Rock Identifier

Community gallery

All rocks & minerals

Every specimen the Rock Identifier community has discovered, from desert agates to deep-sea basalts.

Yellow Agate (Silicon Dioxide (SiO2)) — mineral

Yellow Agate

Silicon Dioxide (SiO2)

mineral
Green Aventurine (Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)) — mineral

Green Aventurine

Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

mineral
Granite (Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)) — igneous

Granite

Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)

igneous
Columnar Calcite / Satin Spar (Calcite (Calcium Carbonate, CaCO3)) — mineral

Columnar Calcite / Satin Spar

Calcite (Calcium Carbonate, CaCO3)

mineral
Nephrite Jade (Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)) — metamorphic

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

metamorphic
Satin Spar (Gypsum) (Calcium Sulfate Dihydrate (CaSO4·2H2O)) — mineral

Satin Spar (Gypsum)

Calcium Sulfate Dihydrate (CaSO4·2H2O)

mineral
Quartzite (Quartzite (high SiO2 content)) — metamorphic

Quartzite

Quartzite (high SiO2 content)

metamorphic
Granite Pebble (Granite (composed primarily of Quartz SiO2, Feldspar KAlSi3O8, and Biotite/Hornblende)) — igneous

Granite Pebble

Granite (composed primarily of Quartz SiO2, Feldspar KAlSi3O8, and Biotite/Hornblende)

igneous
Granite (Granite (Alkali-feldspar granite)) — igneous

Granite

Granite (Alkali-feldspar granite)

igneous
Red Jasper (Silicon dioxide with iron inclusions (SiO2)) — sedimentary

Red Jasper

Silicon dioxide with iron inclusions (SiO2)

sedimentary
Snowflake Obsidian (Obsidian with Spherulitic Cristobalite (SiO2)) — igneous

Snowflake Obsidian

Obsidian with Spherulitic Cristobalite (SiO2)

igneous
Basalt River Pebble (Basalt) — igneous

Basalt River Pebble

Basalt

igneous
Quartzite and Sandstone Pebbles (Silicon dioxide (SiO2)) — metamorphic and sedimentary

Quartzite and Sandstone Pebbles

Silicon dioxide (SiO2)

metamorphic and sedimentary
Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

metamorphic
Sandstone (Ferruginous) (Arenite with Iron Oxide cement (SiO2 + Fe2O3)) — sedimentary

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (SiO2 + Fe2O3)

sedimentary
Malachite (Copper carbonate hydroxide [Cu2CO3(OH)2]) — mineral

Malachite

Copper carbonate hydroxide [Cu2CO3(OH)2]

mineral
Chert (Jasper variety) (Silicon Dioxide (SiO2) - Cryptocrystalline Quartz) — sedimentary

Chert (Jasper variety)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

sedimentary
Serpentine (Serpentinite (Mg, Fe, Ni)3Si2O5(OH)4) — metamorphic

Serpentine

Serpentinite (Mg, Fe, Ni)3Si2O5(OH)4

metamorphic
Silver Sheen Obsidian (Volcanic Glass (SiO2)) — igneous

Silver Sheen Obsidian

Volcanic Glass (SiO2)

igneous
Dendritic Agate (Silicon Dioxide with inclusions (SiO2 + Mn/Fe)) — mineral

Dendritic Agate

Silicon Dioxide with inclusions (SiO2 + Mn/Fe)

mineral
Basalt Pebble (Basalt) — igneous

Basalt Pebble

Basalt

igneous
Quartzite Pebble (Quartzite (SiO2)) — metamorphic

Quartzite Pebble

Quartzite (SiO2)

metamorphic
Basalt with Quartz Infill (Basalt (Mafic Extrusive Volcanic Rock)) — igneous

Basalt with Quartz Infill

Basalt (Mafic Extrusive Volcanic Rock)

igneous
Dyed Blue Agate (Silicon Dioxide (SiO2) with artificial cobalt-based dye) — mineral

Dyed Blue Agate

Silicon Dioxide (SiO2) with artificial cobalt-based dye

mineral
Red Quartzite (Quartzite (primarily SiO2)) — metamorphic

Red Quartzite

Quartzite (primarily SiO2)

metamorphic
Sandstone (Arenite (primarily Quartz Sandstone with Iron Oxide)) — sedimentary

Sandstone

Arenite (primarily Quartz Sandstone with Iron Oxide)

sedimentary
Chert (Jasper/Flint variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

sedimentary
Sandstone (Arenite (with iron oxide cement)) — sedimentary

Sandstone

Arenite (with iron oxide cement)

sedimentary
Porphyritic Andesite (Andesite (with white Plagioclase phenocrysts)) — igneous

Porphyritic Andesite

Andesite (with white Plagioclase phenocrysts)

igneous
Gabbro with Quartz Vein (Gabbro (mafic intrusive igneous rock)) — igneous

Gabbro with Quartz Vein

Gabbro (mafic intrusive igneous rock)

igneous
Porphyritic Basalt (with Amygdules) (Amygdaloidal Porphyritic Basalt) — igneous

Porphyritic Basalt (with Amygdules)

Amygdaloidal Porphyritic Basalt

igneous
Greenschist (Greenschist (Chlorite Schist)) — metamorphic

Greenschist

Greenschist (Chlorite Schist)

metamorphic
Sandstone (Ferruginous) (Arenite (with Iron Oxide cement)) — sedimentary

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

sedimentary
Greenstone (Greenschist) — metamorphic

Greenstone

Greenschist

metamorphic
Iron-stained Quartz Pebble (Crystalline Silicon Dioxide (SiO2) with Hematite/Limonite staining) — mineral

Iron-stained Quartz Pebble

Crystalline Silicon Dioxide (SiO2) with Hematite/Limonite staining

mineral
Basalt with Desert Varnish (Mafic Igneous Rock with Ferromanganese Coating) — igneous

Basalt with Desert Varnish

Mafic Igneous Rock with Ferromanganese Coating

igneous
Scoria (Scoria (vesicular volcanic rock)) — igneous

Scoria

Scoria (vesicular volcanic rock)

igneous
Banded Iron Formation (Jaspillite) (Banded Iron Formation (BIF)) — sedimentary

Banded Iron Formation (Jaspillite)

Banded Iron Formation (BIF)

sedimentary
Petrified Wood (Silicified Wood (primarily SiO2)) — mineral

Petrified Wood

Silicified Wood (primarily SiO2)

mineral
Quartz (Crystal Fragment) (Silicon Dioxide (SiO2)) — mineral

Quartz (Crystal Fragment)

Silicon Dioxide (SiO2)

mineral
Gold Ore (Lode Gold) (Native Gold (Au) in Matrix) — mineral

Gold Ore (Lode Gold)

Native Gold (Au) in Matrix

mineral
Quartz (specifically a water-worn Quartzite or Chalcedony pebble) (Silicon Dioxide (SiO2)) — mineral

Quartz (specifically a water-worn Quartzite or Chalcedony pebble)

Silicon Dioxide (SiO2)

mineral