Rock Identifier

Category

Mineral Based Alloy (Anthropogenic)

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

Learn about Mineral Based Alloy (Anthropogenic) in the encyclopedia

Sard

White Obsidian

Glauconite

Hutcheonite

Halite

Sperrylite

Baddeleyite

Anatase

Brookite

Talc

Violet Obsidian

Lavender Obsidian

Bismuth Crystal (Bismuth (Bi)) — mineral

Bismuth Crystal

Bismuth (Bi)

Celestite (Celestine) (Strontium sulfate (SrSO4)) — mineral

Celestite (Celestine)

Strontium sulfate (SrSO4)

Iolite (Cordierite) (Cordierite (Magnesium Aluminum Silicate), Mg2Al4Si5O18) — Mineral

Iolite (Cordierite)

Cordierite (Magnesium Aluminum Silicate), Mg2Al4Si5O18

Sandstone (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone

Arenite (composed primarily of SiO2)

Iron-stained quartz-rich rock fragments (Likely quartz (SiO₂) with limonite/goethite iron oxides; possibly quartzite or silicified rock) — mineral

Iron-stained quartz-rich rock fragments

Likely quartz (SiO₂) with limonite/goethite iron oxides; possibly quartzite or silicified rock

Red Quartzite (Quartzite (primarily SiO2 with hematite impurities)) — metamorphic

Red Quartzite

Quartzite (primarily SiO2 with hematite impurities)

Chert (specifically Jasper/Carnelian Agate) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (specifically Jasper/Carnelian Agate)

Microcrystalline Quartz (SiO2)

Banded Agate (Sedimentary Cryptocrystalline Quartz (SiO2)) — mineral

Banded Agate

Sedimentary Cryptocrystalline Quartz (SiO2)

Stilbite (Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O)) — mineral

Stilbite

Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O)

Brachiopod or Bivalve Fossil in Limestone (Phylum Brachiopoda or Bivalvia (embedded in Calcium Carbonate matrix)) — fossil

Brachiopod or Bivalve Fossil in Limestone

Phylum Brachiopoda or Bivalvia (embedded in Calcium Carbonate matrix)

Lapis Lazuli (in jewelry setting) (Na8[Al6Si6O24]n(S,Cl,SO4,OH)2 (Lazurite-rich rock)) — metamorphic

Lapis Lazuli (in jewelry setting)

Na8[Al6Si6O24]n(S,Cl,SO4,OH)2 (Lazurite-rich rock)

Moqui Marble (Ironstone Concretion (Goethite/Hematite)) — sedimentary

Moqui Marble

Ironstone Concretion (Goethite/Hematite)

River Pebbles (Sandstone and Quartzite) (SiO2 (Quartz) dominated clastic rocks) — sedimentary and metamorphic

River Pebbles (Sandstone and Quartzite)

SiO2 (Quartz) dominated clastic rocks

sedimentary and metamorphic

Likely galena-bearing ore specimen (Galena (PbS), possibly with quartz or calcite gangue) — mineral

Likely galena-bearing ore specimen

Galena (PbS), possibly with quartz or calcite gangue

Aquamarine (Beryl (Be3Al2Si6O18)) — mineral

Aquamarine

Beryl (Be3Al2Si6O18)

Conglomerate (Polymictic Conglomerate) — sedimentary

Conglomerate

Polymictic Conglomerate

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Native bismuth (Bismuth (Bi), commonly artificially crystallized) — mineral

Native bismuth

Bismuth (Bi), commonly artificially crystallized

Honey calcite specimen (Calcite (calcium carbonate, CaCO₃)) — mineral

Honey calcite specimen

Calcite (calcium carbonate, CaCO₃)

Wallboard/Drywall (Gypsum-based) (Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O) — sedimentary

Wallboard/Drywall (Gypsum-based)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Silicified Gastropod Fossil (Agatized Fossil) (Gastropoda (Class) preserved in Chalcedony/Quartz (SiO2)) — sedimentary

