Rock Identifier

Category

Mineraloid (Human Made Geological Specimen)

Browse mineraloid (human made geological specimen) specimens identified by the Rock Identifier community.

Pearl (Calcium carbonate (CaCO3) - mainly Aragonite with Conchiolin) — mineraloid

Pearl

Calcium carbonate (CaCO3) - mainly Aragonite with Conchiolin

Chert (specifically Flint) (Chert (SiO2)) — sedimentary

Chert (specifically Flint)

Chert (SiO2)

Granite (weathered pebble) (Granite (plutonic igneous rock)) — Igneous

Granite (weathered pebble)

Granite (plutonic igneous rock)

Painted Sandstone (Sandstone (clastic sedimentary rock) with acrylic/artistic coating) — sedimentary

Painted Sandstone

Sandstone (clastic sedimentary rock) with acrylic/artistic coating

Limonite Concretion (Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)) — sedimentary

Limonite Concretion

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

Obsidian (Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)) — igneous

Obsidian

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

Note: Item is not a geological specimen (Guitar Components (Steel, Nickel, Plastic, Wood)) — Synthetic/Consumer Product

Note: Item is not a geological specimen

Guitar Components (Steel, Nickel, Plastic, Wood)

Synthetic/Consumer Product

Polished white chalcedony or milky quartz pebble (Chalcedony, microcrystalline quartz (SiO₂), possibly with iron-oxide staining or a minor mineral inclusion) — mineral

Polished white chalcedony or milky quartz pebble

Chalcedony, microcrystalline quartz (SiO₂), possibly with iron-oxide staining or a minor mineral inclusion

Selenite (gypsum) (Gypsum, CaSO₄·2H₂O; variety commonly called satin spar or selenite) — mineral

Selenite (gypsum)

Gypsum, CaSO₄·2H₂O; variety commonly called satin spar or selenite

Tumbled light-colored stone, possibly quartzite or limestone (Indeterminate; likely quartzite (mostly SiO₂) or calcitic limestone (CaCO₃)) — metamorphic

Tumbled light-colored stone, possibly quartzite or limestone

Indeterminate; likely quartzite (mostly SiO₂) or calcitic limestone (CaCO₃)

Green glass-like cabochon, likely synthetic glass or resin (Unidentified green transparent material; possibly molded glass, synthetic spinel, or resin) — gemstone

Green glass-like cabochon, likely synthetic glass or resin

Unidentified green transparent material; possibly molded glass, synthetic spinel, or resin

Opalite (Synthetic Glass (Amorphized Silicon Dioxide)) — mineraloid

Opalite

Synthetic Glass (Amorphized Silicon Dioxide)

Cullet Glass (Slag Glass) (Amorphous Silicon Dioxide (Industrial Man-made)) — mineraloid

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial Man-made)

Dyed Quartz (often sold as 'Blue Quartz' or 'Blue Agate') (Silicon Dioxide (SiO2) with artificial pigment) — mineral

Dyed Quartz (often sold as 'Blue Quartz' or 'Blue Agate')

Silicon Dioxide (SiO2) with artificial pigment

Flint / Chert (Microcrystalline quartz (SiO2)) — sedimentary

Flint / Chert

Microcrystalline quartz (SiO2)

Dyed Pumice (Vesicular Rhyolite (Artificial Coloration Addition)) — igneous

Dyed Pumice

Vesicular Rhyolite (Artificial Coloration Addition)

Opalite (Man-made Glass (Synthetic Opalized Glass)) — mineral

Opalite

Man-made Glass (Synthetic Opalized Glass)

Goldstone and Aura Quartz (Cuprous Glass (Goldstone) and Titanium-coated SiO2 (Aura Quartz)) — Mineral/Glass Specimen

Goldstone and Aura Quartz

Cuprous Glass (Goldstone) and Titanium-coated SiO2 (Aura Quartz)

Mineral/Glass Specimen

Opalite (Man-made opalescent glass) — gemstone

Opalite

Man-made opalescent glass

Chert (Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline Quartz (SiO2)

Titanium-coated Metal Cube (Man-made Fidget Toy) (Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)) — Mineral alternative / Synthetic

Titanium-coated Metal Cube (Man-made Fidget Toy)

Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)

