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

Map Jasper

Goldstone

Blue Goldstone

Mandarin Garnet

Mandarin Garnet

Andalusite

Zincite

Marl

Coquina

Dunite

Dalmatian Jasper

Dalmatian Jasper

Rock Gypsum

Blue Calcite (Calcium Carbonate (CaCO3)) — mineral

Blue Calcite

Calcium Carbonate (CaCO3)

Calcite (Calcium Carbonate (CaCO3)) — mineral

Calcite

Calcium Carbonate (CaCO3)

Yellow Calcite (Calcium Carbonate (CaCO3)) — mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Fluorite (tumbled pebble) (Calcium Fluoride (CaF2)) — mineral

Fluorite (tumbled pebble)

Calcium Fluoride (CaF2)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Cut colorless gemstone, likely quartz or glass imitation (Most plausibly rock crystal (clear quartz, SiO₂); synthetic glass cannot be ruled out from the image) — gemstone

Cut colorless gemstone, likely quartz or glass imitation

Most plausibly rock crystal (clear quartz, SiO₂); synthetic glass cannot be ruled out from the image

Small polished metallic mineral specimen (Indeterminate from image; possibly galena or hematite) — mineral

Small polished metallic mineral specimen

Indeterminate from image; possibly galena or hematite

Ammonite fossil (Fossilized ammonoid cephalopod; likely an involute ammonite, exact genus/species indeterminate) — fossil

Ammonite fossil

Fossilized ammonoid cephalopod; likely an involute ammonite, exact genus/species indeterminate

Banded Calcite or Travertine (Calcium Carbonate (CaCO3)) — Sedimentary

Banded Calcite or Travertine

Calcium Carbonate (CaCO3)

Speckled rounded stone, possibly basalt or diorite (Indeterminate mafic/intermediate igneous rock; likely fine-grained basaltic or dioritic material) — igneous

Speckled rounded stone, possibly basalt or diorite

Indeterminate mafic/intermediate igneous rock; likely fine-grained basaltic or dioritic material

Fossilized bivalve in sandstone/conglomerate (Indeterminate fossil mollusk, likely Bivalvia, preserved in lithified siliciclastic sediment) — fossil

Fossilized bivalve in sandstone/conglomerate

Indeterminate fossil mollusk, likely Bivalvia, preserved in lithified siliciclastic sediment

Blue slag glass / industrial smelter slag (Man-made iron-rich silicate slag; composition variable, commonly Fe–Ca–Mg–Al silicates with glassy phases) — mineral

Blue slag glass / industrial smelter slag

Man-made iron-rich silicate slag; composition variable, commonly Fe–Ca–Mg–Al silicates with glassy phases

Limestone Gravel (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone Gravel

Sedimentary Calcium Carbonate (CaCO3)

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

Banded Calcite (Honey Calcite)

Calcium Carbonate (CaCO3)

Honey Calcite (Calcium Carbonate (CaCO3)) — mineral

Honey Calcite

Calcium Carbonate (CaCO3)

Fuchsite (Cr-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)) — mineral

Fuchsite

Cr-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Honey calcite crystal (Calcite (calcium carbonate, CaCO₃)) — mineral

Honey calcite crystal

Calcite (calcium carbonate, CaCO₃)

Raw honey calcite (Calcite (calcium carbonate, CaCO₃)) — mineral

Raw honey calcite

Calcite (calcium carbonate, CaCO₃)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Milky calcite specimen (Calcite (calcium carbonate, CaCO₃)) — mineral

Milky calcite specimen

Calcite (calcium carbonate, CaCO₃)

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

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

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

Fluorite (Green)

Calcium Fluoride (CaF2)

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

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Tumbled orange chalcedony or quartzite (Microcrystalline quartz (SiO₂), possibly iron-stained chalcedony; exact identification requires testing) — mineral

Tumbled orange chalcedony or quartzite

Microcrystalline quartz (SiO₂), possibly iron-stained chalcedony; exact identification requires testing

Polished agate/geode fragment (Chalcedony (microcrystalline quartz, SiO₂) with quartz and probable iron/manganese oxides) — mineral

Polished agate/geode fragment

Chalcedony (microcrystalline quartz, SiO₂) with quartz and probable iron/manganese oxides

Tumbled labradorite (Labradorite, a calcium-rich plagioclase feldspar (approximately NaAlSi₃O₈–CaAl₂Si₂O₈)) — mineral

Tumbled labradorite

Labradorite, a calcium-rich plagioclase feldspar (approximately NaAlSi₃O₈–CaAl₂Si₂O₈)

Coprolite (Coprolite (fossilized feces)) — fossil

Coprolite

Coprolite (fossilized feces)

Fossil tooth, likely shark tooth (Fossilized selachian tooth, possibly Carcharodon or a related lamniform shark) — fossil

Fossil tooth, likely shark tooth

Fossilized selachian tooth, possibly Carcharodon or a related lamniform shark

Optical Calcite (Calcium Carbonate (CaCO3)) — mineral

Optical Calcite

Calcium Carbonate (CaCO3)

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

Quartz pebble or seed/crumb

SiO2 (if quartz)

Yellow calcite (likely polished/tumbled) (Calcite, calcium carbonate (CaCO₃)) — mineral

Yellow calcite (likely polished/tumbled)

Calcite, calcium carbonate (CaCO₃)

Malachite-bearing decorative stone (possibly dyed or resin-coated) (Malachite, Cu₂CO₃(OH)₂; the underlying matrix is not identifiable from the image) — mineral

Malachite-bearing decorative stone (possibly dyed or resin-coated)

Malachite, Cu₂CO₃(OH)₂; the underlying matrix is not identifiable from the image

Yellow Sapphire (Raw) (Corundum (Al2O3)) — mineral

Yellow Sapphire (Raw)

Corundum (Al2O3)

Chert (possibly a worked stone flake) (Microcrystalline quartz, SiO₂) — sedimentary

Chert (possibly a worked stone flake)

Microcrystalline quartz, SiO₂

Sea Glass (Amorphous Silicon Dioxide (SiO2)) — Mineral/Man-made

Sea Glass

Amorphous Silicon Dioxide (SiO2)

Mineral/Man-made

Crackle Glass (Simulated Gemstone) (Amorphous Solid (SiO2)) — man-made glass

Crackle Glass (Simulated Gemstone)

Amorphous Solid (SiO2)

Blue Goldstone (Synthetic glass with copper or cobalt/manganese inclusions) — man-made glass

Blue Goldstone

Synthetic glass with copper or cobalt/manganese inclusions

Blue Goldstone (Synthetic Aventurescent Glass (Cobalt-doped soda-lime glass)) — man-made glass

Blue Goldstone

Synthetic Aventurescent Glass (Cobalt-doped soda-lime glass)

Blue Goldstone (Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)) — man-made glass

Blue Goldstone

Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)