Terrazzo (Man-made Composite)
Cementitious or Resin-bound Lithic Composite
sedimentary (artificial)
Category
Not A Rock (Man Made Origin)
Browse not a rock (man made origin) specimens identified by the Rock Identifier community.
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Concrete rubble
Anthropogenic conglomerate
sedimentary
One Pound Coin (UK)
Nickel-Brass Alloy (Cu-Zn-Ni)
mineral
Asphalt Concrete
Bituminous Concrete (Anthropic Rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Tumbled Clear Quartz/Rock Crystal
Silicon Dioxide (SiO2)
mineral
Lava Rock with Fabric Impression
Scoria or Basalt with anthropogenic impressions
igneous
Concrete fragment with Aggregate
Anthropogenic Concrete with Calcarious and Siliceous Aggregate
sedimentary (anthropogenic/man-made)
Concrete / Anthropogenic Conglomerate
Man-made composite material (Portland cement, aggregate, and water)
not a natural rock
Slag
Anthropogenic Vitreous Silica/Iron oxides
mineral-like byproduct
Slag
Glassy silicate byproduct (anthropogenic material)
industrial byproduct
Seashell Fragment
Calcium carbonate (CaCO3) - primarily Aragonite or Calcite
fossil
Cullet Glass (Man-made Glass Slag)
Amorphous Silica (SiO2) with chemical additives
Mineraloid
Sandstone-based Concrete Fragment
Cementitious Composite with Sedimentary Aggregate
sedimentary (man-made/anthropogenic)
Dragon's Breath (Mexican Opal Glass)
Artisan Foil Glass (SiO2 based)
mineraloid
Opalite
Man-made Glass (Synthetic Opalized Glass)
mineral
Blue Goldstone
Man-made glass with cobalt and metal flecks
man-made glass
Painted River Rock
Artificially Coated Sedimentary Rock
sedimentary
Opalite
Synthetic glass / Opalized glass
gemstone
Diamond (or Simulant)
Carbon (C) or relevant simulant formula (e.g., ZrO2 for Cubic Zirconia)
gemstone
Dalmatian Stone
Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)
igneous
Concrete / Conglomerate (Man-made)
Artificial Conglomerate (Cementitious Composite)
sedimentary
Metal Chain Belt with Square Plates
Not applicable (man-made)
Man-made Object (Metalwork)
Asphalt (Road Aggregate)
Bituminous conglomerate
sedimentary
Felsic Drill Core (likely Gneiss or Granite)
Felsic Metamorphic Rock (Gneissic profile)
metamorphic
Opalite
Man-made Glass (SiO2 + additives)
mineraloid (synthetic)
Blue Slag Glass
Man-made Silicon Dioxide (Amorphous)
Anthropogenic (Man-made)
Sandstone Concretion
Clastic Sedimentary Concretion (SiO2 with Iron Oxide)
sedimentary
Diamond
Native Carbon (C)
gemstone
Concretion
Sedimentary Concretion (Ironstone / Calcite Concretion)
sedimentary
Sandstone Concretion
Sedimentary Clastic Rock (Silicate-rich)
sedimentary
Not a rock
Not a rock
Not a rock
Conglomerate
Conglomerate (Sedimentary rock containing rounded clasts)
sedimentary
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Asphalt / Road Aggregate
Bituminous Conglomerate (synthetic)
sedimentary
Not a rock
Not a rock
Not a rock
Not a rock
Not a rock
Not a rock
Tektite
Natural impact glass
meteorite
Rose Quartz and Cherry Quartz (Dyed Glass/Quartz)
Silicon Dioxide (SiO2) with inclusions/dye
gemstone
Concrete Fragment
Hardened Portland Cement Composite
Anthropogenic (Man-made material mimicking sedimentary rock)
Opalite
Synthetic glass / Opaque silicious glass
gemstone
Crescent Pebble
Weathered Quartzite or Sandstone Fragment
sedimentary