Concrete-like aggregate surface with embedded rock fragments
Anthropogenic concrete or exposed aggregate; not a natural rock specimen
sedimentary
Category
Industrial Byproduct (Anthropogenic Rock)
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Tiffany Stone
Bertrandite Fluorite (CaF2 + Be4Si2O7(OH)2)
metamorphic
Greenstone Celt (Polished Stone Axe)
Metamorphosed mafic rock (often Basalt or Diabase)
metamorphic
Asphalt (Road Aggregate)
Bituminous Conglomerate / Asphalt Concrete
Anthropogenic (Man-made)
Sea Glass
Man-made silicate glass
mineral
Quartz (Milky/River Quartz)
Silicon Dioxide (SiO2)
mineral
Sea Glass
Man-made silicate glass
mineral
Possible basaltic volcanic rock or iron-rich meteorite
Likely basalt (plagioclase–pyroxene rock); meteorite status cannot be confirmed visually
igneous
Chert / Flint Handaxe
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Arrowhead variety)
Chert (SiO2)
sedimentary
Slag Glass
SiO2 (Silicon Dioxide) with impurities
man-made glass
Concrete
Anthropogenic Sedimentary Conglomerate (Cement mixture: typically Ca2SiO4, Ca3SiO5, Ca3Al2O6)
sedimentary (artificial)
Sea Glass (Frosted Glass Fragment)
Amorphous Silica (Anthropogenic Sediment)
sedimentary
Chert (Arrowhead Preform or Point)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Sandstone-based Concrete Fragment
Cementitious Composite with Sedimentary Aggregate
sedimentary (man-made/anthropogenic)
Concrete Fragment
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Granite Pebble
Granite (Phaneritic intrusive igneous rock comprising Quartz, Feldspar, and Mica)
igneous
Ambergris
Ambra grisea (Metabolic byproduct)
Organic (Geological relative)
Chert (Arrowhead Fragment)
Silicon Dioxide (SiO2)
sedimentary
Tiffany Stone
Bertrandite-Bearing Fluorite Hyalite Opal
metamorphic
Green Obsidian Sphere (man-made glass)
Vitreous Silica with Chromium/Iron additives
mineralogical simulant
Fluorite
Calcium fluoride (CaF2)
mineral
Pyrite in Matrix
Iron Sulfide (FeS2)
mineral
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
sedimentary
Carborundum (Silicon Carbide)
Silicon Carbide (SiC)
mineral (synthetic)
Weathered metallic sulfide ore, likely pyrite-bearing rock
Pyrite (FeS₂), possibly in a quartz–iron-oxide host
mineral
Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)
Silicon Dioxide (SiO2) with metallic inclusions
man-made material
Conglomeratic gravel / polymictic breccia
Polymictic rudite, likely anthropogenic or beach/stream gravel; composition varies
sedimentary
Chert Arrowhead (Projectile Point)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Chert (Arrowhead/Projectile Point)
Microcrystalline quartz (SiO2)
sedimentary
Bismuth
Bismuth (Bi)
mineral
Silver (Native Element)
Ag (Argentum)
mineral
Fired Clay Brick (Anthropic Rock substitute)
Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)
metamorphic (man-made / anthropic)
Crackled Quartz (Blue Dyed)
Silicon Dioxide (SiO2) with anthropogenic dye
mineral
Slag
Ferrous slag (by-product of iron smelting)
Mineraloid / Anthropogenic
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Blue Dyed Quartzite
Silicon Dioxide (SiO2) with artificial pigment
metamorphic
Sea Glass
Man-made silicate glass weathering product
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert (Arrowhead/Projectile Point)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Arrowhead)
Chert (SiO2)
sedimentary
Pet Rock (Man-made Quartzite or Granite Cobble)
Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica
igneous or metamorphic (base stone); anthropogenic (decoration)