO4)

Epidote (Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)) — mineral

Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

Vesicular quartz-rich rock, possibly weathered rhyolite or silicified volcanic breccia (Silica-rich volcanic rock; likely microcrystalline quartz (SiO₂) with altered feldspar and iron-oxide staining) — igneous

Vesicular quartz-rich rock, possibly weathered rhyolite or silicified volcanic breccia

Silica-rich volcanic rock; likely microcrystalline quartz (SiO₂) with altered feldspar and iron-oxide staining

Weathered basalt or iron-rich river cobble (Basalt, likely with iron-oxide staining; exact identification requires testing) — igneous

Weathered basalt or iron-rich river cobble

Basalt, likely with iron-oxide staining; exact identification requires testing

Quartz Geode (Cracked) (Quartz (Silicon Dioxide, SiO2)) — sedimentary

Quartz Geode (Cracked)

Quartz (Silicon Dioxide, SiO2)

Gold-bearing Quartz (Auriferous Quartz (SiO2 with Native Gold inclusion)) — mineral

Gold-bearing Quartz

Auriferous Quartz (SiO2 with Native Gold inclusion)

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

Garnet

Almandine (Fe3Al2(SiO4)3)

Banded calcite (travertine/cave calcite) (Calcite, CaCO₃; likely banded carbonate travertine or flowstone) — mineral

Banded calcite (travertine/cave calcite)

Calcite, CaCO₃; likely banded carbonate travertine or flowstone

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Fuchsite (Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)) — mineral

Fuchsite

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

Pyrite (Fool's Gold) (Iron Disulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Botryoidal Malachite (Malachite - Cu2CO3(OH)2) — mineral

Botryoidal Malachite

Malachite - Cu2CO3(OH)2

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

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

Sodalite (Na8(Al6Si6O24)Cl2 (Sodium Aluminum Silicate Chloride)) — mineral

Sodalite

Na8(Al6Si6O24)Cl2 (Sodium Aluminum Silicate Chloride)

Fossiliferous Chert Nodule (SiO2 (Microcrystalline Quartz) with fossil inclusions) — fossil

Fossiliferous Chert Nodule

SiO2 (Microcrystalline Quartz) with fossil inclusions

Botryoidal Chalcedony (Agate/Chert Nodule) (Chalcedony (SiO2)) — mineral

Botryoidal Chalcedony (Agate/Chert Nodule)

Chalcedony (SiO2)

Arsenopyrite (Arsenopyrite (FeAsS)) — mineral

Arsenopyrite

Arsenopyrite (FeAsS)

Amazonite (Potassium Feldspar (Microcline) - K(AlSi3O8)) — Mineral

Amazonite

Potassium Feldspar (Microcline) - K(AlSi3O8)

Pink Garnet in Matrix (Grossular or Almandine Garnet (X3Y2(SiO4)3)) — metamorphic

Pink Garnet in Matrix

Grossular or Almandine Garnet (X3Y2(SiO4)3)

Quartz (Milky/Gold-stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Gold-stained)

Silicon Dioxide (SiO2)

Blue Calcite (Calcium Carbonate (CaCO3)) — mineral

Blue Calcite

Calcium Carbonate (CaCO3)

Fire Agate (Rough) (Silicon Dioxide (SiO2) - Variety of Chalcedony) — mineral

Fire Agate (Rough)

Silicon Dioxide (SiO2) - Variety of Chalcedony

Charoite (Charoite (Hydrated potassium sodium calcium barium strontium silicate hydroxyfluoride)) — metamorphic

Charoite

Charoite (Hydrated potassium sodium calcium barium strontium silicate hydroxyfluoride)

Aragonite Star Cluster (Cross-section) (Aragonite (Calcium Carbonate, CaCO3)) — mineral

Aragonite Star Cluster (Cross-section)

Aragonite (Calcium Carbonate, CaCO3)

Halite (Rock Salt) (Halite (Sodium Chloride, NaCl)) — mineral

Halite (Rock Salt)

Halite (Sodium Chloride, NaCl)

Native Copper (Native Copper (Cu)) — mineral

Native Copper

Native Copper (Cu)

Granite (Phaneritic plutonic rock (Quartz, Feldspar, Mica)) — igneous

Granite

Phaneritic plutonic rock (Quartz, Feldspar, Mica)

Rhodochrosite (Manganese Carbonate (MnCO3)) — mineral

Rhodochrosite

Manganese Carbonate (MnCO3)

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

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

Almandine Garnet (weathered)

Almandine (Fe3Al2(SiO4)3)

Metallic sulfide mineral fragment, likely bornite or chalcopyrite (Bornite (Cu₅FeS₄) or chalcopyrite (CuFeS₂)) — mineral

Metallic sulfide mineral fragment, likely bornite or chalcopyrite

Bornite (Cu₅FeS₄) or chalcopyrite (CuFeS₂)

Mica Schist with Pyrite and Quartz (Metamorphic Rock (Muscovite-Biotite Schist)) — metamorphic

Mica Schist with Pyrite and Quartz

Metamorphic Rock (Muscovite-Biotite Schist)