Mineral alternative / Synthetic

Pearl (Aragonite / Calcium Carbonate (CaCO3)) — mineraloid

Pearl

Aragonite / Calcium Carbonate (CaCO3)

Hand-Drawn Gengar Pokémon Card Artist Item (Lignocellulosic Fiber (Cellulose, C6H10O5) with wax-based pigment (crayon/colored pencil)) — Organic (Paper and Cellulose)

Hand-Drawn Gengar Pokémon Card Artist Item

Lignocellulosic Fiber (Cellulose, C6H10O5) with wax-based pigment (crayon/colored pencil)

Organic (Paper and Cellulose)

Chert / Flint (Arrowhead Artifact) (Microcrystalline quartz (SiO2)) — sedimentary

Chert / Flint (Arrowhead Artifact)

Microcrystalline quartz (SiO2)

Aura Quartz (Anomalously Coated Quartz) (Silicon Dioxide (SiO2) treated with vaporized metals) — mineral

Aura Quartz (Anomalously Coated Quartz)

Silicon Dioxide (SiO2) treated with vaporized metals

Exposed Aggregate Concrete (Pea Gravel) (Concrete with Siliceous Alluvial Gravels) — sedimentary (man-made conglomerate)

Exposed Aggregate Concrete (Pea Gravel)

Concrete with Siliceous Alluvial Gravels

sedimentary (man-made conglomerate)

Chert (Flint) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Polished blue calcite sphere (tentative identification) (Calcite, CaCO₃; blue color generally results from trace impurities or inclusions) — mineral

Polished blue calcite sphere (tentative identification)

Calcite, CaCO₃; blue color generally results from trace impurities or inclusions

Dragon's Breath (Mexican Opal Glass) (Artisan Foil Glass (SiO2 based)) — mineraloid

Dragon's Breath (Mexican Opal Glass)

Artisan Foil Glass (SiO2 based)

Opalite (Synthetic Opalised Glass) — glass

Opalite

Synthetic Opalised Glass

Black Pearl (Tahitian or Irradiated Type) (Organic gemstone (Calcium Carbonate with Conchiolin Binding)) — mineraloid

Black Pearl (Tahitian or Irradiated Type)

Organic gemstone (Calcium Carbonate with Conchiolin Binding)

Engraved polished dark stone (likely slate or basalt) (Probable fine-grained slate (microcrystalline phyllosilicates), possibly basalt; exact identification requires testing) — metamorphic

Engraved polished dark stone (likely slate or basalt)

Probable fine-grained slate (microcrystalline phyllosilicates), possibly basalt; exact identification requires testing

Opalite (Synthetic Glass (Silica-based)) — gemstone

Opalite

Synthetic Glass (Silica-based)

Tumbled milky quartz (Quartz, silicon dioxide (SiO₂)) — mineral

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

Limonite and Goethite (Ironstone) (Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)) — sedimentary

Limonite and Goethite (Ironstone)

Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)

Pearl (Biogenic Mineraloid) (Calcium carbonate (CaCO3) primarily as Aragonite) — mineral

Pearl (Biogenic Mineraloid)

Calcium carbonate (CaCO3) primarily as Aragonite

Chert (Flint) (SiO2 (Microcrystalline Quartz)) — sedimentary

Chert (Flint)

SiO2 (Microcrystalline Quartz)

Blue Goldstone (Man-made glass with crystalline copper/cobalt inclusions) — mineral

Blue Goldstone

Man-made glass with crystalline copper/cobalt inclusions

Chert (Flint) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Concrete Rubble with Aggregate (Hardened Portland Cement Paste with Coarse Aggregate) — Anthropogenic (Man-made)

Concrete Rubble with Aggregate

Hardened Portland Cement Paste with Coarse Aggregate

Anthropogenic (Man-made)

Pearl-embellished decorative cross (Pearl (biogenic calcium carbonate, predominantly aragonite) with rhinestone-mounted glass or synthetic gemstones) — gemstone

Pearl-embellished decorative cross

Pearl (biogenic calcium carbonate, predominantly aragonite) with rhinestone-mounted glass or synthetic gemstones

Asphalt (Road Aggregate) (Asphalt concrete / Bituminous mixture) — anthropogenic sedimentary (technolith)

Asphalt (Road Aggregate)

Asphalt concrete / Bituminous mixture

anthropogenic sedimentary (technolith)