Tumbled Clear Quartz/Rock Crystal
Silicon Dioxide (SiO2)
mineral
Category
Not A Rock (Man Made Polymer)
Browse not a rock (man made polymer) specimens identified by the Rock Identifier community.
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Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Concrete fragment with Aggregate
Anthropogenic Concrete with Calcarious and Siliceous Aggregate
sedimentary (anthropogenic/man-made)
Lava Rock with Fabric Impression
Scoria or Basalt with anthropogenic impressions
igneous
Dzi Bead (Etched Chalcedony)
Cryptocrystalline Quartz (SiO2) with chemical etching
mineral
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
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
Painted River Rock
Artificially Coated Sedimentary Rock
sedimentary
Blue Goldstone
Man-made glass with cobalt and metal flecks
man-made glass
Dalmatian Stone
Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)
igneous
Concrete / Conglomerate (Man-made)
Artificial Conglomerate (Cementitious Composite)
sedimentary
Opalite
Synthetic glass / Opalized glass
gemstone
Diamond (or Simulant)
Carbon (C) or relevant simulant formula (e.g., ZrO2 for Cubic Zirconia)
gemstone
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)
Metal Chain Belt with Square Plates
Not applicable (man-made)
Man-made Object (Metalwork)
Not a rock
Not a rock
Not a rock
Sandstone Concretion
Clastic Sedimentary Concretion (SiO2 with Iron Oxide)
sedimentary
Diamond
Native Carbon (C)
gemstone
Blue Slag Glass
Man-made Silicon Dioxide (Amorphous)
Anthropogenic (Man-made)
Not a rock
Not a rock
Not a rock
Not a rock
Not a rock
Not a rock
Conglomerate
Conglomerate (Sedimentary rock containing rounded clasts)
sedimentary
Concretion
Sedimentary Concretion (Ironstone / Calcite Concretion)
sedimentary
Sandstone Concretion
Sedimentary Clastic Rock (Silicate-rich)
sedimentary
Asphalt / Road Aggregate
Bituminous Conglomerate (synthetic)
sedimentary
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Concrete Fragment
Hardened Portland Cement Composite
Anthropogenic (Man-made material mimicking sedimentary rock)
Rose Quartz and Cherry Quartz (Dyed Glass/Quartz)
Silicon Dioxide (SiO2) with inclusions/dye
gemstone
Terrazzo (Synthetic Composite Rock)
Cementitious or Epoxy Resin-bound Aggregates
Man-made metamorphic-style composite
Opalite
Synthetic glass / Opaque silicious glass
gemstone
Granite with Cupules / Bedrock Mortars
Granite (felsic intrusive plutonic rock)
igneous
Transit Token (RTD Denver)
Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)
not a rock or mineral (anthropogenic material)
Crescent Pebble
Weathered Quartzite or Sandstone Fragment
sedimentary
Asphalt Concrete (Bituminous Pavement)
Aggregates in Bitumen Matrix
Technogenic / Anthropogenic Pavement Material
Boxwork or Septarian Concretion
Septarian nodule / Boxwork weathering
sedimentary
Dyed Agate / Painted Stone
Silicon Dioxide (SiO2) with artificial pigment
sedimentary (base), then artificial