Bismuth Crystal
Bismuth (Bi)
mineral
Category
Man Made Byproduct (Non Geological)
Browse man made byproduct (non geological) specimens identified by the Rock Identifier community.
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Glass
Amorphous Silicon Dioxide (SiO2)
mineraloid
Man-made Crystal (Lead Glass)
Lead oxide-doped Silica Glass (approx. SiO2 + PbO)
Mineraloid/Synthetic Material
Chert Arrowhead (Projectile Point)
Microcrystalline Quartz (Chert or Flint)
sedimentary
Asphalt Concrete (Bituminous Conglomerate)
Anthropogenic Bituminous Conglomerate
sedimentary
Lava Rock with Fabric Impression
Scoria or Basalt with anthropogenic impressions
igneous
Goldstone (Brown/Gold variety)
Aventurine Glass (SiO2 with Copper inclusions)
Synthetic/Man-made glass (often mistaken for a mineral)
Ironstone Concretion (Pot Stone)
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Metal Chain (Likely Steel or a Steel Alloy)
Steel (primarily iron and carbon); specific alloy unknown
Man-made Object (Metal/Alloy)
Silver (Jewelry form)
Native Silver (Ag)
mineral
Titanium Aura Quartz
Silicon Dioxide (SiO2) coated with Titanium and Niobium
mineral
Blue Glass or Slag Glass
Amorphous Silica (Anthropogenic Glass)
mineral
Dzi Bead (Etched Chalcedony)
Cryptocrystalline Quartz (SiO2) with chemical etching
mineral
Concrete fragment with Aggregate
Anthropogenic Concrete with Calcarious and Siliceous Aggregate
sedimentary (anthropogenic/man-made)
Quartzite (Engineered Stone)
Silicon Dioxide (SiO2) based synthetic composite
metamorphic
Tumbled Clear Quartz/Rock Crystal
Silicon Dioxide (SiO2)
mineral
Cultured Marble (Synthetic)
Polymer-matrix composite (typically calcium carbonate in polyester resin)
Synthetic / Composite Material
Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)
Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)
Synthetic (Ceramic)
Man-made Synthetic Material (Plastic/Composite)
Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)
Non-geological / Synthetic
Asphalt Concrete
Bituminous Concrete (Anthropic Rock)
sedimentary
Concretion with Geode Cavity
Ferruginous Sandstone Concretion with Quartz Center
sedimentary
Goldstone
Avventurina (Man-made Glass with Copper inclusions)
mineral
Concrete / Anthropogenic Conglomerate
Man-made composite material (Portland cement, aggregate, and water)
not a natural rock
Blue Goldstone
Aventurine Glass
Man-made glass (often grouped with minerals in lapidary)
Asphalt (Aggregate)
Bituminous macadam / Concrete Aggregate
sedimentary
Sea Glass
Man-made vitreous material (silica-based glass)
mineral
Goldstone (Red/Brown)
Aventurine Glass (SiO2 with Copper inclusions)
Mineral (Man-made glass)
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
Tumbled milky quartz pebble
Quartz (silicon dioxide, SiO₂), opaque-to-translucent milky variety
mineral
Opalite
Synthetic Opalised Glass
mineraloid (synthetic)
Felsic Drill Core (likely Gneiss or Granite)
Felsic Metamorphic Rock (Gneissic profile)
metamorphic
Aura Quartz (Titanium/Rainbow Quartz)
SiO2 (Silicon Dioxide) with metallic coating
mineral
Blue Obsidian
Volcanic Glass (SiO2 with inclusions)
igneous
ABS Plastic (Acrylonitrile Butadiene Styrene)
(C8H8)x·(C4H6)y·(C3H3N)z
Synthetic Polymer (Synthetic Material)
Opalite
Man-made Glass (SiO2 + additives)
mineraloid (synthetic)
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Sandstone Concretion
Clastic Sedimentary Concretion (typically Quartz/Silica with Iron Oxide)
sedimentary
Opalite
Synthetic Opalite (Man-made glass)
mineral
Painted River Rock
Artificially Coated Sedimentary Rock
sedimentary
Diamond
Native Carbon (C)
gemstone