Rock Identifier

Category

Mineralogical Specimen

Browse mineralogical specimen specimens identified by the Rock Identifier community.

Learn about Mineralogical Specimen in the encyclopedia

Emerald in Matrix

Emerald in Matrix

Morganite Crystal

Morganite Crystal

Aquamarine Matrix

Aquamarine Matrix

Emerald Crystal

Emerald Crystal

Aquamarine Crystal

Aquamarine Crystal

Mushroom Tourmaline

Mushroom Tourmaline

White Beryl

Smoky Quartz

Clear Obsidian

Goshenite Crystal

Goshenite Crystal

Magnetite

Crocoite

Pyrite (fool’s gold) (Pyrite, FeS₂) — mineral

Pyrite (fool’s gold)

Pyrite, FeS₂

Milky Quartz Vein in Host Rock (Silicon Dioxide (SiO2)) — mineral

Milky Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

River Stone (possibly Gneiss) (Metamorphic Gneiss) — metamorphic

River Stone (possibly Gneiss)

Metamorphic Gneiss

River Quartz Pitting/Cobble (Silicon Dioxide (SiO2)) — mineral

River Quartz Pitting/Cobble

Silicon Dioxide (SiO2)

Granite pebble (Granite; chiefly quartz, alkali feldspar, plagioclase, and mica) — igneous

Granite pebble

Granite; chiefly quartz, alkali feldspar, plagioclase, and mica

Dark mafic metamorphic rock, likely amphibolite (Amphibolite; chiefly hornblende amphibole and plagioclase feldspar) — metamorphic

Dark mafic metamorphic rock, likely amphibolite

Amphibolite; chiefly hornblende amphibole and plagioclase feldspar

Fossil Shark Tooth (Carcharadon sp. (likely Carcharodon carcharias or similar Lamniformes)) — fossil

Fossil Shark Tooth

Carcharadon sp. (likely Carcharodon carcharias or similar Lamniformes)

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

Pyrite with Quartz

Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)

Jasper-Agate (Silicon Dioxide (SiO2)) — sedimentary

Jasper-Agate

Silicon Dioxide (SiO2)

One Pound Coin (UK) (Nickel-Brass Alloy (Cu-Zn-Ni)) — mineral

One Pound Coin (UK)

Nickel-Brass Alloy (Cu-Zn-Ni)

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Epidosite with Quartz (Unakite-variant or Jasper) (Epidotized Metasomatite) — metamorphic

Epidosite with Quartz (Unakite-variant or Jasper)

Epidotized Metasomatite

Weathered basalt or andesitic volcanic rock (Porphyritic basalt–andesite; likely plagioclase and pyroxene with iron-oxide alteration) — igneous

Weathered basalt or andesitic volcanic rock

Porphyritic basalt–andesite; likely plagioclase and pyroxene with iron-oxide alteration

Iron-stained quartz-bearing rock (probable weathered quartz vein or ironstone) (Quartz (SiO₂) with goethite/limonite iron oxides; possibly altered volcanic or metamorphic host rock) — mineral

Iron-stained quartz-bearing rock (probable weathered quartz vein or ironstone)

Quartz (SiO₂) with goethite/limonite iron oxides; possibly altered volcanic or metamorphic host rock

Blue-green fluorite (rough crystal) (Fluorite, calcium fluoride (CaF₂)) — mineral

Blue-green fluorite (rough crystal)

Fluorite, calcium fluoride (CaF₂)

Quartz Druzy on Matrix (likely Agate or Jasper) (Silicon Dioxide (SiO2) with various mineral inclusions) — mineral

Quartz Druzy on Matrix (likely Agate or Jasper)

Silicon Dioxide (SiO2) with various mineral inclusions

Polished/tumbled pale-yellow stone, possibly calcite (Likely calcite (CaCO₃); identification is uncertain from the image alone) — mineral

Polished/tumbled pale-yellow stone, possibly calcite

Likely calcite (CaCO₃); identification is uncertain from the image alone

Water-worn quartzite or sandstone cobble (Quartzite (predominantly SiO₂), possibly quartz-rich sandstone) — metamorphic

Water-worn quartzite or sandstone cobble

Quartzite (predominantly SiO₂), possibly quartz-rich sandstone

Amethyst on Basalt (Silicon dioxide (SiO2) with trace Iron) — mineral

Amethyst on Basalt

Silicon dioxide (SiO2) with trace Iron

Tumbled cream-colored stone, likely quartzite or chert (Quartzite (SiO₂), or microcrystalline quartz/chert (SiO₂)) — metamorphic

