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

Greenschist (Greenschist facies metamorphic rock) — metamorphic

Greenschist

Greenschist facies metamorphic rock

Quartzite River Pebble (Quartzite (principally SiO2)) — metamorphic

Quartzite River Pebble

Quartzite (principally SiO2)

Quartz (Quartz (SiO₂)) — mineral

Quartz

Quartz (SiO₂)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Ruby (Raw Corundum) (Corundum (Al2O3 with Chromium impurities)) — mineral

Ruby (Raw Corundum)

Corundum (Al2O3 with Chromium impurities)

Chert (Jasper/River Pebble) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper/River Pebble)

Silicon Dioxide (SiO2)

Chert (Common Opal/Jasper variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Common Opal/Jasper variety)

Microcrystalline Quartz (SiO2)

Granite (Phaneritic Felsic Igneous Rock) — igneous

Granite

Phaneritic Felsic Igneous Rock

Quartz pebble / River stone (SiO2 (Silicon Dioxide)) — mineral

Quartz pebble / River stone

SiO2 (Silicon Dioxide)

Yellow Quartzite Pebble (Quartzite (primarily Silicon Dioxide - SiO2)) — metamorphic

Yellow Quartzite Pebble

Quartzite (primarily Silicon Dioxide - SiO2)

Pink Granite (Water-worn Pebble) (Felsic Intrusive Igneous Rock (Granite)) — igneous

Pink Granite (Water-worn Pebble)

Felsic Intrusive Igneous Rock (Granite)

Rough Aquamarine (Beryl (Be₃Al₂Si₆O‑₁•H₂O)) — Mineral

Rough Aquamarine

Beryl (Be₃Al₂Si₆O‑₁•H₂O)

Sodalite (Sodalite (Na8(Al6Si6O24)Cl2)) — mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Ironstone Concretion (Moqui Marble) (Ferruginous Concretion (Fe2O3 / FeO(OH))) — sedimentary

Ironstone Concretion (Moqui Marble)

Ferruginous Concretion (Fe2O3 / FeO(OH))

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Howlite (Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)) — mineral

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

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

Quartzite Pebble (River Rock)

Quartzite (primarily SiO2)

Chert / Flint Pebble (Silicon Dioxide (SiO2)) — sedimentary

Chert / Flint Pebble

Silicon Dioxide (SiO2)

Quartzite (Iron-stained) (Quartzite (SiO2 with Fe2O3 staining)) — metamorphic

Quartzite (Iron-stained)

Quartzite (SiO2 with Fe2O3 staining)

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

Dendritic Agate (Tumbled) (Silicon Dioxide (SiO2) with inclusions) — mineral

Dendritic Agate (Tumbled)

Silicon Dioxide (SiO2) with inclusions

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Beryl (Aquamarine) in Matrix with Schorl (Be3Al2Si6O18 (Beryl) with NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)) — mineral

Beryl (Aquamarine) in Matrix with Schorl

Be3Al2Si6O18 (Beryl) with NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)

Satin Spar (often marketed as Selenite) (Fibrous Gypsum (CaSO4·2H2O)) — mineral

Satin Spar (often marketed as Selenite)

Fibrous Gypsum (CaSO4·2H2O)

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Slag (Industrial Glass) (Anthropogenic Vitreous Slag (Post-industrial byproduct)) — igneous

Slag (Industrial Glass)

Anthropogenic Vitreous Slag (Post-industrial byproduct)

Basalt with Epidote (Flowerstone-like texture) (Amygdaloidal Basalt (silicate mineral inclusions)) — igneous

Basalt with Epidote (Flowerstone-like texture)

Amygdaloidal Basalt (silicate mineral inclusions)

Serpentinite (often containing Jadeite/Nephrite) (Antigorite-rich Serpentine Rock, (Mg, Fe)3Si2O5(OH)4) — metamorphic

Serpentinite (often containing Jadeite/Nephrite)

Antigorite-rich Serpentine Rock, (Mg, Fe)3Si2O5(OH)4

Brown Jasper (Jasper (a cryptocrystalline variety of Quartz, SiO2)) — Mineral, specifically a variety of Quartz

Brown Jasper

Jasper (a cryptocrystalline variety of Quartz, SiO2)

Mineral, specifically a variety of Quartz

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Sandstone (with Quartz Vein/Inclusion) (Arenite (primarily SiO2)) — sedimentary

Sandstone (with Quartz Vein/Inclusion)

Arenite (primarily SiO2)

Quartzite (Iron-stained) (Quartzite (mostly SiO2 with Fe2O3 impurities)) — metamorphic

Quartzite (Iron-stained)

Quartzite (mostly SiO2 with Fe2O3 impurities)

Hematite (Hematite (Fe2O3)) — Mineral

Hematite

Hematite (Fe2O3)

Herkimer Diamond (Double-terminated Quartz (Silicon Dioxide, SiO2)) — mineral

Herkimer Diamond

Double-terminated Quartz (Silicon Dioxide, SiO2)

Crazy Lace Agate (Agate (Chalcedony - SiO2)) — Mineral

Crazy Lace Agate

Agate (Chalcedony - SiO2)

Jasper with Agate Inclusions (Silicon Dioxide (SiO2) - variety of Quartz/Chert) — sedimentary

Jasper with Agate Inclusions

Silicon Dioxide (SiO2) - variety of Quartz/Chert

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Pink Quartzite (Quartzite (SiO2 with iron oxide inclusions)) — metamorphic

Pink Quartzite

Quartzite (SiO2 with iron oxide inclusions)

Chert (Common Opal/Agate variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Common Opal/Agate variety)

Microcrystalline Quartz (SiO2)

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

Satin Spar (Gypsum)

Hydrous Calcium Sulfate (CaSO4·2H2O)