Rock Identifier

Category

Anthropogenic Material

Browse anthropogenic material specimens identified by the Rock Identifier community.

Learn about Anthropogenic Material in the encyclopedia

Peat

Dunite

Limonite

Shell Opal

Madagascar Opal

Lavender Obsidian

Electric Blue Obsidian

Orange Obsidian

Diamond

Metarhyolite

Rhodochrosite

Peacock Opal

Polished turquoise-colored stone, likely chrysoprase or dyed agate (Uncertain; possible chalcedony (microcrystalline SiO₂) or turquoise (hydrous copper aluminum phosphate)) — mineral

Polished turquoise-colored stone, likely chrysoprase or dyed agate

Uncertain; possible chalcedony (microcrystalline SiO₂) or turquoise (hydrous copper aluminum phosphate)

Tumbled ruby in matrix (Corundum (Al₂O₃), commonly with mica, calcite, or other matrix minerals) — gemstone

Tumbled ruby in matrix

Corundum (Al₂O₃), commonly with mica, calcite, or other matrix minerals

Ruby in Zoisite (Anyolite) or possibly a dyed stone/agate (Anyolite (Ruby in green zoisite) or artificially altered chalcedony) — metamorphic

Ruby in Zoisite (Anyolite) or possibly a dyed stone/agate

Anyolite (Ruby in green zoisite) or artificially altered chalcedony

Quartz (Chert/Flint variety) (Silicon Dioxide (SiO2)) — sedimentary

Quartz (Chert/Flint variety)

Silicon Dioxide (SiO2)

Chert / Flint (Silicon dioxide (Microcrystalline Quartz, $SiO_2$)) — sedimentary

Chert / Flint

Silicon dioxide (Microcrystalline Quartz, $SiO_2$)

Chondrite Meteorite (Stony Meteorite (Ordinary Chondrite)) — meteorite

Chondrite Meteorite

Stony Meteorite (Ordinary Chondrite)

Amber (Succiniferous organic material (Succinite)) — fossil

Amber

Succiniferous organic material (Succinite)

Asphalt (Bituminous Rock) (Natural bitumen or Bituminous limestone/sandstone) — sedimentary

Asphalt (Bituminous Rock)

Natural bitumen or Bituminous limestone/sandstone

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

Asphalt Pavement (with aggregate)

Asphalt concrete

man-made composite

Greenstone (Epidosite) (Epidosite (Metamorphosed Basalt/Diabase)) — metamorphic

Greenstone (Epidosite)

Epidosite (Metamorphosed Basalt/Diabase)

Limestone or Sandstone Cobble (Sedimentary rock (Calcium carbonate or Quartz based)) — sedimentary

Limestone or Sandstone Cobble

Sedimentary rock (Calcium carbonate or Quartz based)

Quartz Vein in River Siltstone (Crystalline Quartz (SiO2) in Siliclastic Matrix) — sedimentary

Quartz Vein in River Siltstone

Crystalline Quartz (SiO2) in Siliclastic Matrix

Pumice or Scoria (Vesicular volcanic rock) — Igneous

Pumice or Scoria

Vesicular volcanic rock

Sandstone (Sandstone (Quartz-rich Arenite / SiO2)) — sedimentary

Sandstone

Sandstone (Quartz-rich Arenite / SiO2)

Blue-green cabochon, likely chalcedony or treated glass imitation (Cryptocrystalline quartz (chalcedony/possibly chrysoprase); identification uncertain from image) — gemstone

Blue-green cabochon, likely chalcedony or treated glass imitation

Cryptocrystalline quartz (chalcedony/possibly chrysoprase); identification uncertain from image

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Diamond (in a gold ring) (Diamond (pure carbon, C)) — mineral

Diamond (in a gold ring)

Diamond (pure carbon, C)

Slag Glass (Silicon dioxide with impurities) — mineral

Slag Glass

Silicon dioxide with impurities

Coquina (Biogenic Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Coquina

Biogenic Limestone (Calcium Carbonate, CaCO3)

Brick fragment (Man-made material) (N/A (Fired clay)) — man-made

Brick fragment (Man-made material)