Tumbled cream-colored stone, likely quartzite or chert

Quartzite (SiO₂), or microcrystalline quartz/chert (SiO₂)

White Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

White Quartz Pebble

Silicon Dioxide (SiO2)

Coarse-grained metamorphic rock, likely amphibolite or hornblende gneiss (Amphibolite; predominantly hornblende amphibole and plagioclase feldspar, possibly with quartz and biotite) — metamorphic

Coarse-grained metamorphic rock, likely amphibolite or hornblende gneiss

Amphibolite; predominantly hornblende amphibole and plagioclase feldspar, possibly with quartz and biotite

Dyed Agate (Tumbled) (Silicon Dioxide (Chalcedony variety, artificially dyed)) — gemstone

Dyed Agate (Tumbled)

Silicon Dioxide (Chalcedony variety, artificially dyed)

Tumbled/polished aventurine (likely green quartzite) (Quartzite, predominantly quartz (SiO₂), colored by fuchsite or chlorite inclusions) — metamorphic

Tumbled/polished aventurine (likely green quartzite)

Quartzite, predominantly quartz (SiO₂), colored by fuchsite or chlorite inclusions

Sandstone (Sedimentary Rock (Quartz Sandstone)) — sedimentary

Sandstone

Sedimentary Rock (Quartz Sandstone)

Blue Goldstone (Man-made glass with cobalt and metal flecks) — man-made glass

Blue Goldstone

Man-made glass with cobalt and metal flecks

Quartz Pebble (Quartzite Pebble) (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble (Quartzite Pebble)

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz pebble (Silicon dioxide (SiO2)) — sedimentary

Quartz pebble

Silicon dioxide (SiO2)

Quartz Pebble (Quartz (Silicon Dioxide, SiO2)) — mineral

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Muscovite Mica Schist (Metamorphic rock rich in muscovite mica (KAl2(AlSi3O10)(F,OH)2)) — metamorphic

Muscovite Mica Schist

Metamorphic rock rich in muscovite mica (KAl2(AlSi3O10)(F,OH)2)

Quartzite Pebble (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartz pebble (Silicon dioxide (SiO2)) — sedimentary

Quartz pebble

Silicon dioxide (SiO2)

Sandstone (Arenite) — Sedimentary

Sandstone

Arenite

Banded calcite (likely travertine or flowstone) (Calcite, CaCO₃; possibly speleothem/travertine) — mineral

Banded calcite (likely travertine or flowstone)

Calcite, CaCO₃; possibly speleothem/travertine

Quartz-rich rock fragment, possibly mica-bearing pegmatite (Likely quartz–feldspar–mica aggregate; exact identification requires testing) — igneous

Quartz-rich rock fragment, possibly mica-bearing pegmatite

Likely quartz–feldspar–mica aggregate; exact identification requires testing

River Pebble (Likely Quartzite or Chalcedony) (Silicon Dioxide (SiO2) - granular metamorphic variety) — metamorphic

River Pebble (Likely Quartzite or Chalcedony)

Silicon Dioxide (SiO2) - granular metamorphic variety

Small pale pebble, possibly quartz or feldspar (Unidentified silicate; appearance alone cannot distinguish quartz (SiO₂) from feldspar) — mineral

Small pale pebble, possibly quartz or feldspar

Unidentified silicate; appearance alone cannot distinguish quartz (SiO₂) from feldspar

Pale limestone or calcite-rich rock (Calcite (CaCO₃), likely micritic limestone) — sedimentary

Pale limestone or calcite-rich rock

Calcite (CaCO₃), likely micritic limestone

Pink-and-gray quartz-rich pegmatite, possibly rose quartz with feldspar (Quartz (SiO₂) with K-feldspar/plagioclase; likely pegmatitic granite) — igneous

Pink-and-gray quartz-rich pegmatite, possibly rose quartz with feldspar

Quartz (SiO₂) with K-feldspar/plagioclase; likely pegmatitic granite

Amethyst quartz crystal (Quartz, silicon dioxide (SiO₂), purple variety amethyst) — mineral

Amethyst quartz crystal

Quartz, silicon dioxide (SiO₂), purple variety amethyst