Rock Identifier

Category

Mineral Like (Anthropogenic)

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

Learn about Mineral Like (Anthropogenic) in the encyclopedia

Calc-Silicate Rock

Calc-Silicate Rock

Garden Quartz

Ribbon Jasper

Sagenite Agate

Leopard Skin Jasper

Leopard Skin Jasper

Flower Jasper

Feather Jasper

Dendritic Opal

Starburst Agate

Plume Agate

Feather Agate

Moss Opal

Potash (Sylvite/Potassium Feldspar) (Potassium chloride (KCl) or Orthoclase (KAlSi3O8)) — mineral

Potash (Sylvite/Potassium Feldspar)

Potassium chloride (KCl) or Orthoclase (KAlSi3O8)

Schist (Mica Schist) — metamorphic

Schist

Mica Schist

Picture Jasper (Silicon Dioxide (SiO2) with iron oxide and silicate minerals) — sedimentary

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide and silicate minerals

Mica Schist (Schist (primarily Muscovite and Biotite mica)) — metamorphic

Mica Schist

Schist (primarily Muscovite and Biotite mica)

Yellow Jasper (Silicon Dioxide (SiO2) with goethite or iron oxide inclusions) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with goethite or iron oxide inclusions

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Geode (unopened nodule) (Silicon Dioxide (SiO2) Nodule) — sedimentary

Geode (unopened nodule)

Silicon Dioxide (SiO2) Nodule

Nickel coin (U.S. currency) (Cupronickel (75% Copper, 25% Nickel alloy)) — man-made alloy (metallic)

Nickel coin (U.S. currency)

Cupronickel (75% Copper, 25% Nickel alloy)

man-made alloy (metallic)

Yellow Ochre / Limonite (Limonite (FeO(OH)·nH2O)) — Mineral

Yellow Ochre / Limonite

Limonite (FeO(OH)·nH2O)

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Limonite (Iron Ore) (Limonite (mixed iron hydroxides, primarily FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore)

Limonite (mixed iron hydroxides, primarily FeO(OH)·nH2O)

Chrysocolla on Matrix (Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4·nH2O) — mineral

Chrysocolla on Matrix

Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4·nH2O

Azurite-Malachite with Limonite (Cu3(CO3)2(OH)2 (Azurite) / Cu2CO3(OH)2 (Malachite)) — mineral

Azurite-Malachite with Limonite

Cu3(CO3)2(OH)2 (Azurite) / Cu2CO3(OH)2 (Malachite)

Pegmatite or Graphic Granite (Intrusive Igneous Rock) — igneous

Pegmatite or Graphic Granite

Intrusive Igneous Rock

Limonite (FeO(OH)·nH2O) — mineral

Limonite

FeO(OH)·nH2O

Sandstone (Arenite (primarily SiO2 with trace Fe2O3)) — sedimentary

Sandstone

Arenite (primarily SiO2 with trace Fe2O3)

Fossil bivalve shell (Likely an internal mold or mineralized shell of a brachiopod or small bivalve; exact taxonomy requires locality and diagnostic details) — fossil

Fossil bivalve shell

Likely an internal mold or mineralized shell of a brachiopod or small bivalve; exact taxonomy requires locality and diagnostic details

Green Aventurine (Quartz (SiO2) with fuchsite inclusions) — mineral

Green Aventurine

Quartz (SiO2) with fuchsite inclusions

Snowflake Obsidian (Volcanic glass with Phenocrysts (SiO2)) — igneous

Snowflake Obsidian

Volcanic glass with Phenocrysts (SiO2)

Sandstone or Quartzite (Arenite (if sedimentary) / Quartzite (if metamorphic)) — Sedimentary or Metamorphic

Sandstone or Quartzite

Arenite (if sedimentary) / Quartzite (if metamorphic)

Sedimentary or Metamorphic

Obsidian (Volcanic Glass (Amorphous Silica, SiO2)) — igneous

Obsidian

Volcanic Glass (Amorphous Silica, SiO2)

Quartz with impurities or Host Rock (SiO2 (Silicon Dioxide) with mixed silicates) — mineral

Quartz with impurities or Host Rock

SiO2 (Silicon Dioxide) with mixed silicates

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Yellow Quartz (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz

Silicon Dioxide (SiO2)

River Stone (likely Mudstone or Siltstone) (Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)) — sedimentary

River Stone (likely Mudstone or Siltstone)

Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)

Prehnite with Epidote (Prehnite (Ca2Al(AlSi3O10)(OH)2) with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))) — mineral

Prehnite with Epidote

Prehnite (Ca2Al(AlSi3O10)(OH)2) with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Silicon Carbide (Carborundum) (Moissanite (SiC), though mostly synthetic) — mineral

Silicon Carbide (Carborundum)

Moissanite (SiC), though mostly synthetic

Orthoclase Feldspar (Orthoclase (KAlSi₃O₈)) — mineral

Orthoclase Feldspar

Orthoclase (KAlSi₃O₈)

Granite Pebble (Granite (Plutonic Igneous Rock)) — igneous

Granite Pebble

Granite (Plutonic Igneous Rock)

Sandstone (Ferruginous) (Arenite (primarily SiO2 with Fe2O3 staining)) — sedimentary

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Fossilized Shark Tooth (Elasmobranchii gen. sp. indet. (Calcium Phosphate - Ca5(PO4)3(OH,F,Cl))) — fossil

Fossilized Shark Tooth

Elasmobranchii gen. sp. indet. (Calcium Phosphate - Ca5(PO4)3(OH,F,Cl))

Limonite with Gold-bearing Quartz (Hydrated Iron Oxide Hydroxide, FeO(OH)·nH2O) — mineral

Limonite with Gold-bearing Quartz

Hydrated Iron Oxide Hydroxide, FeO(OH)·nH2O

Schist (Greenschist / Mica Schist) (Metamorphic rock rich in platy minerals (e.g., Chlorite/Mica schist)) — metamorphic

Schist (Greenschist / Mica Schist)

Metamorphic rock rich in platy minerals (e.g., Chlorite/Mica schist)

Greenschist (Chlorite Schist (Greenschist Facies)) — metamorphic

Greenschist

Chlorite Schist (Greenschist Facies)

Blue Apatite (Fluoroapatite (Ca5(PO4)3F)) — mineral

Blue Apatite

Fluoroapatite (Ca5(PO4)3F)

Limonite (Iron-rich Siltstone / Sandstone base) (Hydrous ferric oxide mixture (FeO(OH)·nH2O)) — sedimentary

Limonite (Iron-rich Siltstone / Sandstone base)

Hydrous ferric oxide mixture (FeO(OH)·nH2O)

Bauxite (Bauxite (Al2O3·2H2O)) — sedimentary

Bauxite

Bauxite (Al2O3·2H2O)

Lepidolite (Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)) — mineral

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Granite (Felsic intrusive igneous rock) — igneous

Granite

Felsic intrusive igneous rock

Granite fragment (Granite) — igneous

Granite fragment

Granite

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Quartz Geode (Silicon Dioxide (SiO2) in Geode formation) — mineral

Quartz Geode

Silicon Dioxide (SiO2) in Geode formation