Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)
Silicon Dioxide (SiO2) with metallic inclusions
man-made material
Category
Anthropogenic (Man Made Material Mimicking Sedimentary Rock)
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Asphalt (Bituminous Pavement)
Bituminous mix (Aggregates with Bitumen binder)
sedimentary
Cullet Glass / Slag Glass
Amorphous silica glass
man-made glass / industrial byproduct
Blue opalescent glass-like gemstone (possibly imitation opalite)
Likely man-made opalite glass; composition varies, typically silica-based glass
gemstone
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (with concrete/human-made layer)
Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)
sedimentary
Industrial Slag
Anthropogenic Vitreous Slag
igneous
Asphalt (Road Aggregate)
Bituminous conglomerate
sedimentary
Asphalt Concrete
Bituminous Concrete / Asphaltic Composite
not a natural rock (man-made composite)
Terrazzo (Synthetic Composite Rock)
Cementitious or Epoxy Resin-bound Aggregates
Man-made metamorphic-style composite
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (SiO2) with metallic oxide impurities
mineraloid
Man-made Carved Stone (Scream Mask/Skull motif)
Carved Soapstone or Serpentine-rich rock
Anthropogenic (Man-made artifact)
Pearl and Garnet Glass
Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass
mineral and glass
Ferrochrome Slag
Anthropogenic slag (Fe-Cr alloy waste)
industrial byproduct
White pebble, likely quartz or calcite
Indeterminate from image; possible microcrystalline quartz (SiO₂) or calcite (CaCO₃)
mineral
Not a geological specimen
N/A (man-made object)
N/A
Conglomerate
Conglomerate (Sedimentary rock containing rounded clasts)
sedimentary
Sea Glass
Man-made vitreous material
gemstone
Sea Glass
Man-made vitreous material
mineral
Opalite
Man-made Glass (SiO2 + additives)
mineraloid (synthetic)
Synthetic Resin Charm (Seal Shape)
Polymer Resin with plastic glitter / Polyethylene terephthalate glitters
Synthetic material (Not a rock or mineral)
Sea Glass
Amorphous Silicon Dioxide (Man-made glass weathered by nature)
mineral
Asphalt Concrete
Bituminous Concrete
sedimentary (artificial)
Decorative mosaic cross containing mixed rock and glass fragments
Polychrome aggregate; likely quartz, feldspar, marble, granite, and assorted colored glass
mineral
Slag Glass
Vitreous Silicate Residue
industrial byproduct (anthropogenic rock)
Concrete with Aggregate
Composite construction material; primary matrix is Calcium Silicate Hydrate (C-S-H)
anthropogenic (human-made) sedimentary-like material
Obsidian
Volcanic Glass
igneous
Sea Glass
Man-made vitreous material (silica glass)
sedimentary
Small black stone fragment (possibly obsidian)
Unidentified dark rock; obsidian is volcanic glass (composition typically rhyolitic)
igneous
Rose Quartz and Cherry Quartz (Dyed Glass/Quartz)
Silicon Dioxide (SiO2) with inclusions/dye
gemstone
Opalite
Synthetic glass / Opalized glass
gemstone
Concrete fragment or Conglomerate
Artificial Conglomerate (Concrete) or Natural Conglomerate
sedimentary
Brick fragment (Man-made material)
N/A (Fired clay)
man-made
Likely tumbled red mineral or glass imitation
Indeterminate; possibilities include red jasper (microcrystalline quartz, SiO₂) or dyed chalcedony
mineral
Obsidian
Volcanic Glass
igneous
Clear quartz fragment (rock crystal)
Quartz, silicon dioxide (SiO₂)
mineral
ABS Plastic (Acrylonitrile Butadiene Styrene)
(C8H8)x·(C4H6)y·(C3H3N)z
Synthetic Polymer (Synthetic Material)
Opalite-style glass pendant
Man-made opalescent glass (not natural opal)
mineral
Diamond (or Simulant)
Carbon (C) or relevant simulant formula (e.g., ZrO2 for Cubic Zirconia)
gemstone
Asphalt Concrete (Bituminous Concrete)
Bituminous aggregate
sedimentary
Iron-rich slag or ironstone; appearance is not diagnostic
Likely iron-oxide-rich material (hematite, Fe₂O₃, and/or magnetite, Fe₃O₄); possibly smelting slag
mineral
Asphalt Chunk (Bituminous Concrete)
Aggregated Bitumen / Artificial Breccia
sedimentary