Rock Identifier

Category

Organic Materia (Not A Rock Or Mineral)

Browse organic materia (not a rock or mineral) specimens identified by the Rock Identifier community.

River Stone / Pebble (Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)) — Mineral, Sediment

River Stone / Pebble

Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)

Mineral, Sediment
Jasper (Mookaite variety likely) (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Jasper (Mookaite variety likely)

Silicon Dioxide (SiO2) with iron oxide inclusions

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

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary
Quartz Veined Rock (Likely Graywacke or Quartzite) (Silicon Dioxide (SiO2) veins in Metasedimentary matrix) — metamorphic

Quartz Veined Rock (Likely Graywacke or Quartzite)

Silicon Dioxide (SiO2) veins in Metasedimentary matrix

metamorphic
Sandstone (specifically Banded Sandstone) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (specifically Banded Sandstone)

Clastic sedimentary rock (primarily SiO2)

sedimentary
Basalt Porphyry (Porphyritic Basalt) — igneous

Basalt Porphyry

Porphyritic Basalt

igneous
Dalmatian Jasper (Dalmatian Stone (a microcrystalline quartz and feldspar rock with arfvedsonite)) — igneous

Dalmatian Jasper

Dalmatian Stone (a microcrystalline quartz and feldspar rock with arfvedsonite)

igneous
Chert (varieties: Flint or Chalcedony) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (varieties: Flint or Chalcedony)

Microcrystalline Quartz (SiO2)

sedimentary
Sandstone (with Limonite staining) (Arenite (primarily SiO2 with FeO(OH)·nH2O)) — sedimentary

Sandstone (with Limonite staining)

Arenite (primarily SiO2 with FeO(OH)·nH2O)

sedimentary
Granite (Phaneritic Plutonic Igneous Rock (primarily composed of quartz, alkali feldspar, and plagioclase)) — igneous

Granite

Phaneritic Plutonic Igneous Rock (primarily composed of quartz, alkali feldspar, and plagioclase)

igneous
Sandstone (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone

Arenite (composed primarily of SiO2)

sedimentary
Schist (Mica Schist (primarily consisting of muscovite KAl2(AlSi3O10)(OH)2 or biotite K(Mg,Fe)3(AlSi3O10)(OH)2)) — metamorphic

Schist

Mica Schist (primarily consisting of muscovite KAl2(AlSi3O10)(OH)2 or biotite K(Mg,Fe)3(AlSi3O10)(OH)2)

metamorphic
Turquoise (CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)) — mineral

Turquoise

CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)

mineral
Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

sedimentary
Granite (Phaneritic Plutonic Felsic Rock) — igneous

Granite

Phaneritic Plutonic Felsic Rock

igneous
Chert (Flint) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary
Glauconite (Glauconitic Sandstone) (Glauconite [(K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2]) — sedimentary

Glauconite (Glauconitic Sandstone)

Glauconite [(K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2]

sedimentary
Almandine Garnet in Matrix (Almandine (Fe3Al2(SiO4)3)) — metamorphic

Almandine Garnet in Matrix

Almandine (Fe3Al2(SiO4)3)

metamorphic
Quartz / Common Agate (Silicon Dioxide (SiO2)) — mineral

Quartz / Common Agate

Silicon Dioxide (SiO2)

mineral
Opalite (Synthetic Opalised Glass) — Mineral (Synthetic / Man-made)

Opalite

Synthetic Opalised Glass

Mineral (Synthetic / Man-made)
Fossiliferous Chert with Brachiopod Impression (Chert (SiO2) containing Brachiopoda fossil remains) — sedimentary

Fossiliferous Chert with Brachiopod Impression

Chert (SiO2) containing Brachiopoda fossil remains

sedimentary
Coal (most likely Bituminous or Anthracite) (Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)) — Sedimentary Rock

Coal (most likely Bituminous or Anthracite)

Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)

Sedimentary Rock
Glauconitic Sandstone (Glauconitic Quartz-Wacke / Sandstone (Fe(II),Fe(III),Al,Mg)2-3(Si,Al)4O10(OH)2) — sedimentary

Glauconitic Sandstone

Glauconitic Quartz-Wacke / Sandstone (Fe(II),Fe(III),Al,Mg)2-3(Si,Al)4O10(OH)2

sedimentary
Sandstone or Limestone (Arenite or Calcareous Sedimentary Rock) — Sedimentary

Sandstone or Limestone

Arenite or Calcareous Sedimentary Rock

Sedimentary
Amethyst (Amethyst (Silicon Dioxide - SiO2)) — mineral

Amethyst

Amethyst (Silicon Dioxide - SiO2)

mineral
Tiger's Eye (Pseudomorph of Quartz after Crocidolite (SiO2)) — mineral

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

mineral
Pebble (Likely Basalt or Siltstone) (Clastic sedimentary rock or mafic volcanic rock) — Igneous or Sedimentary

Pebble (Likely Basalt or Siltstone)

Clastic sedimentary rock or mafic volcanic rock

Igneous or Sedimentary
Granite Sand (Decomposed Granite) (Grus / Quartz-Feldspar Detritus) — sedimentary

Granite Sand (Decomposed Granite)

Grus / Quartz-Feldspar Detritus

sedimentary
Quartzite River Rock (Quartzite (primarily SiO2)) — metamorphic

Quartzite River Rock

Quartzite (primarily SiO2)

metamorphic
Red Jasper (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Red Jasper

Jasper (Silicon Dioxide, SiO2)

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

Quartz (Druzy)

Silicon Dioxide (SiO2)

mineral
Chert (Flint nodule) (Silicon dioxide (SiO2)) — sedimentary

Chert (Flint nodule)

Silicon dioxide (SiO2)

sedimentary
Veined Pebble (likely a Quartz-Veined Pebble) (Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)) — Sedimentary Rock (possibly conglomerate or breccia with a quartz vein)

Veined Pebble (likely a Quartz-Veined Pebble)

Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)

Sedimentary Rock (possibly conglomerate or breccia with a quartz vein)
Sandstone (Arenite) — sedimentary

Sandstone

Arenite

sedimentary
Banded Agate (Polished Slice) (Chalcedony (cryptocrystalline Quartz), SiO2) — mineral

Banded Agate (Polished Slice)

Chalcedony (cryptocrystalline Quartz), SiO2

mineral
Dalmatian Stone (Peralkaline rhyolite) — igneous

Dalmatian Stone

Peralkaline rhyolite

igneous
Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

sedimentary
Sandstone (Arenite) — sedimentary

Sandstone

Arenite

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

Gneiss

High-grade metamorphic rock (Gneiss)

metamorphic
Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

mineral
Greenschist (Greenschist facies rock) — Metamorphic

Greenschist

Greenschist facies rock

Metamorphic
Tiger's Eye (Brown/Dark variety) (Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)) — metamorphic

Tiger's Eye (Brown/Dark variety)

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)

metamorphic