Rock Identifier

Category

Mineral

Browse mineral specimens identified by the Rock Identifier community.

Learn about Mineral in the encyclopedia

Acanthite

Adirondack Garnet

Adirondack Garnet

Adularia

Agate

Albite

Alkali Feldspar

Alkali Feldspar

Amazonite

Anatase

Andalusite

Angelite

Anglesite

Anhydrite

Granite (Granite) — Igneous

Granite

Granite

Gneiss (Gneiss (High-grade metamorphic rock)) — metamorphic

Gneiss

Gneiss (High-grade metamorphic rock)

Granite (Granite (composed of Quartz, Feldspar, and Mica)) — igneous

Granite

Granite (composed of Quartz, Feldspar, and Mica)

Magnetite (Lodestone) (Iron(II,III) oxide (Fe3O4)) — mineral

Magnetite (Lodestone)

Iron(II,III) oxide (Fe3O4)

Marble (Recrystallized Calcite (CaCO3)) — metamorphic

Marble

Recrystallized Calcite (CaCO3)

Likely weathered granite or granitic gneiss (Quartz–feldspar–mica rock; possibly gneissic granite) — igneous

Likely weathered granite or granitic gneiss

Quartz–feldspar–mica rock; possibly gneissic granite

Ruby (Raw Corundum) (Al2O3 (Aluminum Oxide)) — mineral

Ruby (Raw Corundum)

Al2O3 (Aluminum Oxide)

Schist (Schist (various mineralogical compositions including mica, chlorite, talc, etc.)) — Metamorphic

Schist

Schist (various mineralogical compositions including mica, chlorite, talc, etc.)

Banded Gneiss (Variety of Gneiss) (Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)) — Metamorphic Rock

Banded Gneiss (Variety of Gneiss)

Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)

Metamorphic Rock

Magnetite (Fe3O4 (Iron(II,III) oxide)) — mineral

Magnetite

Fe3O4 (Iron(II,III) oxide)

Basalt with an orange mineral vein (Fine-grained basalt, likely containing iron-stained calcite or zeolite; exact identification requires testing) — igneous

Basalt with an orange mineral vein

Fine-grained basalt, likely containing iron-stained calcite or zeolite; exact identification requires testing

Fossilized Gastropod / Coral (Phylum Mollusca / Cnidaria (Silicified or Calcified)) — fossil

Fossilized Gastropod / Coral

Phylum Mollusca / Cnidaria (Silicified or Calcified)

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

Apatite

Fluorapatite (Ca5(PO4)3F)

Quartz in Limonite-rich Matrix (Silicon Dioxide (SiO2) with Goethite/Limonite FeO(OH)·nH2O) — Mineral in Sedimentary/Secondary host

Quartz in Limonite-rich Matrix

Silicon Dioxide (SiO2) with Goethite/Limonite FeO(OH)·nH2O

Mineral in Sedimentary/Secondary host

Rhodochrosite (Manganese Carbonate (MnCO3)) — mineral

Rhodochrosite

Manganese Carbonate (MnCO3)

Fluorite (Fluor-spar) (Calcium Fluoride (CaF2)) — mineral

Fluorite (Fluor-spar)

Calcium Fluoride (CaF2)

Fluorite with Quartz (Fluorite (CaF2) and Quartz (SiO2)) — mineral

Fluorite with Quartz

Fluorite (CaF2) and Quartz (SiO2)

Sandstone (Sandstone (composed primarily of sand-sized minerals or rock grains)) — sedimentary

Sandstone

Sandstone (composed primarily of sand-sized minerals or rock grains)

Microcline Feldspar (Amazonite or White Feldspar) (KAlSi3O8) — mineral

Microcline Feldspar (Amazonite or White Feldspar)

KAlSi3O8

Quartz crystal cluster (Quartz (silicon dioxide, SiO₂), likely milky or druzy quartz) — mineral

Quartz crystal cluster

Quartz (silicon dioxide, SiO₂), likely milky or druzy quartz

Fluorite (Calcium fluoride (CaF2)) — mineral

Fluorite

Calcium fluoride (CaF2)

Bornite (Bornite (Cu5FeS4)) — mineral

Bornite

Bornite (Cu5FeS4)

Chalcopyrite (Copper Iron Sulfide (CuFeS2)) — mineral

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Pyrite with Quartz (Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)) — mineral

Pyrite with Quartz

Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)

Quartz with Mineral Inclusions (Silicon Dioxide (SiO2)) — mineral

Quartz with Mineral Inclusions

Silicon Dioxide (SiO2)

Granite pebble (Granite; predominantly quartz, feldspar, and mica) — igneous

Granite pebble

Granite; predominantly quartz, feldspar, and mica

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Limonite (FeO(OH)·nH2O) — mineral

Limonite

FeO(OH)·nH2O

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Mica Schist or Muscovite (KAl2(AlSi3O10)(OH)2) — metamorphic

Mica Schist or Muscovite

KAl2(AlSi3O10)(OH)2

Limonite with Gossan / Iron Ore (Hydrated iron oxide-hydroxide, approximately FeO(OH)·nH2O) — mineral

Limonite with Gossan / Iron Ore

Hydrated iron oxide-hydroxide, approximately FeO(OH)·nH2O

Graphite (Graphite (Carbon, C)) — mineral

Graphite

Graphite (Carbon, C)

Muscovite Mica (Muscovite (KAl2(AlSi3O10)(F,OH)2)) — mineral

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(F,OH)2)

Specular Hematite (Hematite (Fe2O3)) — mineral

Specular Hematite

Hematite (Fe2O3)

Ironstone / Hematite (Iron(III) oxide (Fe2O3)) — mineral

Ironstone / Hematite

Iron(III) oxide (Fe2O3)

Celestite (Celestine (SrSO4)) — mineral

Celestite

Celestine (SrSO4)

Graphite (Graphite (Carbon, C)) — mineral

Graphite

Graphite (Carbon, C)

Galena with Pyrite (Lead Sulfide (PbS) associated with Iron Sulfide (FeS2)) — mineral

Galena with Pyrite

Lead Sulfide (PbS) associated with Iron Sulfide (FeS2)

Feldspar (Triclinic or Monoclinic Tectosilicate (e.g., KAlSi3O8)) — mineral

Feldspar

Triclinic or Monoclinic Tectosilicate (e.g., KAlSi3O8)

Chalcopyrite (CuFeS2) — mineral

Chalcopyrite

CuFeS2

Hematite (Hematite (Fe2O3)) — mineral

Hematite

Hematite (Fe2O3)

Muscovite (KAl2(AlSi3O10)(OH)2) — mineral

Muscovite

KAl2(AlSi3O10)(OH)2