Rock Identifier

Category

Organic (Geological Relative)

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

Amber (Succinite (fossilized resin)) — mineral

Amber

Succinite (fossilized resin)

Geode (Unopened) (Crystalline Quartz or Chalcedony filled Geode (SiO2)) — sedimentary

Geode (Unopened)

Crystalline Quartz or Chalcedony filled Geode (SiO2)

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Amber (Dark/Black Variety) (Succinite (Resinite), C10H16O) — mineral

Amber (Dark/Black Variety)

Succinite (Resinite), C10H16O

Basalt (Mafic extrusive igneous rock) — igneous

Basalt

Mafic extrusive igneous rock

Amber (Copal) (Organic gemstone, fossilized tree resin (often immature amber or copal)) — Mineral

Amber (Copal)

Organic gemstone, fossilized tree resin (often immature amber or copal)

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

Blue Apatite

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

Honey Calcite Sphere (Calcium Carbonate (CaCO3)) — mineral

Honey Calcite Sphere

Calcium Carbonate (CaCO3)

Chert in Limestone (or Flint Nodule) (Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)) — sedimentary

Chert in Limestone (or Flint Nodule)

Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)

Goniatite Fossil (Order Goniatitida) — fossil

Goniatite Fossil

Order Goniatitida

Fossil Shark Tooth Fragment (Elasmobranchii dentition (fragment)) — fossil

Fossil Shark Tooth Fragment

Elasmobranchii dentition (fragment)

Orange Calcite (Calcite (Calcium Carbonate, CaCO3)) — mineral

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

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

Moqui Marble (Ironstone Concretion)

Iron Oxide Concretion (Fe2O3 / FeO(OH))

Anthracite Coal (Anthracite) — metamorphic

Anthracite Coal

Anthracite

Basalt (Mafic extrusive igneous rock) — igneous

Basalt

Mafic extrusive igneous rock

Quartz pebble or seed/crumb (SiO2 (if quartz)) — mineral

Quartz pebble or seed/crumb

SiO2 (if quartz)

Green Aventurine (Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)) — mineral

Green Aventurine

Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Quartz with Magnetite or Schorl inclusion (Silicon Dioxide (SiO2) with Fe3O4 or NaFe3(Al6)(BO3)3Si6O18(OH)4) — metamorphic

Quartz with Magnetite or Schorl inclusion

Silicon Dioxide (SiO2) with Fe3O4 or NaFe3(Al6)(BO3)3Si6O18(OH)4

Basalt (Basalt) — igneous

Basalt

Basalt

Moqui Marble (Iron Oxide Concretion (Hematite/Goethite-cemented Sandstone)) — sedimentary

Moqui Marble

Iron Oxide Concretion (Hematite/Goethite-cemented Sandstone)

Basalt (River Pebble) (Basalt) — igneous

Basalt (River Pebble)

Basalt

Banded Calcite (often sold as Mexican Onyx) (Calcium Carbonate (CaCO3)) — mineral

Banded Calcite (often sold as Mexican Onyx)

Calcium Carbonate (CaCO3)

Fossilized Sand Dollar (Echinoidea (Clypeasteroida)) — fossil

Fossilized Sand Dollar

Echinoidea (Clypeasteroida)

Limonite (Iron Ore / Ochre) (Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore / Ochre)

Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)

Limonite Concretion (Goethite-Limonite (FeO(OH)·nH2O)) — sedimentary

Limonite Concretion

Goethite-Limonite (FeO(OH)·nH2O)

Vesicular Basalt (Scoria) (Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)) — igneous

Vesicular Basalt (Scoria)

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Likely slate or fine-grained metamorphic rock (Slate/phyllite; predominantly fine-grained mica, chlorite, and quartz) — metamorphic

Likely slate or fine-grained metamorphic rock

Slate/phyllite; predominantly fine-grained mica, chlorite, and quartz

Chert Nodules in Limestone (Microcrystalline Quartz (SiO2) in Carbonate Matrix) — sedimentary

Chert Nodules in Limestone

Microcrystalline Quartz (SiO2) in Carbonate Matrix

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

Limonite Concretion

Goethite/Limonite (FeO(OH)·nH2O)

Blue Aragonite (polished) (Aragonite (CaCO3)) — mineral

Blue Aragonite (polished)

Aragonite (CaCO3)

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Pyrite with Iron Oxides (Fool's Gold in Matrix) (Iron Sulfide (FeS2)) — mineral

Pyrite with Iron Oxides (Fool's Gold in Matrix)

Iron Sulfide (FeS2)

Basalt (Basalt) — Igneous

Basalt

Basalt

Ironstone Concretion / Limonite Node (Ferruginous Sedimentary Rock (composed primarily of Limonite FeO(OH)·nH2O and Goethite)) — sedimentary

Ironstone Concretion / Limonite Node

Ferruginous Sedimentary Rock (composed primarily of Limonite FeO(OH)·nH2O and Goethite)

Ironstone Concretion (Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)) — sedimentary

Ironstone Concretion

Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)

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

Howlite

Howlite, Ca₂B₅SiO₉(OH)₅

Green copper-mineral specimen, likely chrysocolla or copper-bearing serpentine (Tentatively chrysocolla (hydrated copper phyllosilicate, approximately (Cu,Al)2H2Si2O5(OH)4·nH2O); exact identification requires testing) — mineral

Green copper-mineral specimen, likely chrysocolla or copper-bearing serpentine

Tentatively chrysocolla (hydrated copper phyllosilicate, approximately (Cu,Al)2H2Si2O5(OH)4·nH2O); exact identification requires testing

Vesicular Basalt (Lava Rock) (Vesicular basalt) — igneous

Vesicular Basalt (Lava Rock)

Vesicular basalt

Basalt (Vesicular) (Extrusive mafic igneous rock) — igneous

Basalt (Vesicular)

Extrusive mafic igneous rock

Horse Chestnut (Buckeye seed) (Aesculus hippocastanum seed) — Organic (Non-geological)

Horse Chestnut (Buckeye seed)

Aesculus hippocastanum seed

Organic (Non-geological)

Moqui Marble (Ironstone Concretion (Ferruginous sandstone)) — sedimentary

Moqui Marble

Ironstone Concretion (Ferruginous sandstone)

Soil with Mineral Detritus and Quartz Fragments (Regolith / Silicate Mineral Aggregate) — sedimentary

Soil with Mineral Detritus and Quartz Fragments

Regolith / Silicate Mineral Aggregate