Rock Identifier

Category

Mineral (Processed Alloy)

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

Silicon (Element Si) — mineral

Silicon

Element Si

Unknown dark mineral fragment (Indeterminate; possibly a dark silicate mineral or slag-like geological fragment) — mineral

Unknown dark mineral fragment

Indeterminate; possibly a dark silicate mineral or slag-like geological fragment

Gypsum Wallboard (Drywall) (Hydrous calcium sulfate (CaSO4·2H2O)) — sedimentary (processed mineral product)

Gypsum Wallboard (Drywall)

Hydrous calcium sulfate (CaSO4·2H2O)

sedimentary (processed mineral product)

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

Native bismuth

Bismuth (Bi), commonly with a naturally oxidized surface

Small yellow mineral specimen (possibly sulfur) (Unidentified; appearance alone is insufficient to confirm sulfur) — mineral

Small yellow mineral specimen (possibly sulfur)

Unidentified; appearance alone is insufficient to confirm sulfur

Chalcopyrite (Copper iron sulfide (CuFeS2)) — mineral

Chalcopyrite

Copper iron sulfide (CuFeS2)

N/A - Man-made object (Jewelry Chain) (Antiqued or Oxidized Metal Chain (often Steel or Brass)) — Mineral (processed metal)

N/A - Man-made object (Jewelry Chain)

Antiqued or Oxidized Metal Chain (often Steel or Brass)

Mineral (processed metal)

Mixed Mineral Collection (with Titanium Aura Quartz) (Silicon Dioxide (SiO2) with metallic coatings and various silicates) — mineral

Mixed Mineral Collection (with Titanium Aura Quartz)

Silicon Dioxide (SiO2) with metallic coatings and various silicates

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

Wallboard/Drywall (Gypsum-based)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Rose Gold (Copper-Gold Alloy) (Aurum-Cuprum Alloy (Au-Cu)) — mineral (native element alloy)

Rose Gold (Copper-Gold Alloy)

Aurum-Cuprum Alloy (Au-Cu)

mineral (native element alloy)

Pale green translucent mineral fragment (Indeterminate; possibly fluorite, calcite, or glassy quartz) — mineral

Pale green translucent mineral fragment

Indeterminate; possibly fluorite, calcite, or glassy quartz

Jewelry Chain with Blue and Clear Gemstones (Likely Cubic Zirconia) (Cubic Zirconia (ZrO₂), Silver or White Gold/Platinum Alloy) — Mineral (synthetic) and Metal (precious/base)

Jewelry Chain with Blue and Clear Gemstones (Likely Cubic Zirconia)

Cubic Zirconia (ZrO₂), Silver or White Gold/Platinum Alloy

Mineral (synthetic) and Metal (precious/base)

Man-made Jewelry Charm (Enameled Metal) (Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.) — Synthetic / Manufactured Artifact

Man-made Jewelry Charm (Enameled Metal)

Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.

Synthetic / Manufactured Artifact

One Pound Coin (UK) (Nickel-Brass Alloy (Cu-Zn-Ni)) — mineral

One Pound Coin (UK)

Nickel-Brass Alloy (Cu-Zn-Ni)

Bismuth Crystal (Bismuth (Bi)) — mineral

Bismuth Crystal

Bismuth (Bi)

Dyed Agate (Silicon Dioxide (SiO2) - Chalcedony variety) — sedimentary

Dyed Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Bismuth Crystal (Bismuth (Bi)) — mineral

Bismuth Crystal

Bismuth (Bi)

Chrysocolla-bearing copper ore (Chrysocolla (hydrated copper aluminum silicate), likely with malachite/azurite and copper sulfides) — mineral

Chrysocolla-bearing copper ore

Chrysocolla (hydrated copper aluminum silicate), likely with malachite/azurite and copper sulfides

Opalite (Synthetic Glass / Man-made Opal Simulant) — gemstone

Opalite

Synthetic Glass / Man-made Opal Simulant

Milky Quartz with Chlorite / Mica inclusions (Silicon Dioxide (SiO2) with phyllosilicate inclusions) — igneous

Milky Quartz with Chlorite / Mica inclusions

Silicon Dioxide (SiO2) with phyllosilicate inclusions

Native Silver (Silver (Ag)) — mineral

Native Silver

Silver (Ag)