N/A (Fired clay)

Petrified Wood (Silicified wood (Quartz/Chalcedony replacement of organic matter)) — sedimentary

Petrified Wood

Silicified wood (Quartz/Chalcedony replacement of organic matter)

Chrysocolla-bearing rock (likely chrysocolla in quartz/limonite matrix) (Chrysocolla, hydrated copper aluminosilicate: (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O) — mineral

Chrysocolla-bearing rock (likely chrysocolla in quartz/limonite matrix)

Chrysocolla, hydrated copper aluminosilicate: (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O

Tumbled tan stone, possibly sandstone or weathered limestone (Indeterminate; likely quartz-rich sandstone or calcitic limestone) — sedimentary

Tumbled tan stone, possibly sandstone or weathered limestone

Indeterminate; likely quartz-rich sandstone or calcitic limestone

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Polished serpentine-rich stone (Serpentinite, primarily serpentine-group minerals (antigorite, lizardite, or chrysotile)) — metamorphic

Polished serpentine-rich stone

Serpentinite, primarily serpentine-group minerals (antigorite, lizardite, or chrysotile)

Tumbled sodalite (Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂) — mineral

Tumbled sodalite

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Diorite (Polished Tumble) (Diorite (Intermediate intrusive igneous rock)) — Igneous

Diorite (Polished Tumble)

Diorite (Intermediate intrusive igneous rock)

Coquina (Biogenic Limestone (Calcite, CaCO3)) — sedimentary

Coquina

Biogenic Limestone (Calcite, CaCO3)

Quartz (Milky Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz Chip (Silicon Dioxide (SiO2)) — mineral

Milky Quartz Chip

Silicon Dioxide (SiO2)

Beaded blue-and-green gemstone jewelry (Likely dyed or treated chalcedony/agate and green aventurine or glass-like stone; exact identification requires testing) — gemstone

Beaded blue-and-green gemstone jewelry

Likely dyed or treated chalcedony/agate and green aventurine or glass-like stone; exact identification requires testing

Tumbled white quartz pebble (Quartz (silicon dioxide, SiO₂)) — mineral

Tumbled white quartz pebble

Quartz (silicon dioxide, SiO₂)

Pink quartz-like tumbled stone (possibly dyed quartz or pink chalcedony) (Quartz, SiO₂; appearance may also fit dyed quartzite or pink chalcedony) — mineral

Pink quartz-like tumbled stone (possibly dyed quartz or pink chalcedony)

Quartz, SiO₂; appearance may also fit dyed quartzite or pink chalcedony

Cubic Zirconia (or possibly Diamond) (Zirconium dioxide (or Carbon)) — gemstone

Cubic Zirconia (or possibly Diamond)

Zirconium dioxide (or Carbon)

Petrified Wood (Silicified Wood (Silicon Dioxide - SiO2)) — fossil

Petrified Wood

Silicified Wood (Silicon Dioxide - SiO2)

Green Jasper (Silicon Dioxide (SiO2)) — sedimentary

Green Jasper

Silicon Dioxide (SiO2)

Flint (Microcrystalline Quartz (SiO2)) — sedimentary

Flint

Microcrystalline Quartz (SiO2)

Brecciated jasper (likely ocean jasper or red jasper) (Microcrystalline quartz, SiO₂, with iron-oxide pigments and breccia cement) — mineral

Brecciated jasper (likely ocean jasper or red jasper)

Microcrystalline quartz, SiO₂, with iron-oxide pigments and breccia cement

Flint (Microcrystalline quartz (SiO2)) — sedimentary

Flint

Microcrystalline quartz (SiO2)

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

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Serpentinite with carbonate and iron-oxide alteration (Serpentinite; chiefly antigorite/lizardite Mg₃Si₂O₅(OH)₄, with magnetite, calcite, and chromian minerals) — metamorphic

Serpentinite with carbonate and iron-oxide alteration

Serpentinite; chiefly antigorite/lizardite Mg₃Si₂O₅(OH)₄, with magnetite, calcite, and chromian minerals