Rock Identifier

Category

Organic (Geological Relative)

Browse organic (geological relative) specimens identified by the Rock Identifier community.

Basalt (Vesicular) (Extrusive igneous rock with vesicular texture) — igneous

Basalt (Vesicular)

Extrusive igneous rock with vesicular texture

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Greenstone (Greenschist (primarily composed of chlorite, actinolite, and epidote)) — metamorphic

Greenstone

Greenschist (primarily composed of chlorite, actinolite, and epidote)

Weathered iron-rich rock, likely limonite/goethite-bearing laterite (Limonite–goethite aggregate, commonly approximated as hydrated iron oxides (FeO(OH)·nH₂O)) — mineral

Weathered iron-rich rock, likely limonite/goethite-bearing laterite

Limonite–goethite aggregate, commonly approximated as hydrated iron oxides (FeO(OH)·nH₂O)

Seashell Fragment (Calcium carbonate (CaCO3) - primarily Aragonite or Calcite) — fossil

Seashell Fragment

Calcium carbonate (CaCO3) - primarily Aragonite or Calcite

Bog Iron (Limonite Concretion) (Limonite (FeO(OH)·nH2O)) — sedimentary

Bog Iron (Limonite Concretion)

Limonite (FeO(OH)·nH2O)

Pink Granite (Granite (Felsic Plutonic Rock)) — igneous

Pink Granite

Granite (Felsic Plutonic Rock)

Limitation Concretion (Ironstone Concretion (Goethite/Limonite)) — sedimentary

Limitation Concretion

Ironstone Concretion (Goethite/Limonite)

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Blue Apatite (Fluorapatite / Chlorapatite [Ca5(PO4)3(F,Cl,OH)]) — mineral

Blue Apatite

Fluorapatite / Chlorapatite [Ca5(PO4)3(F,Cl,OH)]

Anthracite Coal (Anthracite (Carbon-rich metamorphic coal)) — metamorphic

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

Ironstone Concretion (Siderite or Hematite-bonded Concretion) — sedimentary

Ironstone Concretion

Siderite or Hematite-bonded Concretion

Pink Coral (Corallium rubrum (or related species, composed of calcium carbonate)) — gemstone

Pink Coral

Corallium rubrum (or related species, composed of calcium carbonate)

Pyrite (Iron Disulfide (FeS2)) — mineral

Pyrite

Iron Disulfide (FeS2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Blue Apatite (Apatite group (Ca5(PO4)3(F,Cl,OH))) — mineral

Blue Apatite

Apatite group (Ca5(PO4)3(F,Cl,OH))

Ironstone Nodules / Siderite Concretion (Siderite (FeCO3) / Ferruginous Septarian Concretion) — sedimentary

Ironstone Nodules / Siderite Concretion

Siderite (FeCO3) / Ferruginous Septarian Concretion

Amber (Resinite / Fossilized Tree Resin) — mineral

Amber

Resinite / Fossilized Tree Resin

Green Calcite (Calcite (CaCO3)) — mineral

Green Calcite

Calcite (CaCO3)

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Quartz Geode (Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2)

Red Coral (Precious Coral) (Corallium rubrum (Calcium Carbonate, CaCO3)) — sedimentary

Red Coral (Precious Coral)

Corallium rubrum (Calcium Carbonate, CaCO3)

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Yellow Calcite (Calcium Carbonate (CaCO3)) — Mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

Dyed or treated turquoise-like tumbled stone (Likely turquoise (CuAl₆(PO₄)₄(OH)₈·4H₂O), though blue-green magnesite or howlite imitation is possible) — mineral

Dyed or treated turquoise-like tumbled stone

Likely turquoise (CuAl₆(PO₄)₄(OH)₈·4H₂O), though blue-green magnesite or howlite imitation is possible

Blue-green turquoise-like tumbled stone (Turquoise, hydrous copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O) — mineral

Blue-green turquoise-like tumbled stone

Turquoise, hydrous copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O

Blue-green fluorite crystal (Fluorite (calcium fluoride, CaF₂)) — mineral

Blue-green fluorite crystal

Fluorite (calcium fluoride, CaF₂)

Coarse-Grained Marble (Recrystallized Limestone (Major component: CaCO3)) — metamorphic

Coarse-Grained Marble

Recrystallized Limestone (Major component: CaCO3)

Freshwater Pearl (Aragonite / Biogenic Calcium Carbonate (CaCO3)) — mineral

Freshwater Pearl

Aragonite / Biogenic Calcium Carbonate (CaCO3)

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Emerald (Beryl (Be3Al2(SiO3)6)) — gemstone

Emerald

Beryl (Be3Al2(SiO3)6)

Naga Silver-Inlaid Ebony and Bone/Horn Beads (Diospyros (Ebony) or Keratin (Horn) with Silver/White-Metal Inlay) — Organic (Anthropological Artifact)

Naga Silver-Inlaid Ebony and Bone/Horn Beads

Diospyros (Ebony) or Keratin (Horn) with Silver/White-Metal Inlay

Organic (Anthropological Artifact)

Basalt (Basalt (comprising plagioclase, pyroxene, and olivine)) — igneous

Basalt

Basalt (comprising plagioclase, pyroxene, and olivine)

Iron-rich botryoidal limonite/goethite specimen (Limonite (amorphous hydrated iron oxides, chiefly goethite, α-FeO(OH))) — mineral

Iron-rich botryoidal limonite/goethite specimen

Limonite (amorphous hydrated iron oxides, chiefly goethite, α-FeO(OH))

Ammonite Fossil (Ammonoidea (subclass)) — sedimentary

Ammonite Fossil

Ammonoidea (subclass)

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Green Calcite (often commercially called Green Onyx) (Calcium Carbonate (CaCO3)) — Mineral

Green Calcite (often commercially called Green Onyx)

Calcium Carbonate (CaCO3)

Pegmatite (Granitic Pegmatite) — igneous

Pegmatite

Granitic Pegmatite

Brown Jasper (Likely) (Jasper (Cryptocrystalline Silicon Dioxide - SiO2)) — Mineral

Brown Jasper (Likely)

Jasper (Cryptocrystalline Silicon Dioxide - SiO2)

Basalt (Basalt (Mafic Extrusive Igneous Rock)) — igneous

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Vesicular Basalt (Vesicular Basalt) — igneous

Vesicular Basalt

Vesicular Basalt