Rock Identifier

Category

Minerals

Browse minerals specimens identified by the Rock Identifier community.

Learn about Minerals in the encyclopedia

Glauconite

Hutcheonite

Halite

Sperrylite

Baddeleyite

Anatase

Brookite

Talc

Euxenite

Eltyubyuite

Buergerite

Dolomite

Vesicular basalt (likely weathered lava rock) (Basalt; chiefly plagioclase, pyroxene, and often olivine) — igneous

Vesicular basalt (likely weathered lava rock)

Basalt; chiefly plagioclase, pyroxene, and often olivine

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

Pink Granite Gneiss

Gneiss (High-grade metamorphic rock)

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

Gossan (Limonite/Ironstone)

Hydrated Iron Oxide (FeO(OH)·nH2O)

Weathered, iron-stained granite (possible granitic gneiss) (Granite, a quartz–feldspar–mica plutonic rock; visual identification is uncertain) — igneous

Weathered, iron-stained granite (possible granitic gneiss)

Granite, a quartz–feldspar–mica plutonic rock; visual identification is uncertain

Green-and-black mottled metamorphic rock (likely serpentinite) (Serpentinite, composed mainly of serpentine-group minerals (e.g., antigorite or lizardite); identification from the photo is provisional.) — metamorphic

Green-and-black mottled metamorphic rock (likely serpentinite)

Serpentinite, composed mainly of serpentine-group minerals (e.g., antigorite or lizardite); identification from the photo is provisional.

Azurite and Malachite on Matrix (Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2CO3(OH)2) — mineral

Azurite and Malachite on Matrix

Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2CO3(OH)2

Azurite-Malachite with Limonite (Cu3(CO3)2(OH)2 (Azurite) / Cu2CO3(OH)2 (Malachite)) — mineral

Azurite-Malachite with Limonite

Cu3(CO3)2(OH)2 (Azurite) / Cu2CO3(OH)2 (Malachite)

Schist (Greenschist / Mica Schist) (Metamorphic rock rich in platy minerals (e.g., Chlorite/Mica schist)) — metamorphic

Schist (Greenschist / Mica Schist)

Metamorphic rock rich in platy minerals (e.g., Chlorite/Mica schist)

Weathered granite or granitic gneiss fragment (Quartz–feldspar–mica granite; possibly foliated granitic gneiss) — igneous

Weathered granite or granitic gneiss fragment

Quartz–feldspar–mica granite; possibly foliated granitic gneiss

Milky quartz (Quartz (silicon dioxide, SiO₂)) — mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

Weathered granitic rock fragment (Granitoid, likely granodiorite or granite) — igneous

Weathered granitic rock fragment

Granitoid, likely granodiorite or granite

Schist (Mica schist, likely muscovite–biotite schist with quartz and feldspar) — metamorphic

Schist

Mica schist, likely muscovite–biotite schist with quartz and feldspar

Limonite Concretion (Goonie or Rattlestone) (Limonite (FeO(OH)·nH2O)) — sedimentary

Limonite Concretion (Goonie or Rattlestone)

Limonite (FeO(OH)·nH2O)

Weathered iron-rich rock, possibly oxidized basalt or laterite (Indeterminate; likely iron-oxide-bearing mafic rock (basaltic composition)) — igneous

Weathered iron-rich rock, possibly oxidized basalt or laterite

Indeterminate; likely iron-oxide-bearing mafic rock (basaltic composition)

Polished granite pebble (Granite; chiefly quartz, feldspar, and mica/amphibole) — igneous

Polished granite pebble

Granite; chiefly quartz, feldspar, and mica/amphibole

Foliated metamorphic rock (likely mica schist) (Mica schist, probably quartz–muscovite/biotite schist; exact identification requires close inspection) — metamorphic

Foliated metamorphic rock (likely mica schist)

Mica schist, probably quartz–muscovite/biotite schist; exact identification requires close inspection

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Gabbro (Gabbro (Mafic Plutonic Rock)) — igneous

Gabbro

Gabbro (Mafic Plutonic Rock)

Gneiss (Metamorphic Rock) (Gneiss) — metamorphic

Gneiss (Metamorphic Rock)

Gneiss

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

Gneiss

Gneiss (High-grade regional metamorphic rock)

Gneiss (specifically a Granitic Gneiss) (Gneiss (Composition: Quartz, Feldspar, Mica)) — metamorphic

Gneiss (specifically a Granitic Gneiss)

Gneiss (Composition: Quartz, Feldspar, Mica)

Tumbled quartz-rich pebble (Quartz, silicon dioxide (SiO₂), likely milky or included quartz) — mineral

Tumbled quartz-rich pebble

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

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Massive Quartz (Silicon dioxide (SiO2)) — mineral

Massive Quartz

Silicon dioxide (SiO2)

Malachite (Copper Carbonate Hydroxide, Cu2CO3(OH)2) — mineral

Malachite

Copper Carbonate Hydroxide, Cu2CO3(OH)2

Gneiss (Quartz–feldspar–mica gneiss) — metamorphic

Gneiss

Quartz–feldspar–mica gneiss

Granite (Granite, a coarse-grained intrusive felsic igneous rock composed chiefly of quartz and feldspar) — igneous

Granite

Granite, a coarse-grained intrusive felsic igneous rock composed chiefly of quartz and feldspar

Orbicular granite (likely Rapakivi-type granite) (Granite, chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende) — igneous

Orbicular granite (likely Rapakivi-type granite)

Granite, chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende

Gneissic Granite (Granite Gneiss) — metamorphic

Gneissic Granite

Granite Gneiss

Weathered schist (Mica schist, likely chlorite–biotite schist) — metamorphic

Weathered schist

Mica schist, likely chlorite–biotite schist

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Banded Gneiss (Gneiss (High-grade Metamorphic Rock)) — metamorphic

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

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)

Polished granite countertop with fossil shell (Granite; shell likely a fossilized bivalve or gastropod) — igneous

Polished granite countertop with fossil shell

Granite; shell likely a fossilized bivalve or gastropod

K-Feldspar / Granite Fragment (Potassium Feldspar (Microcline/Orthoclase) with Quartz) — igneous

K-Feldspar / Granite Fragment

Potassium Feldspar (Microcline/Orthoclase) with Quartz

Gold Ore (Native Gold (Au) in Quartz or Silicate matrix) — mineral

Gold Ore

Native Gold (Au) in Quartz or Silicate matrix

Weathered granite boulder (Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica) — igneous

Weathered granite boulder

Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica

Limonite (FeO(OH)·nH2O) — mineral

Limonite

FeO(OH)·nH2O

Limonite (FeO(OH)·nH2O) — mineral

Limonite

FeO(OH)·nH2O

Limonite (FeO(OH)·nH2O) — mineral

Limonite

FeO(OH)·nH2O

Limonite (FeO(OH)•nH2O) — mineral

Limonite

FeO(OH)•nH2O

Limonite (FeO(OH)·nH2O) — mineral

Limonite

FeO(OH)·nH2O