Rock Identifier

Category

Organic (Often Found By Beachcombers)

Browse organic (often found by beachcombers) specimens identified by the Rock Identifier community.

Learn about Organic (Often Found By Beachcombers) in the encyclopedia

Sapropel

Sapropel

Bituminous Shale

Bituminous Shale

Black Shale

Black Shale

Petrified Wood

Petrified Wood

Amber

Amber

Jet

Jet

Peat

Peat

Oil Shale

Oil Shale

Monazite

Monazite

Reptile Jasper

Reptile Jasper

Pearl

Pearl

Pegmatite

Pegmatite

Pebble (likely Limestone or Siltstone) (Lithic fragment (calcareous or siliciclastic)) — sedimentary

Pebble (likely Limestone or Siltstone)

Lithic fragment (calcareous or siliciclastic)

Quartzite Pebble (Quartzite (mostly SiO2)) — metamorphic

Quartzite Pebble

Quartzite (mostly SiO2)

Greenstone (Metabasalt or Greenschist (often contains Chlorite, Actinolite, and Epidote)) — metamorphic

Greenstone

Metabasalt or Greenschist (often contains Chlorite, Actinolite, and Epidote)

Quartzite (Quartzite (High-purity SiO2)) — metamorphic

Quartzite

Quartzite (High-purity SiO2)

Chert (specifically White Chert or Novaculite) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Chert (specifically White Chert or Novaculite)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (or Chalcedony) (Chert (Microcrystalline Quartz, SiO2)) — sedimentary

Chert (or Chalcedony)

Chert (Microcrystalline Quartz, SiO2)

Greyling Sandstone / Greywacke (Lithic Wacke (SiO2 + diverse mineral fragments)) — sedimentary

Greyling Sandstone / Greywacke

Lithic Wacke (SiO2 + diverse mineral fragments)

Chert (or Flint) (Mocrocrystalline Quartz (SiO2)) — sedimentary

Chert (or Flint)

Mocrocrystalline Quartz (SiO2)

Chert (and Flint variant) (Silicon Dioxide (SiO2)) — sedimentary

Chert (and Flint variant)

Silicon Dioxide (SiO2)

Chert (Flint) (Chert (Silicon Dioxide, SiO2)) — sedimentary

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Green Slag Glass (Amorphous Silica Glass (Anthropogenic)) — Industrial byproduct (often mistaken for obsidian or mineral)

Green Slag Glass

Amorphous Silica Glass (Anthropogenic)

Industrial byproduct (often mistaken for obsidian or mineral)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite with Iron Inclusions (Metamorphosed Quartz Arenite (SiO2)) — metamorphic

Quartzite with Iron Inclusions

Metamorphosed Quartz Arenite (SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Quartzite pebble (Quartzite (SiO2)) — metamorphic

Quartzite pebble

Quartzite (SiO2)

Granite (Intrusive igneous felsic rock) — igneous

Granite

Intrusive igneous felsic rock

Pink Spinel (Magnesium Aluminum Oxide (MgAl2O4)) — gemstone

Pink Spinel

Magnesium Aluminum Oxide (MgAl2O4)

Arsenopyrite (Arsenopyrite (FeAsS)) — mineral

Arsenopyrite

Arsenopyrite (FeAsS)

Rhodonite (Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3) — mineral

Rhodonite

Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3

Yellow Jade (Nephrite or Quartzite variety) (Ca2(Mg,Fe)5Si8O22(OH)2 (Nephrite) / SiO2 (Quartzite variant)) — metamorphic

Yellow Jade (Nephrite or Quartzite variety)

Ca2(Mg,Fe)5Si8O22(OH)2 (Nephrite) / SiO2 (Quartzite variant)

Bauxite (Concretionary) (Bauxite (Al(OH)3, AlO(OH))) — sedimentary

Bauxite (Concretionary)

Bauxite (Al(OH)3, AlO(OH))

Molybdenite in Quartz (Molybdenite (MoS2) with Quartz (SiO2)) — mineral

Molybdenite in Quartz

Molybdenite (MoS2) with Quartz (SiO2)

Rose Quartz (Silicon dioxide (SiO2)) — mineral

Rose Quartz

Silicon dioxide (SiO2)

Fuchsite in Quartz (K(Al,Cr)2(AlSi3O10)(OH)2 (Muscovite with Chromium)) — metamorphic

Fuchsite in Quartz

K(Al,Cr)2(AlSi3O10)(OH)2 (Muscovite with Chromium)

Prehnite (Prehnite (Ca2Al(AlSi3O10)(OH)2)) — mineral

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Arsenopyrite (Arsenopyrite (FeAsS)) — mineral

Arsenopyrite

Arsenopyrite (FeAsS)

Rhodonite (Rhodonite (Manganese Iron Magnesium Calcium Silicate - Mn%,Fe%,Mg,Ca)SiO₃) — mineral

Rhodonite

Rhodonite (Manganese Iron Magnesium Calcium Silicate - Mn%,Fe%,Mg,Ca)SiO₃

Granite (Phaneritic plutonic rock (Quartz, Feldspar, Mica)) — igneous

Granite

Phaneritic plutonic rock (Quartz, Feldspar, Mica)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Arsenopyrite in Sulphide Ore (Arsenopyrite (FeAsS)) — mineral

Arsenopyrite in Sulphide Ore

Arsenopyrite (FeAsS)

Hypersthene (Enstatite (Hypersthene variety), (Mg,Fe)SiO3) — mineral

Hypersthene

Enstatite (Hypersthene variety), (Mg,Fe)SiO3

Howlite (Hydrous calcium borosilicate (Ca2B5SiO9(OH)5)) — mineral

Howlite

Hydrous calcium borosilicate (Ca2B5SiO9(OH)5)

Eagle Eye / Grey Tiger Eye (Pseudomorph of Quartz after Crocidolite (SiO2)) — mineral

Eagle Eye / Grey Tiger Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Rose Quartz (Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese) — mineral

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Chert (Chalcedony/Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Chalcedony/Flint)

Microcrystalline Quartz (SiO2)

Schist (Schist (various compositions)) — metamorphic

Schist

Schist (various compositions)

Travertine (Travertine (CaCO3)) — sedimentary

Travertine

Travertine (CaCO3)

Rose Quartz (Quartz (Silicon Dioxide - SiO2) with trace amounts of titanium, iron, or manganese) — mineral

Rose Quartz

Quartz (Silicon Dioxide - SiO2) with trace amounts of titanium, iron, or manganese

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

Green Jade (specifically Nephrite)

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

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Quartzite (Quartzite (mostly SiO2)) — metamorphic

Quartzite

Quartzite (mostly SiO2)