Rock Identifier

Category

Anthropogenic Specimen (Man Made)

Browse anthropogenic specimen (man made) specimens identified by the Rock Identifier community.

Learn about Anthropogenic Specimen (Man Made) in the encyclopedia

Opalite

Emerald in Matrix

Emerald in Matrix

Morganite Crystal

Morganite Crystal

Emerald Crystal

Emerald Crystal

Aquamarine Matrix

Aquamarine Matrix

Aquamarine Crystal

Aquamarine Crystal

Mushroom Tourmaline

Mushroom Tourmaline

Map Jasper

Goldstone

Blue Goldstone

Mandarin Garnet

Mandarin Garnet

Andalusite

Likely weathered granite or granitic gneiss fragment (Granite; primarily quartz, feldspar, and mica) — igneous

Likely weathered granite or granitic gneiss fragment

Granite; primarily quartz, feldspar, and mica

Ferrosilicon Slag (Industrial Vitrified Glass) (Vitreous Silicate Residue) — Antropogenic (Man-made industrial byproduct)

Ferrosilicon Slag (Industrial Vitrified Glass)

Vitreous Silicate Residue

Antropogenic (Man-made industrial byproduct)

Obsidian (likely) (Volcanic glass; primarily silica-rich rhyolitic composition (approximately 70–75% SiO₂)) — igneous

Obsidian (likely)

Volcanic glass; primarily silica-rich rhyolitic composition (approximately 70–75% SiO₂)

Chert (Yellow Jasper/Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Brown Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Brown Chert

Microcrystalline Quartz (SiO2)

Granite (Pegmatitic) (Phaneritic Felsic Igneous Rock) — igneous

Granite (Pegmatitic)

Phaneritic Felsic Igneous Rock

Flint (or Chert with cortex) (Silicon dioxide (SiO2)) — sedimentary

Flint (or Chert with cortex)

Silicon dioxide (SiO2)

Fossil coral fragment (Fossilized colonial coral, commonly *Hexagonaria* (often called Petoskey stone) or related scleractinian/tabulate coral) — fossil

Fossil coral fragment

Fossilized colonial coral, commonly *Hexagonaria* (often called Petoskey stone) or related scleractinian/tabulate coral

Amber cabochon pendant (Amber (fossilized plant resin), chiefly polymerized diterpenoid resin) — gemstone

Amber cabochon pendant

Amber (fossilized plant resin), chiefly polymerized diterpenoid resin

Polished black stone carving, likely soapstone/steatite (Steatite (massive talc), Mg₃Si₄O₁₀(OH)₂; exact material cannot be confirmed from the image) — metamorphic

Polished black stone carving, likely soapstone/steatite

Steatite (massive talc), Mg₃Si₄O₁₀(OH)₂; exact material cannot be confirmed from the image

Chert (Jasper/Flint variety) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Polished dark gray stone, likely basalt or fine-grained andesite (Basalt/andesite; primarily plagioclase feldspar, pyroxene, and possibly olivine or magnetite) — igneous

Polished dark gray stone, likely basalt or fine-grained andesite

Basalt/andesite; primarily plagioclase feldspar, pyroxene, and possibly olivine or magnetite

Porous limestone (likely fossiliferous or weathered limestone) (Calcite-rich limestone; chiefly calcium carbonate (CaCO₃)) — sedimentary

Porous limestone (likely fossiliferous or weathered limestone)

Calcite-rich limestone; chiefly calcium carbonate (CaCO₃)

Diamond (as set in a metal alloy ring) (Diamond (Pure Carbon, C)) — mineral

Diamond (as set in a metal alloy ring)

Diamond (Pure Carbon, C)

Iron meteorite (likely an etched or weathered display specimen) (Iron meteorite, composed chiefly of kamacite and taenite (Fe–Ni alloys)) — meteorite

Iron meteorite (likely an etched or weathered display specimen)

Iron meteorite, composed chiefly of kamacite and taenite (Fe–Ni alloys)

Galena (lead sulfide) (Galena, PbS) — mineral

Galena (lead sulfide)

Galena, PbS

Unknown dark mineral/rock fragment (Indeterminate; possibly a dark sulfide mineral or slag-like geological fragment) — mineral

