Rock Identifier

Category

Organic (Anthropogenic)

Browse organic (anthropogenic) specimens identified by the Rock Identifier community.

Learn about Organic (Anthropogenic) in the encyclopedia

Sapropel

Bituminous Shale

Bituminous Shale

Black Shale

Petrified Wood

Amber

Jet

Peat

Oil Shale

Pearl

Lizard Skin Jasper

Opalized Wood

Coral Rock

Possible tektite or volcanic glass specimen (Natural silica glass; composition commonly near SiO₂, but exact identification requires chemical testing) — mineral

Possible tektite or volcanic glass specimen

Natural silica glass; composition commonly near SiO₂, but exact identification requires chemical testing

Chert (Arrowhead Debitage or Flake) (Microcrystalline silica (SiO2)) — sedimentary

Chert (Arrowhead Debitage or Flake)

Microcrystalline silica (SiO2)

Greenstone Celt (Polished Stone Axe) (Metamorphosed mafic rock (often Basalt or Diabase)) — metamorphic

Greenstone Celt (Polished Stone Axe)

Metamorphosed mafic rock (often Basalt or Diabase)

Slag (Anthropogenic Vitreous Silicate / Ferro-silicate Slag) — igneous

Slag

Anthropogenic Vitreous Silicate / Ferro-silicate Slag

Concrete (Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)) — sedimentary (anthropogenic / man-made)

Concrete

Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)

sedimentary (anthropogenic / man-made)

Painted River Pebble (likely Basalt or Greywacke) (Aphanitic Lithic Clast with Anthropogenic Pigment coating) — Sedimentary or Igneous

Painted River Pebble (likely Basalt or Greywacke)

Aphanitic Lithic Clast with Anthropogenic Pigment coating

Sedimentary or Igneous

Granite Pebble (Granite (Phaneritic intrusive igneous rock comprising Quartz, Feldspar, and Mica)) — igneous

Granite Pebble

Granite (Phaneritic intrusive igneous rock comprising Quartz, Feldspar, and Mica)

Slag (Industrial Glass) (Anthropogenic Vitreous Slag (Post-industrial byproduct)) — igneous

Slag (Industrial Glass)

Anthropogenic Vitreous Slag (Post-industrial byproduct)

Ferrochrome Slag (Anthropogenic slag (Fe-Cr alloy waste)) — industrial byproduct

Ferrochrome Slag

Anthropogenic slag (Fe-Cr alloy waste)

industrial byproduct

Cobalt Blue Slag Glass (Amorphous Silicon Dioxide (anthropogenic) with Cobalt additives) — mineraloid

Cobalt Blue Slag Glass

Amorphous Silicon Dioxide (anthropogenic) with Cobalt additives

Chert Arrowhead (Cryptocrystalline microcrystalline Quartz (SiO2)) — sedimentary

Chert Arrowhead

Cryptocrystalline microcrystalline Quartz (SiO2)

Quartzite Arrowhead (Archaeological Lithic) (Recrystallized Quartz (SiO2)) — metamorphic

Quartzite Arrowhead (Archaeological Lithic)

Recrystallized Quartz (SiO2)

Ferruginous Conglomerate (or Iron-Rich Concrete/Slag) (Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)) — sedimentary

Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)

Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)

Banded Slag Glass (Leland Blue/Frankfort Green style) (Anthropogenic Glass Specimen (Amorphous Silicon Dioxide with impurities)) — mineral

Banded Slag Glass (Leland Blue/Frankfort Green style)

Anthropogenic Glass Specimen (Amorphous Silicon Dioxide with impurities)

Eroded Brick or Pumice-like Scoria (Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)) — igneous

Eroded Brick or Pumice-like Scoria

Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)

Obsidian Arrowhead (Volcanic Glass (Primary composition: SiO2)) — igneous

Obsidian Arrowhead

Volcanic Glass (Primary composition: SiO2)

Ferruginous Slag (Iron Smelting Byproduct) (Anthropogenic Vitreous Silicate (often containing Fayalite: Fe2SiO4)) — Mineraloid/Anthropogenic (Technofossil)

Ferruginous Slag (Iron Smelting Byproduct)

Anthropogenic Vitreous Silicate (often containing Fayalite: Fe2SiO4)

Mineraloid/Anthropogenic (Technofossil)

Slag (Anthropogenic Glass/Iron byproduct) (Ferro-silicate Slag) — Anthropogenic (Man-made)

Slag (Anthropogenic Glass/Iron byproduct)

Ferro-silicate Slag

Anthropogenic (Man-made)

Grooved Maun Ball (Maul/Hammerstone-like Concretion) (Calcareous/Ferruginous Concretion in Sandstone Matrix) — sedimentary

Grooved Maun Ball (Maul/Hammerstone-like Concretion)

Calcareous/Ferruginous Concretion in Sandstone Matrix

Fired Clay Brick (Anthropic Rock substitute) (Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)) — metamorphic (man-made / anthropic)

