Rock Identifier

Category

Mineral Based Alloy (Anthropogenic)

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

Silver (Native or Alloyed) (Ag (Argentum)) — mineral

Silver (Native or Alloyed)

Ag (Argentum)

Silver (Sterling Silver) (Argentum (Ag) mixed with Copper (Cu); Formula: Ag+Cu) — mineral

Silver (Sterling Silver)

Argentum (Ag) mixed with Copper (Cu); Formula: Ag+Cu

Iron Slag (Anthropogenic Vitreous Silicate (Byproduct of Smelting)) — Mineral-like byproduct

Iron Slag

Anthropogenic Vitreous Silicate (Byproduct of Smelting)

Mineral-like byproduct

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Orange Quartzite / Carnelian Agate (Silicon Dioxide (SiO2)) — metamorphic

Orange Quartzite / Carnelian Agate

Silicon Dioxide (SiO2)

Tree Agate (Silicon Dioxide (SiO2) with Dendritic Inclusions) — Mineral

Tree Agate

Silicon Dioxide (SiO2) with Dendritic Inclusions

Aquamarine (Pale variety) (Beryl (Be3Al2Si6O18)) — mineral

Aquamarine (Pale variety)

Beryl (Be3Al2Si6O18)

Bismuth (Bismuth (element Bi) with oxidized thin-film interference layer) — mineral

Bismuth

Bismuth (element Bi) with oxidized thin-film interference layer

Michigan Float Copper (Native Copper (Cu)) — mineral

Michigan Float Copper

Native Copper (Cu)

Red Moss Agate (Jasper) (Silicon Dioxide (SiO2) with Iron Oxide inclusions) — sedimentary

Red Moss Agate (Jasper)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Silicon (Silicon (Si)) — mineral

Silicon

Silicon (Si)

Sandstone (Arenite (SiO2 based with mineral cement)) — sedimentary

Sandstone

Arenite (SiO2 based with mineral cement)

Sandstone (Arenite (SiO2 based typically)) — sedimentary

Sandstone

Arenite (SiO2 based typically)

Chert (Arrowhead Fragment) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Arrowhead Fragment)

Microcrystalline Quartz (SiO2)

Green Aventurine (SiO2 (Silicon Dioxide with inclusions of Fuchsite)) — mineral

Green Aventurine

SiO2 (Silicon Dioxide with inclusions of Fuchsite)

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)

Aquamarine (Beryl (Be₃Al₂Si‑₆O₁₈)) — mineral

Aquamarine

Beryl (Be₃Al₂Si‑₆O₁₈)

Aquamarine (Beryl (Be₃Al₂Si₆O₁₈)) — mineral

Aquamarine

Beryl (Be₃Al₂Si₆O₁₈)

Arsenopyrite (Arsenopyrite (FeAsS)) — mineral

Arsenopyrite

Arsenopyrite (FeAsS)

Synthetic Faux Fur Fursuit (Polyacrylonitrile / Polyester (Synthetic Textile)) — not a rock (synthetic material/costume)

Synthetic Faux Fur Fursuit

Polyacrylonitrile / Polyester (Synthetic Textile)

not a rock (synthetic material/costume)

Banded Onyx (Mexican Onyx / Travertine) (Calcite (CaCO3) - Banded Travertine) — sedimentary

Banded Onyx (Mexican Onyx / Travertine)

Calcite (CaCO3) - Banded Travertine

Rose Quartz (Quartz (Silicon Dioxide - SiO2) with trace amounts of titanium, iron, or manganese) — mineral

Rose Quartz

Quartz (Silicon Dioxide - SiO2) with trace amounts of titanium, iron, or manganese

Blue Sapphire (in a faceted jewelry setting) (Corundum (Al2O3) with trace Iron and Titanium) — mineral

Blue Sapphire (in a faceted jewelry setting)

Corundum (Al2O3) with trace Iron and Titanium

Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Moss Agate (Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides) — mineral

Moss Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides

Fossil / Permineralized Bone (Tyrannosaurus rex fossil (Hydroxylapatite replaced by various minerals)) — sedimentary

Fossil / Permineralized Bone

Tyrannosaurus rex fossil (Hydroxylapatite replaced by various minerals)

Iron Slag (Anthropogenic Iron oxide/Silicate composite) — Mineral-like byproduct (Technogenic)

Iron Slag

Anthropogenic Iron oxide/Silicate composite

Mineral-like byproduct (Technogenic)

Gold (Aurum (Au)) — Mineral (Metal)

Gold

Aurum (Au)

Mineral (Metal)

Sandstone (likely Arkosic or Lithic Sandstone) (Arenite (SiO2 based with mineral inclusions)) — sedimentary

Sandstone (likely Arkosic or Lithic Sandstone)

Arenite (SiO2 based with mineral inclusions)

Sandstone (likely Arkosic or Quartzose) (Arenite (SiO2 based with mineral inclusions)) — sedimentary

Sandstone (likely Arkosic or Quartzose)

Arenite (SiO2 based with mineral inclusions)

Sandstone with Secondary Mineral Encrustation (Arenite with Silica/Calcite deposits (SiO2 or CaCO3)) — sedimentary

Sandstone with Secondary Mineral Encrustation

Arenite with Silica/Calcite deposits (SiO2 or CaCO3)

Moss Agate (Silicon Dioxide (SiO2) with inclusions) — mineral

Moss Agate

Silicon Dioxide (SiO2) with inclusions

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

Amazonite (Amazonite (KAlSi3O8)) — mineral

Amazonite

Amazonite (KAlSi3O8)

Black Spinel (Magnesium Aluminum Oxide (MgAl2O4)) — mineral

Black Spinel

Magnesium Aluminum Oxide (MgAl2O4)

Terracotta (Man-made ceramic brick fragment) (Baked clay / High-iron ceramic (Silicate-based ceramic)) — Anthropogenic material (Man-made sedimentary mimic)

Terracotta (Man-made ceramic brick fragment)

Baked clay / High-iron ceramic (Silicate-based ceramic)

Anthropogenic material (Man-made sedimentary mimic)

Blue Quartzite (Quartzite (silicon dioxide, SiO2)) — metamorphic

Blue Quartzite

Quartzite (silicon dioxide, SiO2)

Blue Sapphire (Corundum (Al2O3)) — mineral

Blue Sapphire

Corundum (Al2O3)

Gold (Gold (Native Element); Au) — mineral

Gold

Gold (Native Element); Au

Native Copper (Native Copper (Cu)) — mineral

Native Copper

Native Copper (Cu)

Asphalt Chunk (with aggregate) (Bituminous concrete / Anthropogenic conglomerate) — sedimentary (anthropogenic/man-made conglomerate)

Asphalt Chunk (with aggregate)

Bituminous concrete / Anthropogenic conglomerate

sedimentary (anthropogenic/man-made conglomerate)

Banded Calcite (often sold as 'Green Onyx') (Calcite (Calcium Carbonate, CaCO3)) — sedimentary

Banded Calcite (often sold as 'Green Onyx')

Calcite (Calcium Carbonate, CaCO3)