Clear faceted gemstone in a gold-colored setting
Likely colorless quartz (rock crystal) or synthetic cubic zirconia; visual identification is inconclusive
gemstone
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
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Iron Slag
Anthropogenic Iron oxide/Silicate composite
Mineral-like byproduct (Technogenic)
Rose Quartz
Silicon Dioxide (SiO2) with trace titanium, iron, or manganese
mineral
Iron Meteorite
Siderite (Iron-Nickel Alloy)
mineral
Asphalt (Bituminous Pavement Bit)
Bitumen-bound aggregate (Petrochemical-bound composite)
sedimentary (anthropogenic/technogenic)
Bismuth Crystal
Bismuth (Bi)
mineral
Chert (Arrowhead Fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Painted River Pebble (likely Basalt or Greywacke)
Aphanitic Lithic Clast with Anthropogenic Pigment coating
Sedimentary or Igneous
Desert Rose
Baryte (BaSO4) or Gypsum (CaSO4·2H2O) with sand inclusions
mineral
Iron Meteorite
Siderite (Iron-Nickel Alloy)
mineral
Concrete
Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)
sedimentary (anthropogenic / man-made)
Unable to Identify (Image Obscured)
Indeterminate
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (Industrial byproduct)
mineraloid
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
mineral
Chert (Arrowhead Fragment)
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (SiO2 based typically)
sedimentary
Sandstone
Arenite (SiO2 based typically)
sedimentary
Quartz (Agate/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Diamond in Gold Setting
Diamond (C - pure carbon)
mineral
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
sedimentary
Amethyst (vibrant lilac/purple variety)
Silicon Dioxide (SiO2) with iron impurities
mineral
Sandstone
Arenite (SiO2 based with cement)
sedimentary
Possible tektite or iron-rich slag-like natural specimen
Uncertain; possibly natural glass (tektite) or magnetite-rich rock
mineral
Possible tektite or volcanic glass specimen
Natural silica glass; composition commonly near SiO₂, but exact identification requires chemical testing
mineral
Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)
Silicon Dioxide (SiO2) with metallic inclusions
man-made material
Bismuth
Bismuth (Bi)
mineral
Sandstone (Quartzose)
Arenite (SiO2 based typically)
sedimentary
Sandstone
Arenite (SiO2 based typically)
sedimentary
Aquamarine
Beryl (Be3Al2Si6O18 with Fe impurities)
mineral
Chert Arrowhead (Projectile Point)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Copper Ore
Mixed copper sulfides/oxides in gangue matrix
mineral
Red Sandstone
Arenite (SiO2 based with Fe2O3)
sedimentary
Sandstone
Arenite (SiO2 based typically)
sedimentary
Quartz / Common Opal Transition
Silicon Dioxide (SiO2)
mineral
Schist
Schist
metamorphic
Not a geological specimen
N/A (man-made object)
N/A
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Sandstone
Arenite (typically SiO2 based)
sedimentary
Moss Agate Geode Sphere
Silicon Dioxide (SiO2) - Chalcedony with Chlorite or Manganese inclusions
mineral
Chert (Arrowhead/Projectile Point)
Microcrystalline quartz (SiO2)
sedimentary
Gold Mineral
Native Gold (Au)
mineral
Iron Slag
Ferrous Slag (Silicate/Oxide mixture)
industrial byproduct (anthropogenic)