Rock Identifier

Category

Mineral (Silicate Variety)

Browse mineral (silicate variety) specimens identified by the Rock Identifier community.

Learn about Mineral (Silicate Variety) in the encyclopedia

Calc-Silicate Rock

Calc-Silicate Rock

Brookite

Talc

Eltyubyuite

Paracelsian

Banalsite

Sodalite

Albite

Hemimorphite

Mica

Shattuckite

Skarn

Quartz with Mica (Muscovite/Biotite) (Silicon Dioxide (SiO2) with Phyllosilicate inclusions) — mineral

Quartz with Mica (Muscovite/Biotite)

Silicon Dioxide (SiO2) with Phyllosilicate inclusions

Mica Schist / Granite (Mica Schist (Silicate metamorphic rock)) — metamorphic

Mica Schist / Granite

Mica Schist (Silicate metamorphic rock)

Felted Quartz / Chlorite Quartz (Chlorite included Quartz (SiO2 + (Mg,Fe)3(Si,Al)2O5(OH)4)) — mineral

Felted Quartz / Chlorite Quartz

Chlorite included Quartz (SiO2 + (Mg,Fe)3(Si,Al)2O5(OH)4)

Weathered iron-rich rock, possibly limonite-bearing quartzite or altered basalt (Indeterminate; likely quartz (SiO₂) with iron oxides/hydroxides such as limonite/goethite) — mineral

Weathered iron-rich rock, possibly limonite-bearing quartzite or altered basalt

Indeterminate; likely quartz (SiO₂) with iron oxides/hydroxides such as limonite/goethite

Green Aventurine (SiO2 (Quartz with Fuchsite inclusions)) — mineral

Green Aventurine

SiO2 (Quartz with Fuchsite inclusions)

Orthoclase (Potassium) Feldspar in Quartz (KAlSi3O8 (Potassium Aluminum Silicate)) — igneous

Orthoclase (Potassium) Feldspar in Quartz

KAlSi3O8 (Potassium Aluminum Silicate)

Eclogite (Eclogite (Omphacite-Garnet rock)) — metamorphic

Eclogite

Eclogite (Omphacite-Garnet rock)

Blue Topaz (Al2SiO4(F,OH)2) — mineral

Blue Topaz

Al2SiO4(F,OH)2

Leopard Skin Jasper (Silicon Dioxide (SiO2) with iron and manganese inclusions) — sedimentary

Leopard Skin Jasper

Silicon Dioxide (SiO2) with iron and manganese inclusions

Mixed Gemstone and Mineral Collection (Mixed Silica and Carbonate minerals (SiO2, CaSO4·2H2O, etc.)) — mineral

Mixed Gemstone and Mineral Collection

Mixed Silica and Carbonate minerals (SiO2, CaSO4·2H2O, etc.)

Bauxite (Bauxite (Al(OH)3, AlO(OH))) — sedimentary

Bauxite

Bauxite (Al(OH)3, AlO(OH))

Peach Moonstone (Potassium Aluminum Silicate (KAlSi3O8) with inclusions) — mineral

Peach Moonstone

Potassium Aluminum Silicate (KAlSi3O8) with inclusions

Bauxite (Bauxite (Al(OH)3, AlO(OH))) — sedimentary

Bauxite

Bauxite (Al(OH)3, AlO(OH))

Copper-stained rounded stone (Likely copper-bearing chrysocolla or azurite/malachite coating on a silicate host; exact identification requires testing) — mineral

Copper-stained rounded stone

Likely copper-bearing chrysocolla or azurite/malachite coating on a silicate host; exact identification requires testing

Limonite (Iron Ore) (Limonite (unstructured hydrated iron(III) oxide-hydroxides, often FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore)

Limonite (unstructured hydrated iron(III) oxide-hydroxides, often FeO(OH)·nH2O)

Blue Topaz (Cut Gemstone) (Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)) — gemstone

Blue Topaz (Cut Gemstone)

Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)

Tree Agate (Silicon Dioxide (SiO2) with Chlorite inclusions) — mineral

Tree Agate

Silicon Dioxide (SiO2) with Chlorite inclusions

Gneiss (specifically a weathered Amphibolite or Garnet Gneiss) (Gneiss (complex silicate composition)) — metamorphic