Unidentified gray metallic object (Not determinable from the image; likely a metal screw or manufactured fastener rather than geological material) — mineral

Unidentified gray metallic object

Not determinable from the image; likely a metal screw or manufactured fastener rather than geological material

Silver (Native Silver/Alloy Specimen) (Ag (Native Silver element), specifically a 90% Ag / 10% Cu alloy) — mineral

Silver (Native Silver/Alloy Specimen)

Ag (Native Silver element), specifically a 90% Ag / 10% Cu alloy

Aquamarine (Beryl (Be3Al2Si6O18 with Fe impurities)) — mineral

Aquamarine

Beryl (Be3Al2Si6O18 with Fe impurities)

Nickel (Nickel (Ni)) — mineral

Nickel

Nickel (Ni)

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Clear Quartz (Rock Crystal) Bead (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Rock Crystal) Bead

Silicon Dioxide (SiO2)

Green iridescent glass cabochon or synthetic gemstone (Likely synthetic glass; possibly coated synthetic quartz or lab-created green gemstone) — gemstone

Green iridescent glass cabochon or synthetic gemstone

Likely synthetic glass; possibly coated synthetic quartz or lab-created green gemstone

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

Gypsum (Wallboard/Drywall)

Calcium Sulfate Dihydrate (CaSO4·2H2O)

Rounded metallic-looking pebble, likely iron-rich rock or slag (Uncertain; possible limonite/goethite-rich ironstone, hematite-bearing material, or industrial slag) — mineral

Rounded metallic-looking pebble, likely iron-rich rock or slag

Uncertain; possible limonite/goethite-rich ironstone, hematite-bearing material, or industrial slag

Native Copper (Copper (Cu)) — mineral

Native Copper

Copper (Cu)

Road-surface aggregate (crushed stone) (Unidentifiable mixed lithic aggregate; likely basaltic/andesitic fragments with feldspar, quartz, and weathered rock) — igneous

Road-surface aggregate (crushed stone)

Unidentifiable mixed lithic aggregate; likely basaltic/andesitic fragments with feldspar, quartz, and weathered rock

Native gold-bearing sulfide specimen (Native gold (Au), likely intergrown with pyrite (FeS₂) or chalcopyrite (CuFeS₂)) — mineral

Native gold-bearing sulfide specimen

Native gold (Au), likely intergrown with pyrite (FeS₂) or chalcopyrite (CuFeS₂)

Dyed Blue Agate (Dragon Vein Agate) (Silicon Dioxide (SiO2) with artificial cobalt/organic dyes) — mineral

Dyed Blue Agate (Dragon Vein Agate)

Silicon Dioxide (SiO2) with artificial cobalt/organic dyes

Copper-rich rock, likely native copper-bearing material (Native copper (Cu), possibly mixed with cuprite/iron oxides in a copper-rich matrix) — mineral

Copper-rich rock, likely native copper-bearing material

Native copper (Cu), possibly mixed with cuprite/iron oxides in a copper-rich matrix

Blue Sapphire and Diamond (Set in Metal) (Corundum (Al2O3) and Diamond (C)) — mineral

Blue Sapphire and Diamond (Set in Metal)

Corundum (Al2O3) and Diamond (C)

Mixed Tumbled Gemstones (Agate, Aventurine, Pyrite, etc.) (Multiple (principally Silicon Dioxide SiO2 and Iron Disulfide FeS2)) — mineral

Mixed Tumbled Gemstones (Agate, Aventurine, Pyrite, etc.)

Multiple (principally Silicon Dioxide SiO2 and Iron Disulfide FeS2)

Quartz pebble in concrete (Quartz (SiO₂), embedded in Portland-cement concrete) — mineral

Quartz pebble in concrete

Quartz (SiO₂), embedded in Portland-cement concrete

Native gold (small nugget or grain) (Native gold, Au) — mineral

Native gold (small nugget or grain)

Native gold, Au

Black Obsidian (Extrusive Volcanic Glass (primarily SiO2)) — igneous

Black Obsidian

Extrusive Volcanic Glass (primarily SiO2)

Sulfide Ore (likely Galena and Sphalerite in Quartz) (Lead-Zinc Ore (PbS and ZnS)) — mineral

Sulfide Ore (likely Galena and Sphalerite in Quartz)

Lead-Zinc Ore (PbS and ZnS)