Silicified Gastropod Fossil (Agatized Fossil)

Gastropoda (Class) preserved in Chalcedony/Quartz (SiO2)

Common Brown Pebble (Weathered Rock Fragment) — sedimentary

Common Brown Pebble

Weathered Rock Fragment

Fossilized Rugose Coral (Order Rugosa) — fossil

Fossilized Rugose Coral

Order Rugosa

Gravel or Pebble (Clastic Sedimentary Grain (typically composed of Quartz or Silicate minerals)) — sedimentary

Gravel or Pebble

Clastic Sedimentary Grain (typically composed of Quartz or Silicate minerals)

Conglomerate (Polymictic Conglomerate) — sedimentary

Conglomerate

Polymictic Conglomerate

Native bismuth (Bismuth (Bi), commonly with a naturally oxidized surface) — mineral

Native bismuth

Bismuth (Bi), commonly with a naturally oxidized surface

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)

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Sunstone (Plagioclase Feldspar (Na,Ca)(Al,Si)4O8) — Mineral

Sunstone

Plagioclase Feldspar (Na,Ca)(Al,Si)4O8

Silver (Native Element) (Ag (Argentum) - 90% Silver, 10% Copper alloy in specimen) — mineral

Silver (Native Element)

Ag (Argentum) - 90% Silver, 10% Copper alloy in specimen

Green Aventurine (Quartzite with Fuchsite (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)) — metamorphic

Green Aventurine

Quartzite with Fuchsite (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Quartz (Engineered Stone Countertop) (Silicon Dioxide (SiO2) with polymer resins) — Sedimentary-like (Industrial Composite)

Quartz (Engineered Stone Countertop)

Silicon Dioxide (SiO2) with polymer resins

Sedimentary-like (Industrial Composite)

Slickenside (Tectonic Fault Scarp Surface) — metamorphic

Slickenside

Tectonic Fault Scarp Surface

Yellow Jasper (Chalcedony (SiO2) with iron oxide inclusions) — mineral

Yellow Jasper

Chalcedony (SiO2) with iron oxide inclusions

Slate (Foliated Metamorphic Rock (primarily composed of quartz, illite, chlorite, and micas)) — metamorphic

Slate

Foliated Metamorphic Rock (primarily composed of quartz, illite, chlorite, and micas)

Granite (Felsic Intrusive Igneous Rock) — igneous

Granite

Felsic Intrusive Igneous Rock

Granite Pegmatite (Coarse-grained Granite (SiO2 - Aluminum and Alkalies)) — igneous

Granite Pegmatite

Coarse-grained Granite (SiO2 - Aluminum and Alkalies)

Travertine (Terrestrial Sedimentary Rock (CaCO3)) — sedimentary

Travertine

Terrestrial Sedimentary Rock (CaCO3)

Red gemstone ring, likely garnet or synthetic ruby (Possibly almandine garnet (Fe₃Al₂(SiO₄)₃) or corundum/ruby (Al₂O₃); image alone cannot distinguish) — gemstone

Red gemstone ring, likely garnet or synthetic ruby

Possibly almandine garnet (Fe₃Al₂(SiO₄)₃) or corundum/ruby (Al₂O₃); image alone cannot distinguish

Galena-rich sulfide specimen (Galena (lead sulfide, PbS), possibly with sphalerite and oxidized sulfides) — mineral

Galena-rich sulfide specimen

Galena (lead sulfide, PbS), possibly with sphalerite and oxidized sulfides

Emerald / Fluorite (Beryl (Be3Al2Si6O18) / Fluorite (CaF2)) — mineral

Emerald / Fluorite

Beryl (Be3Al2Si6O18) / Fluorite (CaF2)

Porphyritic Basalt (Chinese Writing Stone) (Porphyritic Basalt or Andesite containing plagioclase feldspar phenocrysts) — igneous

Porphyritic Basalt (Chinese Writing Stone)

Porphyritic Basalt or Andesite containing plagioclase feldspar phenocrysts