Rock Identifier

Category

Organic (Geological Relative)

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

Basalt (Basalt) — igneous

Basalt

Basalt

Tumbled turquoise (Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O) — mineral

Tumbled turquoise

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

Black tourmaline (likely schorl) (Schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄) — mineral

Black tourmaline (likely schorl)

Schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Weathered iron-rich rock, likely limonite/goethite-bearing basalt or ironstone (Limonite (hydrated iron oxides; chiefly goethite, FeO(OH)) with probable silicate host rock) — mineral

Weathered iron-rich rock, likely limonite/goethite-bearing basalt or ironstone

Limonite (hydrated iron oxides; chiefly goethite, FeO(OH)) with probable silicate host rock

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Pink Coral (Corallium rubrum (Calcium Carbonate, CaCO3)) — mineral

Pink Coral

Corallium rubrum (Calcium Carbonate, CaCO3)

Anthracite Coal (Anthracite (Carbon rank)) — sedimentary

Anthracite Coal

Anthracite (Carbon rank)

Likely aragonite crystal cluster (Aragonite, CaCO₃) — mineral

Likely aragonite crystal cluster

Aragonite, CaCO₃

Iron-rich rock, possibly limonite/goethite-bearing quartz or weathered ironstone (Limonite (FeO(OH)·nH₂O), commonly mixed with goethite (α-FeO(OH)) and quartz) — mineral

Iron-rich rock, possibly limonite/goethite-bearing quartz or weathered ironstone

Limonite (FeO(OH)·nH₂O), commonly mixed with goethite (α-FeO(OH)) and quartz

Tumbled malachite (probable) (Malachite, Cu₂CO₃(OH)₂) — mineral

Tumbled malachite (probable)

Malachite, Cu₂CO₃(OH)₂

Likely rough feldspar-bearing granite or pegmatite fragment (Granite/pegmatite; chiefly quartz (SiO₂), feldspar, and minor mica) — igneous

Likely rough feldspar-bearing granite or pegmatite fragment

Granite/pegmatite; chiefly quartz (SiO₂), feldspar, and minor mica

Raw turquoise-bearing rock (Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O, likely in a quartz/host-rock matrix) — mineral

Raw turquoise-bearing rock

Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O, likely in a quartz/host-rock matrix

White Howlite (likely) (Howlite, Ca₂B₅SiO₉(OH)₅) — mineral

White Howlite (likely)

Howlite, Ca₂B₅SiO₉(OH)₅

Ironstone / limonite-rich rock (Limonite, chiefly hydrated iron oxides (FeO(OH)·nH₂O), commonly mixed with goethite and hematite) — mineral

Ironstone / limonite-rich rock

Limonite, chiefly hydrated iron oxides (FeO(OH)·nH₂O), commonly mixed with goethite and hematite

Limonite Geode (Ironstone Concretion) (Goethite/Limonite FeO(OH)·nH2O) — sedimentary

Limonite Geode (Ironstone Concretion)

Goethite/Limonite FeO(OH)·nH2O

Green fluorite (likely) (Fluorite, calcium fluoride (CaF₂)) — mineral

Green fluorite (likely)

Fluorite, calcium fluoride (CaF₂)

Anthracite Coal (Anthracite) — sedimentary

Anthracite Coal

Anthracite

Tumbled serpentine (Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; approximately Mg₃Si₂O₅(OH)₄) — metamorphic

Tumbled serpentine

Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; approximately Mg₃Si₂O₅(OH)₄

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Ironstone Concretion (Limonite/Goethite) (Goethite-rich Concretion (FeO(OH))) — sedimentary

Ironstone Concretion (Limonite/Goethite)

Goethite-rich Concretion (FeO(OH))

Volcanic Tuff (Breccia) (Pyroclastic Tuffaceous Rock) — igneous

Volcanic Tuff (Breccia)

Pyroclastic Tuffaceous Rock

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

Basalt (Vesicular)

Extrusive igneous rock with vesicular texture

Green Fluorite (Fluorite (Calcium Fluoride, CaF2)) — mineral

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Basalt (Mafic volcanic rock (primarily plagioclase, pyroxene, and olivine)) — Igneous

Basalt

Mafic volcanic rock (primarily plagioclase, pyroxene, and olivine)

Fossilized bivalve shell fragment (Pectinid or related scallop bivalve; shell originally composed mainly of calcite (CaCO₃)) — fossil

Fossilized bivalve shell fragment

Pectinid or related scallop bivalve; shell originally composed mainly of calcite (CaCO₃)

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)

Fluorite (Fluorite (Calcium Fluoride, CaF2)) — Mineral

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Pink druzy quartz (possibly quartz-bearing calcite) (Quartz, SiO₂; the pale pink coloration may reflect iron impurities or included feldspar. Exact identification is uncertain from the image alone.) — mineral

Pink druzy quartz (possibly quartz-bearing calcite)

Quartz, SiO₂; the pale pink coloration may reflect iron impurities or included feldspar. Exact identification is uncertain from the image alone.

Tumbled turquoise (Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O) — gemstone

Tumbled turquoise

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Malachite-bearing rock (Malachite, Cu₂CO₃(OH)₂, likely with chrysocolla or matrix minerals) — mineral

Malachite-bearing rock

Malachite, Cu₂CO₃(OH)₂, likely with chrysocolla or matrix minerals

Small polished dark-blue stone, likely sodalite or blue aventurine (Probable sodalite (Na8(Al6Si6O24)Cl2); identification is uncertain from the image) — mineral

Small polished dark-blue stone, likely sodalite or blue aventurine

Probable sodalite (Na8(Al6Si6O24)Cl2); identification is uncertain from the image

Tumbled blue-green chrysocolla (likely chrysocolla with quartz) (Chrysocolla, hydrated copper aluminum silicate; commonly intergrown with quartz, Cu₂H₂Si₂O₅(OH)₄) — mineral

Tumbled blue-green chrysocolla (likely chrysocolla with quartz)

Chrysocolla, hydrated copper aluminum silicate; commonly intergrown with quartz, Cu₂H₂Si₂O₅(OH)₄

Malachite-bearing copper ore (Malachite, Cu₂CO₃(OH)₂, likely mixed with chrysocolla, copper minerals, and iron oxides) — mineral

Malachite-bearing copper ore

Malachite, Cu₂CO₃(OH)₂, likely mixed with chrysocolla, copper minerals, and iron oxides

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

Seashell Fragment

Calcium carbonate (CaCO3) - primarily Aragonite or Calcite

Cockle Shell (Bivalve) (Cardiidae (Calcium Carbonate, CaCO3)) — fossil

Cockle Shell (Bivalve)

Cardiidae (Calcium Carbonate, CaCO3)

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

Brown Jasper (Likely)

Jasper (Cryptocrystalline Silicon Dioxide - SiO2)

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

Bog Iron (Limonite Concretion)

Limonite (FeO(OH)·nH2O)

Geode / Agate Nodule (Silicon Dioxide (SiO2)) — mineral

Geode / Agate Nodule

Silicon Dioxide (SiO2)

Ironstone Concretion (Moqui Marble) (Iron-oxide concretion (Fe2O3 / FeO(OH))) — sedimentary

Ironstone Concretion (Moqui Marble)

Iron-oxide concretion (Fe2O3 / FeO(OH))

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

Pink Coral

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

Malachite specimen (Malachite, Cu₂CO₃(OH)₂) — mineral

Malachite specimen

Malachite, Cu₂CO₃(OH)₂

Amber (Resinite / Fossilized Tree Resin) — mineral

Amber

Resinite / Fossilized Tree Resin