Fired Clay Brick (Anthropic Rock substitute)

Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)

metamorphic (man-made / anthropic)

Slag (Industrial Glass) (Artificial Vitreous Silicate) — mineraloid (anthropogenic)

Slag (Industrial Glass)

Artificial Vitreous Silicate

mineraloid (anthropogenic)

Sea Glass (Amorphous Silica (SiO2) with various additives) — Mineraloid (Anthropogenic)

Sea Glass

Amorphous Silica (SiO2) with various additives

Mineraloid (Anthropogenic)

Slag (Ferrous slag (by-product of iron smelting)) — Mineraloid / Anthropogenic

Slag

Ferrous slag (by-product of iron smelting)

Mineraloid / Anthropogenic

Concrete Fragment (Hardened Portland cement and mineral aggregate) — sedimentary (anthropogenic)

Concrete Fragment

Hardened Portland cement and mineral aggregate

sedimentary (anthropogenic)

Cullet (Slag Glass) (Amorphous Silica (SiO2) with various metal oxide colorants) — mineraloid / anthropogenic

Cullet (Slag Glass)

Amorphous Silica (SiO2) with various metal oxide colorants

mineraloid / anthropogenic

Green Slag Glass (Amorphous Silicon Dioxide (with metallic impurities)) — Igneous (Anthropogenic)

Green Slag Glass

Amorphous Silicon Dioxide (with metallic impurities)

Igneous (Anthropogenic)

Slag (Industrial Glass Slag) (Amorphous Silica / Ferro-silicate Slag) — mineraloid / anthropogenic

Slag (Industrial Glass Slag)

Amorphous Silica / Ferro-silicate Slag

mineraloid / anthropogenic

Concrete (Anthropogenic Sedimentary Conglomerate (Cement mixture: typically Ca2SiO4, Ca3SiO5, Ca3Al2O6)) — sedimentary (artificial)

Concrete

Anthropogenic Sedimentary Conglomerate (Cement mixture: typically Ca2SiO4, Ca3SiO5, Ca3Al2O6)

sedimentary (artificial)

Amber (Copal) (Fossilized Tree Resin) — mineraloid

Amber (Copal)

Fossilized Tree Resin

Metal Chain (Likely Steel or a Steel Alloy) (Steel (primarily iron and carbon); specific alloy unknown) — Man-made Object (Metal/Alloy)

Metal Chain (Likely Steel or a Steel Alloy)

Steel (primarily iron and carbon); specific alloy unknown

Man-made Object (Metal/Alloy)

Raw Amber / Resin Mineral (Succinite (Fossilized Tree Resin)) — gemstone

Raw Amber / Resin Mineral

Succinite (Fossilized Tree Resin)

Amber (Succinite (formula varies, primarily C10H16O)) — Mineraloid (Organic)

Amber

Succinite (formula varies, primarily C10H16O)

Mineraloid (Organic)

Amber (Raw) (Succinite (Fossilized Resin)) — mineraloid

Amber (Raw)

Succinite (Fossilized Resin)

Pearls (likely freshwater cultured pearls) (Pearl: nacre, primarily aragonite (CaCO₃) with conchiolin) — gemstone

Pearls (likely freshwater cultured pearls)

Pearl: nacre, primarily aragonite (CaCO₃) with conchiolin

Amber and Citrine Quartz (Succinite (Amber) and Silicon Dioxide (SiO2 / Citrine)) — mineral

Amber and Citrine Quartz

Succinite (Amber) and Silicon Dioxide (SiO2 / Citrine)

Amber (Succinite (fossilized resin, C10H16O)) — mineral

Amber

Succinite (fossilized resin, C10H16O)

Amber (Succinicum (C10H16O)) — mineral

Amber

Succinicum (C10H16O)

Amber (Succinite (C10H16O)) — mineraloid

Amber

Succinite (C10H16O)

Amber (Succinite (specific to Baltic amber), fossilized tree resin) — Organic Mineraloid

Amber

Succinite (specific to Baltic amber), fossilized tree resin

Organic Mineraloid

Ceramic or Polished Stone Heart (Anthropogenic Material) (Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)) — Synthetic/Anthropogenic Mineraloid

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Synthetic/Anthropogenic Mineraloid

Naga Silver-Inlaid Ebony and Bone/Horn Beads (Diospyros (Ebony) or Keratin (Horn) with Silver/White-Metal Inlay) — Organic (Anthropological Artifact)

Naga Silver-Inlaid Ebony and Bone/Horn Beads

Diospyros (Ebony) or Keratin (Horn) with Silver/White-Metal Inlay

Organic (Anthropological Artifact)

Ironstone concretion / Limonitic Sandstone (Goethite/Hematite Cemented Sandstone (Hydrated Iron Oxide)) — sedimentary

Ironstone concretion / Limonitic Sandstone

Goethite/Hematite Cemented Sandstone (Hydrated Iron Oxide)