Unknown dark mineral/rock fragment

Indeterminate; possibly a dark sulfide mineral or slag-like geological fragment

Chalk (Micrite (primarily Calcium Carbonate, CaCO3)) — sedimentary

Chalk

Micrite (primarily Calcium Carbonate, CaCO3)

Chert (Common Variety, Jasper) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Common Variety, Jasper)

Microcrystalline Quartz (SiO2)

Moissanite (Silicon Carbide (SiC)) — mineral

Moissanite

Silicon Carbide (SiC)

Diorite (River Pebble) (Intermediate plutonic igneous rock) — igneous

Diorite (River Pebble)

Intermediate plutonic igneous rock

Petoskey Stone (Hexagonaria percarinata (Fossilized Rugose Coral)) — sedimentary (fossilized)

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

sedimentary (fossilized)

Likely gold-colored metal ring with a possible gemstone (Uncertain; possibly gold alloy (Au) with a small quartz or glass-like setting) — mineral

Likely gold-colored metal ring with a possible gemstone

Uncertain; possibly gold alloy (Au) with a small quartz or glass-like setting

Diamond (in Jewelry Setting) (Carbon (C)) — gemstone

Diamond (in Jewelry Setting)

Carbon (C)

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

Yellow Sapphire (Raw)

Corundum (Al2O3)

Quartzite (River Pebble) (Quartzite (Mainly SiO2)) — metamorphic

Quartzite (River Pebble)

Quartzite (Mainly SiO2)

Chert Pebble (Chert (Microcrystalline Quartz, SiO2)) — sedimentary

Chert Pebble

Chert (Microcrystalline Quartz, SiO2)

Asphalt Pavement (with aggregate) (Asphalt concrete) — man-made composite

Asphalt Pavement (with aggregate)

Asphalt concrete

man-made composite

Blue Goldstone (Aventurine Glass (SiO2 with Cobalt/Copper inclusions)) — man-made glass

Blue Goldstone

Aventurine Glass (SiO2 with Cobalt/Copper inclusions)

Granite Pebble (Felsic intrusive igneous rock) — igneous

Granite Pebble

Felsic intrusive igneous rock

Banded Sandstone (Arenite with Liesegang banding) — sedimentary

Banded Sandstone

Arenite with Liesegang banding

Blue glass-like tumbled specimen (Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image) — mineral

Blue glass-like tumbled specimen

Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image

Blue chalcedony cabochon (probable) (Chalcedony, a cryptocrystalline variety of quartz; silicon dioxide, SiO₂) — gemstone

Blue chalcedony cabochon (probable)

Chalcedony, a cryptocrystalline variety of quartz; silicon dioxide, SiO₂

Rough Corundum (Sapphire/Ruby mixture) (Corundum (Aluminum Oxide, Al2O3)) — mineral

Rough Corundum (Sapphire/Ruby mixture)

Corundum (Aluminum Oxide, Al2O3)

Quartz (Smoky Quartz variant) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Diamond (Cut Gemstone) (Natural Carbon (C)) — gemstone

Diamond (Cut Gemstone)

Natural Carbon (C)

Ferrochrome Slag (Industrial Glassy Slag (Fe-Cr alloy byproduct)) — Antropogenic (Man-made industrial byproduct)

Ferrochrome Slag

Industrial Glassy Slag (Fe-Cr alloy byproduct)

Antropogenic (Man-made industrial byproduct)

Rounded quartz pebble (Quartz (silicon dioxide, SiO₂)) — mineral

Rounded quartz pebble

Quartz (silicon dioxide, SiO₂)

Chert (Iron-stained) (Chert (Microcrystalline and Cryptocrystalline Quartz, SiO2)) — sedimentary

Chert (Iron-stained)

Chert (Microcrystalline and Cryptocrystalline Quartz, SiO2)

Jasper Marble (Silicon Dioxide (SiO2) with Impurities) — sedimentary

Jasper Marble

Silicon Dioxide (SiO2) with Impurities

Chalk (Calcium Carbonate (CaCO3)) — sedimentary

Chalk

Calcium Carbonate (CaCO3)

Chert (specifically Red Chert or Jasper) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (specifically Red Chert or Jasper)

Microcrystalline Quartz (SiO2)