Asphalt Concrete
Bituminous Concrete (Anthropic Rock)
sedimentary
Category
Not A Rock (Man Made Polymer)
Browse not a rock (man made polymer) specimens identified by the Rock Identifier community.
Learn about Not A Rock (Man Made Polymer) in the encyclopedia
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Synthetic Convention Badge (Plastic/PVC)
Polyvinyl Chloride (PVC) / Polycarbonate
mineraloid (synthetic)
Cullet Glass / Slag Glass
Amorphous silica glass
man-made glass / industrial byproduct
One Pound Coin (UK)
Nickel-Brass Alloy (Cu-Zn-Ni)
mineral
Tumbled Clear Quartz/Rock Crystal
Silicon Dioxide (SiO2)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Concrete rubble
Anthropogenic conglomerate
sedimentary
Concrete / Anthropogenic Conglomerate
Man-made composite material (Portland cement, aggregate, and water)
not a natural rock
Concrete fragment with Aggregate
Anthropogenic Concrete with Calcarious and Siliceous Aggregate
sedimentary (anthropogenic/man-made)
Dzi Bead (Etched Chalcedony)
Cryptocrystalline Quartz (SiO2) with chemical etching
mineral
Slag
Anthropogenic Vitreous Silica/Iron oxides
mineral-like byproduct
Opalite
Man-made Glass (Synthetic Opalized Glass)
mineral
Cardstock (Paper)
Cellulose (C6H10O5)n
sedimentary (man-made)
Slag
Glassy silicate byproduct (anthropogenic material)
industrial byproduct
Dragon's Breath (Mexican Opal Glass)
Artisan Foil Glass (SiO2 based)
mineraloid
Concrete / Conglomerate (Man-made)
Artificial Conglomerate (Cementitious Composite)
sedimentary
Small rounded mineral pebble, possibly quartz
Uncertain; likely microcrystalline or crystalline SiO₂ (quartz), potentially with iron-oxide staining
mineral
Sandstone-based Concrete Fragment
Cementitious Composite with Sedimentary Aggregate
sedimentary (man-made/anthropogenic)
Lava Rock with Fabric Impression
Scoria or Basalt with anthropogenic impressions
igneous
Opalite
Synthetic glass / Opalized glass
gemstone
Diamond (or Simulant)
Carbon (C) or relevant simulant formula (e.g., ZrO2 for Cubic Zirconia)
gemstone
Painted River Rock
Artificially Coated Sedimentary Rock
sedimentary
Dalmatian Stone
Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)
igneous
Felsic Drill Core (likely Gneiss or Granite)
Felsic Metamorphic Rock (Gneissic profile)
metamorphic
Tumbled milky quartz
Quartz (SiO₂), cryptocrystalline-to-massive variety
mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Asphalt (Road Aggregate)
Bituminous conglomerate
sedimentary
Sandstone Concretion
Clastic Sedimentary Concretion (SiO2 with Iron Oxide)
sedimentary
Opalite
Synthetic glass (SiO2 + impurities)
mineral
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Diamond
Native Carbon (C)
gemstone
Concretion
Sedimentary Concretion (Ironstone / Calcite Concretion)
sedimentary
Sandstone Concretion
Sedimentary Clastic Rock (Silicate-rich)
sedimentary
Rose Quartz and Cherry Quartz (Dyed Glass/Quartz)
Silicon Dioxide (SiO2) with inclusions/dye
gemstone
Conglomerate
Conglomerate (Sedimentary rock containing rounded clasts)
sedimentary
Transit Token (RTD Denver)
Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)
not a rock or mineral (anthropogenic material)
Opalite
Synthetic glass / Opaque silicious glass
gemstone
Asphalt / Road Aggregate
Bituminous Conglomerate (synthetic)
sedimentary
Concrete Fragment
Hardened Portland Cement Composite
Anthropogenic (Man-made material mimicking sedimentary rock)
Crescent Pebble
Weathered Quartzite or Sandstone Fragment
sedimentary
Opalite
Man-made opalescent glass
gemstone
Opalite
Man-made opalized glass
mineral