Rock Identifier

Community gallery

All rocks & minerals

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

Vuggy Quartz on Matrix (Crystalline Silicon Dioxide (SiO2)) — mineral

Vuggy Quartz on Matrix

Crystalline Silicon Dioxide (SiO2)

mineral
Chalcedony (Botryoidal) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2)

mineral
Chert (White Chert or Flint) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (White Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary
Chert (with small quartz vug) (Chert (SiO2)) — sedimentary

Chert (with small quartz vug)

Chert (SiO2)

sedimentary
Fossiliferous Limestone (Calcium Carbonate (CaCO3) with Bioclastic Inclusions) — sedimentary

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Bioclastic Inclusions

sedimentary
Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

mineral
Slickenside in Limestone (Tectonized Limestone / Calcite (CaCO3)) — metamorphic (localized) or sedimentary

Slickenside in Limestone

Tectonized Limestone / Calcite (CaCO3)

metamorphic (localized) or sedimentary
Sandstone (Arenite) — sedimentary

Sandstone

Arenite

sedimentary
Limestone with Calcite Crystals (Sedimentary Rock containing Calcium Carbonate (CaCO3)) — sedimentary

Limestone with Calcite Crystals

Sedimentary Rock containing Calcium Carbonate (CaCO3)

sedimentary
Chert (with Drusy Quartz Pocket) (Silicon Dioxide (SiO2)) — sedimentary

Chert (with Drusy Quartz Pocket)

Silicon Dioxide (SiO2)

sedimentary
Chert (containing Quartz veins) (Chert (SiO2)) — sedimentary

Chert (containing Quartz veins)

Chert (SiO2)

sedimentary
Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Quartz (Silicon dioxide (SiO2)) — Mineral

Quartz

Silicon dioxide (SiO2)

Mineral
Fuchsite in Quartz (K(Al,Cr)2(AlSi3O10)(OH)2 in SiO2) — Metamorphic Rock / Mineral Association

Fuchsite in Quartz

K(Al,Cr)2(AlSi3O10)(OH)2 in SiO2

Metamorphic Rock / Mineral Association
Jasper / Chert (Red) (Cryptocrystalline quartz (SiO2)) — Sedimentary / Mineral

Jasper / Chert (Red)

Cryptocrystalline quartz (SiO2)

Sedimentary / Mineral
Opal (Hydrated Silica (SiO2·nH2O)) — mineraloid

Opal

Hydrated Silica (SiO2·nH2O)

mineraloid
Granitic Pegmatite with Tourmaline/Chlorite (Pegmatite) — Igneous

Granitic Pegmatite with Tourmaline/Chlorite

Pegmatite

Igneous
Obsidian (Obsidian) — Igneous

Obsidian

Obsidian

Igneous
Quartz with inclusions (likely Chlorite or Hornblende) and country rock (SiO2 (Quartz) with associated ferromagnesian minerals) — Mineral/Igneous/Metamorphic association

Quartz with inclusions (likely Chlorite or Hornblende) and country rock

SiO2 (Quartz) with associated ferromagnesian minerals

Mineral/Igneous/Metamorphic association
Porphyritic Andesite (Andesite) — igneous

Porphyritic Andesite

Andesite

igneous
Granite or Granitic Gneiss (Granitoid / Gneiss) — Igneous / Metamorphic

Granite or Granitic Gneiss

Granitoid / Gneiss

Igneous / Metamorphic
Granite (Granite) — Igneous

Granite

Granite

Igneous
Granite or Pegmatite with Quartz and Feldspar (Granitoid) — igneous

Granite or Pegmatite with Quartz and Feldspar

Granitoid

igneous
Quartz (Silicon dioxide (SiO2)) — Mineral

Quartz

Silicon dioxide (SiO2)

Mineral
Granite (Granite) — Igneous

Granite

Granite

Igneous
Granite Gneiss (Granitic Gneiss) — Metamorphic

Granite Gneiss

Granitic Gneiss

Metamorphic
Quartzite (Quartzite) — Metamorphic

Quartzite

Quartzite

Metamorphic
Granodiorite / Granite (Weathered) (Granodiorite) — Igneous

Granodiorite / Granite (Weathered)

Granodiorite

Igneous
Granite or Granodiorite (weathered fieldstone) (Granitoid) — igneous

Granite or Granodiorite (weathered fieldstone)

Granitoid

igneous
Granite or Granitic Gneiss River Rock (Granite / Gneiss) — Igneous or Metamorphic

Granite or Granitic Gneiss River Rock

Granite / Gneiss

Igneous or Metamorphic
Chert (or potentially massive Quartz/Quartzite) (SiO2 (Silicon Dioxide)) — sedimentary (if chert) / metamorphic (if quartzite)

Chert (or potentially massive Quartz/Quartzite)

SiO2 (Silicon Dioxide)

sedimentary (if chert) / metamorphic (if quartzite)
Quartzite (Quartzite) — metamorphic

Quartzite

Quartzite

metamorphic
Granite (Phaneritic intrusive igneous rock (Quartz, Feldspar, Mica)) — igneous

Granite

Phaneritic intrusive igneous rock (Quartz, Feldspar, Mica)

igneous
Limestone with Chert (Calcium Carbonate (CaCO3) with Silica (SiO2) inclusions) — sedimentary

Limestone with Chert

Calcium Carbonate (CaCO3) with Silica (SiO2) inclusions

sedimentary
Limestone with Chert Nodules (Sedimentary Calcium Carbonate (CaCO3) with Microcrystalline Silica (SiO2) inclusions) — sedimentary

Limestone with Chert Nodules

Sedimentary Calcium Carbonate (CaCO3) with Microcrystalline Silica (SiO2) inclusions

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

Granite Pebble

Granite (Felsic intrusive igneous rock)

igneous
Granite Pebble (Granite (Phaneritic intrusive igneous rock)) — igneous

Granite Pebble

Granite (Phaneritic intrusive igneous rock)

igneous
Diorite (Intrusive Igneous Diorite) — igneous

Diorite

Intrusive Igneous Diorite

igneous
Ferruginous Sandstone (Ironstone) (Iron-rich Arenite) — sedimentary

Ferruginous Sandstone (Ironstone)

Iron-rich Arenite

sedimentary
Shale with Iron Staining (Fissile Argillaceous Sedimentary Rock) — sedimentary

Shale with Iron Staining

Fissile Argillaceous Sedimentary Rock

sedimentary
Fulgurite (Fulgurite (Lechatelierite)) — metamorphic

Fulgurite

Fulgurite (Lechatelierite)

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

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

mineral