Rock Identifier

Category

Man Made Object (Coin)

Browse man made object (coin) specimens identified by the Rock Identifier community.

Learn about Man Made Object (Coin) in the encyclopedia

Opalite

Goldstone

Map Jasper

Blue Goldstone

Mandarin Garnet

Mandarin Garnet

Andalusite

Zincite

Marl

Dunite

Coquina

Dalmatian Jasper

Dalmatian Jasper

Chalk

Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone) (Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)) — mineral (synthetic)

Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)

Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)

mineral (synthetic)

Silver (Morgan Dollar) (Native Silver (Ag) - 90% Silver, 10% Copper alloy) — mineral

Silver (Morgan Dollar)

Native Silver (Ag) - 90% Silver, 10% Copper alloy

Stichtite in Serpentine (Atlantisite) (Mg6Cr2CO3(OH)16·4H2O (Stichtite) within Mg3Si2O5(OH)4 (Serpentine)) — Metamorphic

Stichtite in Serpentine (Atlantisite)

Mg6Cr2CO3(OH)16·4H2O (Stichtite) within Mg3Si2O5(OH)4 (Serpentine)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Limestone (Calcitic Limestone (CaCO3)) — sedimentary

Limestone

Calcitic Limestone (CaCO3)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Fluorite (specifically Blue John or Banded Fluorite) (Calcium Fluoride (CaF2)) — mineral

Fluorite (specifically Blue John or Banded Fluorite)

Calcium Fluoride (CaF2)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Bornite (Bornite (Cu5FeS4)) — mineral

Bornite

Bornite (Cu5FeS4)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Limestone (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Limestone (specifically Marl or Chalk) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (specifically Marl or Chalk)

Calcium Carbonate (CaCO3)

Rough Green Calcite (Calcite (Calcium Carbonate, CaCO3)) — mineral

Rough Green Calcite

Calcite (Calcium Carbonate, CaCO3)

Native Gold (in the form of jewelry) (Gold (Au)) — mineral

Native Gold (in the form of jewelry)

Gold (Au)

Limestone with Iron Inclusions (Calcium Carbonate (CaCO3) with Hematite/Limonite) — sedimentary

Limestone with Iron Inclusions

Calcium Carbonate (CaCO3) with Hematite/Limonite

Buffalo Nickel (Indian Head Nickel) (Cupronickel (75% Copper, 25% Nickel)) — mineral (processed alloy)

Buffalo Nickel (Indian Head Nickel)

Cupronickel (75% Copper, 25% Nickel)

mineral (processed alloy)

Silver (Native Element) (Ag (Native Silver), with minor Copper (Cu)) — mineral

Silver (Native Element)

Ag (Native Silver), with minor Copper (Cu)

Green glassy mineral specimen, likely rough emerald or green fluorite (Tentatively beryl (Be₃Al₂Si₆O₁₈), emerald variety; synthetic/man-made glass cannot be excluded from the photograph) — mineral

Green glassy mineral specimen, likely rough emerald or green fluorite

Tentatively beryl (Be₃Al₂Si₆O₁₈), emerald variety; synthetic/man-made glass cannot be excluded from the photograph

Travertine (likely polished limestone) (Calcite-rich carbonate rock; predominantly CaCO₃) — sedimentary

Travertine (likely polished limestone)

Calcite-rich carbonate rock; predominantly CaCO₃

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Diamond (Carbon (C)) — gemstone

Diamond

Carbon (C)

Rough Diamond (Native Carbon (C)) — mineral

Rough Diamond

Native Carbon (C)

Diamond (in a cluster setting) (Crystallized Carbon (C)) — mineral

Diamond (in a cluster setting)

Crystallized Carbon (C)

Crinoid Fossil in Limestone (Crinoid (Class Crinoidea) in Fossiliferous Limestone (CaCO3)) — sedimentary

Crinoid Fossil in Limestone

Crinoid (Class Crinoidea) in Fossiliferous Limestone (CaCO3)

White Marble (Recrystallized Calcite (CaCO3)) — metamorphic

White Marble

Recrystallized Calcite (CaCO3)

Orange-yellow calcite crystal (Calcite (CaCO₃), likely honey/orange calcite) — mineral

Orange-yellow calcite crystal

Calcite (CaCO₃), likely honey/orange calcite

Green Fluorite (Calcium Fluoride (CaF2)) — mineral

Green Fluorite

Calcium Fluoride (CaF2)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Banded Calcite (often sold as Onyx Marble) (Calcite (Calcium Carbonate, CaCO3)) — sedimentary

Banded Calcite (often sold as Onyx Marble)

Calcite (Calcium Carbonate, CaCO3)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Pyrite (Iron Disulfide (FeS2)) — mineral

Pyrite

Iron Disulfide (FeS2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

General Rock and Mineral Collection (Center: Angelite / Blue Anhydrite) (Anhydrite (Calcium Sulfate, CaSO4)) — Mineral

General Rock and Mineral Collection (Center: Angelite / Blue Anhydrite)

Anhydrite (Calcium Sulfate, CaSO4)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Limestone (Micrite/Chalky variety) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (Micrite/Chalky variety)

Calcium Carbonate (CaCO3)

Pyrite (or Fool's Gold) (Pyrite (FeS₂)) — Mineral

Pyrite (or Fool's Gold)

Pyrite (FeS₂)

Corundum (Sapphire/Ruby in Matrix) (Corundum (Al2O3)) — mineral

Corundum (Sapphire/Ruby in Matrix)

Corundum (Al2O3)