Gneiss (specifically a weathered Amphibolite or Garnet Gneiss)

Gneiss (complex silicate composition)

Yellow calcite fragment (Calcite (CaCO₃), likely honey/yellow calcite) — mineral

Yellow calcite fragment

Calcite (CaCO₃), likely honey/yellow calcite

Light-colored quartz-rich stone, possibly milky quartz (Quartz (SiO₂), provisional identification) — mineral

Light-colored quartz-rich stone, possibly milky quartz

Quartz (SiO₂), provisional identification

Black Tourmaline (Schorl) (Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)) — mineral

Black Tourmaline (Schorl)

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Amethyst (Tumbled) (Silicon Dioxide (Quartz) with traces of Iron; SiO2) — mineral

Amethyst (Tumbled)

Silicon Dioxide (Quartz) with traces of Iron; SiO2

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Granite (Felsic intrusive igneous rock) — igneous

Granite

Felsic intrusive igneous rock

Quartz–feldspar–mica metamorphic rock, likely gneiss (Gneiss; composition commonly quartz (SiO₂), feldspars, biotite/hornblende, and minor accessory minerals) — metamorphic

Quartz–feldspar–mica metamorphic rock, likely gneiss

Gneiss; composition commonly quartz (SiO₂), feldspars, biotite/hornblende, and minor accessory minerals

Tektite (Natural impact glass) — meteorite

Tektite

Natural impact glass

Labradorite (Labradorite (a calcium-enriched sodic plagioclase feldspar)) — mineral

Labradorite

Labradorite (a calcium-enriched sodic plagioclase feldspar)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Unidentified gray-brown stone (Likely fine-grained quartz–feldspar rock; exact identification is not possible from this close, blurred image) — mineral

Unidentified gray-brown stone

Likely fine-grained quartz–feldspar rock; exact identification is not possible from this close, blurred image

Biotite (Mica) (Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2) — mineral

Biotite (Mica)

Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2

Smoky Quartz occurring with Feldspar (Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)) — mineral

Smoky Quartz occurring with Feldspar

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)

Gastropod Fossil (Class Gastropoda (fossilized)) — fossil

Gastropod Fossil

Class Gastropoda (fossilized)

Dalmatian Stone (Dalmatian Stone (formerly called Dalmatian Jasper)) — igneous

Dalmatian Stone

Dalmatian Stone (formerly called Dalmatian Jasper)

Kaolin (China Clay) (Kaolinite [Al2Si2O5(OH)4]) — sedimentary

Kaolin (China Clay)

Kaolinite [Al2Si2O5(OH)4]

Unidentified gray mineral/rock fragment (Indeterminate from image; possibly quartz-rich material or mica-bearing schist) — mineral

Unidentified gray mineral/rock fragment

Indeterminate from image; possibly quartz-rich material or mica-bearing schist

Likely gray granite or granitic rock fragment (Granite; primarily quartz, feldspar, and mica) — igneous

Likely gray granite or granitic rock fragment

Granite; primarily quartz, feldspar, and mica

Sandstone with Ironstone Concretion (Arenite with Ferruginous Cement) — sedimentary

Sandstone with Ironstone Concretion

Arenite with Ferruginous Cement

Serpentinite (Serpentinite (Hydrated Magnesium Silicate Mg3Si2O5(OH)4)) — metamorphic

Serpentinite

Serpentinite (Hydrated Magnesium Silicate Mg3Si2O5(OH)4)

Mixed River Pebbles (Jasper, Hematite, and Quartzites) (Silicon dioxide (Jasper/Quartz) and Iron oxide (Hematite)) — sedimentary

Mixed River Pebbles (Jasper, Hematite, and Quartzites)

Silicon dioxide (Jasper/Quartz) and Iron oxide (Hematite)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Granite (Phaneritic Felsic Igneous Rock) — igneous

Granite

Phaneritic Felsic Igneous Rock

Green Calcite (Calcium Carbonate (CaCO3)) — mineral

Green Calcite

Calcium Carbonate (CaCO3)