Possible tektite or iron-rich slag-like natural specimen
Uncertain; possibly natural glass (tektite) or magnetite-rich rock
mineral
Category
Mineral Based Alloy (Anthropogenic)
Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.
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Possible tektite or volcanic glass specimen
Natural silica glass; composition commonly near SiO₂, but exact identification requires chemical testing
mineral
Ceramic or Polished Stone Heart (Anthropogenic Material)
Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)
Synthetic/Anthropogenic Mineraloid
Standing Liberty Quarter (Silver Specimen)
Native Silver alloy (Ag with Cu traces)
mineral
Moss Agate Geode Sphere
Silicon Dioxide (SiO2) - Chalcedony with Chlorite or Manganese inclusions
mineral
Sea Glass (Frosted Glass Fragment)
Amorphous Silica (Anthropogenic Sediment)
sedimentary
Leland Blue Stone
Anthropogenic Iron Smelting Slag
mineraloid
Sulfide Ore (likely Galena and Sphalerite in Quartz)
Lead-Zinc Ore (PbS and ZnS)
mineral
Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)
Silicon Dioxide (SiO2) with metallic inclusions
man-made material
Pallasite Meteorite
Pallasite (ST-class)
mineral
Slag
Anthropogenic Vitreous Silica/Iron oxides
mineral-like byproduct
Iron Slag
Anthropogenic Vitreous Silicate (Byproduct of Smelting)
Mineral-like byproduct
Chert Arrowhead (Projectile Point)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Native Copper
Native Copper (Cu)
mineral
Not a geological specimen
N/A (man-made object)
N/A
Quartz / Common Opal Transition
Silicon Dioxide (SiO2)
mineral
Raw green beryl (likely aquamarine)
Beryl, Be₃Al₂Si₆O₁₈; blue-green variety is aquamarine
gemstone
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Chert (Arrowhead/Projectile Point)
Microcrystalline quartz (SiO2)
sedimentary
Milky Quartz
Silicon dioxide (SiO2)
mineral
Lava Rock with Fabric Impression
Scoria or Basalt with anthropogenic impressions
igneous
Iron Slag
Anthropogenic Vitreous Ferrous Silicate
industrial byproduct (anthropogenic)
Asphalt Chunk (with aggregate)
Bituminous concrete / Anthropogenic conglomerate
sedimentary (anthropogenic/man-made conglomerate)
Blue Sea Glass
Amorphous Silica (Anthropogenic glass)
not a rock (man-made origin)
Mixed Gemstone Collection
SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)
mineral
Iron Slag
Ferrous Slag (Silicate/Oxide mixture)
industrial byproduct (anthropogenic)
Slag
Anthropogenic Vitrophyre (Iron or Smelting Slag)
Mineral-like byproduct
Sandstone with Manganese Dendrites
Clastic Sedimentary Rock (SiO2 based with MnO2 inclusions)
sedimentary
Iron Slag
Anthropogenic Iron oxide/Silicate composite
Mineral-like byproduct (Technogenic)
Painted River Pebble (likely Basalt or Greywacke)
Aphanitic Lithic Clast with Anthropogenic Pigment coating
Sedimentary or Igneous
Rose Quartz
Silicon dioxide (SiO2) with traces of titanium, iron, or manganese
mineral
Blue slag glass / industrial smelter slag
Man-made iron-rich silicate slag; composition variable, commonly Fe–Ca–Mg–Al silicates with glassy phases
mineral
Silver (Morgan Dollar)
Native Silver (Ag) - 90% Silver, 10% Copper alloy
mineral
Slag (Industrial Glass)
Artificial Vitreous Silicate
mineraloid (anthropogenic)
Concrete
Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)
sedimentary (anthropogenic / man-made)
Sea Glass
Man-made silicate glass weathering product
sedimentary
Mineral Sand (Heavy Mineral Sand Concentrate)
Placer deposit concentrate containing minerals such as ilmenite, rutile, zircon, and magnetite
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Sandstone (Quartzose)
Arenite (SiO2 based typically)
sedimentary
Slag (Industrial Byproduct)
Ferrous/Non-ferrous Silicate
igneous (artificial/anthropogenic)
Slag
Ferrous Slag (Amorphous calcium-magnesium-aluminum silicates)
igneous (artificial/anthropogenic)
Sandstone
Arenite (SiO2 based typically)
sedimentary