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

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Tumbled Amethyst (Quartz (Silicon Dioxide, SiO2)) — gemstone

Tumbled Amethyst

Quartz (Silicon Dioxide, SiO2)

Tiger Iron (Composite rock (Quartz, Tiger's Eye, Hematite, and Jasper)) — metamorphic

Tiger Iron

Composite rock (Quartz, Tiger's Eye, Hematite, and Jasper)

Heliotrope (Bloodstone) (Chalcedony quartz variety (SiO2) with hematite or jasper inclusions) — mineral

Heliotrope (Bloodstone)

Chalcedony quartz variety (SiO2) with hematite or jasper inclusions

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

Epidote

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

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Citrine Quartz (Silicon Dioxide (SiO2) with iron impurities) — mineral

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Almandine Garnet in Matrix (Almandine, Fe3Al2(SiO4)3) — metamorphic

Almandine Garnet in Matrix

Almandine, Fe3Al2(SiO4)3

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

Citrine

Silicon Dioxide (SiO2) with iron impurities

Amethyst (Chevron Amethyst/Dream Amethyst) (Silicon Dioxide (SiO2) with trace Iron impurities) — mineral

Amethyst (Chevron Amethyst/Dream Amethyst)

Silicon Dioxide (SiO2) with trace Iron impurities

Azurite and Malachite (Copper Carbonates: Cu3(CO3)2(OH)2 (Azurite) and Cu2CO3(OH)2 (Malachite)) — mineral

Azurite and Malachite

Copper Carbonates: Cu3(CO3)2(OH)2 (Azurite) and Cu2CO3(OH)2 (Malachite)

Calcite on Host Rock (Calcium Carbonate (CaCO3)) — mineral

Calcite on Host Rock

Calcium Carbonate (CaCO3)

Raw Calcite (Calcium Carbonate (CaCO3)) — mineral

Raw Calcite

Calcium Carbonate (CaCO3)

Copper Ore (Malachite/Chrysocolla bearing) (Cupriferous rock containing secondary copper minerals like Cu2CO3(OH)2) — mineral

Copper Ore (Malachite/Chrysocolla bearing)

Cupriferous rock containing secondary copper minerals like Cu2CO3(OH)2

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Small weathered mineral/rock fragment (Uncertain from image; possibly quartz-rich sandstone or a feldspar-bearing rock) — mineral

Small weathered mineral/rock fragment

Uncertain from image; possibly quartz-rich sandstone or a feldspar-bearing rock

Amethyst (Quartz (Silicon Dioxide, SiO2)) — gemstone

Amethyst

Quartz (Silicon Dioxide, SiO2)

Limonite Pseudomorph after Pyrite (Limonite (Hydrous iron oxides e.g., FeO(OH)·nH2O) pseudomorphing Pyrite (FeS2)) — mineral

Limonite Pseudomorph after Pyrite

Limonite (Hydrous iron oxides e.g., FeO(OH)·nH2O) pseudomorphing Pyrite (FeS2)

Tumbled quartz-rich pebble (likely quartzite or vein quartz) (Quartz (SiO₂), possibly quartzite with minor iron-oxide staining) — metamorphic

Tumbled quartz-rich pebble (likely quartzite or vein quartz)

Quartz (SiO₂), possibly quartzite with minor iron-oxide staining

Small dark mineral or rock fragment (Indeterminate; possibly mica-rich schist, biotite, or a dark sulfide mineral) — mineral

Small dark mineral or rock fragment

Indeterminate; possibly mica-rich schist, biotite, or a dark sulfide mineral

Iron (Hematite variety) (Iron (Fe) / Hematite (Fe2O3)) — mineral

Iron (Hematite variety)

Iron (Fe) / Hematite (Fe2O3)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Quartz with Spessartine Garnet and Biotite (SiO2 (Quartz) with Mn3Al2(SiO4)3 (Spessartine)) — mineral

Quartz with Spessartine Garnet and Biotite

SiO2 (Quartz) with Mn3Al2(SiO4)3 (Spessartine)

Copper slag or vesicular basalt with copper minerals (Industrial slag / Basaltic matrix with secondary copper minerals) — igneous

Copper slag or vesicular basalt with copper minerals

Industrial slag / Basaltic matrix with secondary copper minerals

Herkimer Diamond (Double-terminated Quartz (Silicon Dioxide, SiO2)) — mineral

Herkimer Diamond

Double-terminated Quartz (Silicon Dioxide, SiO2)

Quartzite Cobble / Quartz River Pebble (Silicon Dioxide (SiO2) - Quartzite / Quartz) — metamorphic

Quartzite Cobble / Quartz River Pebble

Silicon Dioxide (SiO2) - Quartzite / Quartz

Paraiba Tourmaline (Elbaite Tourmaline (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4) - Copper-bearing) — mineral

Paraiba Tourmaline

Elbaite Tourmaline (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4) - Copper-bearing

Possible weathered metal-rich rock or slag fragment (Uncertain; possibly iron-oxide-rich breccia or industrial slag) — mineral

Possible weathered metal-rich rock or slag fragment

Uncertain; possibly iron-oxide-rich breccia or industrial slag

Weathered quartz-rich pebble (probable quartzite or quartz vein material) (Quartzite, predominantly SiO₂ (identification provisional)) — metamorphic

Weathered quartz-rich pebble (probable quartzite or quartz vein material)

Quartzite, predominantly SiO₂ (identification provisional)

Citrine (Silicon Dioxide (Quartz variety), SiO2) — mineral

Citrine

Silicon Dioxide (Quartz variety), SiO2

Potassium Feldspar (Microcline) (KAlSi3O8) — mineral

Potassium Feldspar (Microcline)

KAlSi3O8

Glaucophane Schist (Blueschist) (Blueschist (Glaucophane-bearing schist)) — metamorphic

Glaucophane Schist (Blueschist)

Blueschist (Glaucophane-bearing schist)

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

Smoky Quartz with Milky Quartz

Silicon Dioxide (SiO2)

Native Copper (Native Copper (Cu)) — mineral

Native Copper

Native Copper (Cu)

Milky Quartz Geode / Chalcedony Nodule (Quartz (Silicon Dioxide - SiO2)) — mineral

Milky Quartz Geode / Chalcedony Nodule

Quartz (Silicon Dioxide - SiO2)

Petrified Coral (Agatized Coral) (Fossilized Anthozoa (Silicon Dioxide replacement - SiO2)) — fossil

Petrified Coral (Agatized Coral)

Fossilized Anthozoa (Silicon Dioxide replacement - SiO2)

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

Auriferous Quartz with Pyrite

Gold-bearing Quartz (SiO2 + FeS2 + Au)

Beryl (likely Aquamarine or Heliodor variant) (Beryllium aluminum cyclosilicate (Be3Al2Si6O18)) — mineral

Beryl (likely Aquamarine or Heliodor variant)

Beryllium aluminum cyclosilicate (Be3Al2Si6O18)

Granite (Granite (Felsic intrusive igneous rock)) — igneous

Granite

Granite (Felsic intrusive igneous rock)

Pegmatite (Granitic) (Granitic Pegmatite) — igneous

Pegmatite (Granitic)

Granitic Pegmatite

Serpentinite (Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4) — metamorphic

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Amazonite (Potassium Feldspar (KAlSi3O8)) — Mineral

Amazonite

Potassium Feldspar (KAlSi3O8)