Goldstone
Avventurina (Man-made Glass with Copper inclusions)
mineral
Category
Anthropogenic (Man Made Material Mimicking Sedimentary Rock)
Browse anthropogenic (man made material mimicking sedimentary rock) specimens identified by the Rock Identifier community.
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Rock crystal (clear quartz), possibly cloudy quartz
Quartz, silicon dioxide (SiO₂)
mineral
Goldstone (Red)
Aventurine Glass (Cupriferous glass)
Synthetic Glass (Man-made)
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Green glass sphere/marble
Soda-lime glass (primarily SiO2, Na2O, CaO)
Man-made object (Simulant)
Sandstone
Sandstone (Quartz-rich Arenite / SiO2)
sedimentary
Sandstone
Arenite (specifically sublithic or quartz arenite)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Fossiliferous limestone with colonial coral
Calcite (CaCO₃) limestone containing fossil tabulate or rugose coral colonies
fossil
Asphalt aggregate (crushed stone in bitumen)
Artificial composite; predominantly crushed granite, basalt, limestone, and/or recycled aggregate bound by bitumen
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Opalite
Synthetic Opalite Glass
mineraloid (man-made)
Rock crystal quartz fragments
Quartz (silicon dioxide, SiO₂)
mineral
Carborundum (Silicon Carbide)
Silicon Carbide (SiC) / Moissanite (natural form)
mineral
Quartz crystal (likely clear quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Sandstone
Arenite (variable SiO2 composition)
sedimentary
Conglomeratic gravel / polymictic breccia
Polymictic rudite, likely anthropogenic or beach/stream gravel; composition varies
sedimentary
Limpets Shell / Fossil Specimen
Patellogastropoda (Class)
fossil
Tumbled milky quartz (likely)
Quartz, silicon dioxide (SiO₂)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Weathered iron-rich rock, possibly jasper or ironstone
Likely limonite/goethite-bearing siliceous rock; exact identification requires hardness and streak tests
mineral
Polished black stone, likely obsidian
Obsidian (volcanic glass; mostly silica-rich rhyolitic composition)
igneous
Goldstone (Brown/Gold)
Aventurine Glass (Man-made glass with Copper inclusions)
gemstone
Polished labradorite sphere
Labradorite, calcic plagioclase feldspar ((Ca,Na)(Al,Si)₄O₈)
mineral
Citrine Quartz
Citrine (Silicon Dioxide, SiO2)
mineral
Chert (specifically Tan/Gray Chert)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Diamond
Carbon (C)
gemstone
Sandstone
Clastic sedimentary rock (Quartz arenite/Arkose)
sedimentary
Chert (Flint / Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Sandstone (composed predominantly of Quartz, SiO2, with Feldspar and Clay minerals)
sedimentary
Blue chalcedony (likely dyed or treated)
Microcrystalline quartz, SiO₂ (chalcedony)
gemstone
Pyrite in Quartz (Drill Core)
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions
igneous/metamorphic (hydrothermal)
Green glassy mineral fragment, possibly fluorite
Fluorite (calcium fluoride, CaF₂), tentative identification
mineral
Iron Slag
Ferrous slag (primarily silicates and oxides of calcium, iron, and magnesium)
Anthropogenic (Man-made industrial byproduct)
Weathered chert or chalcedony nodule
Microcrystalline quartz (SiO₂), possibly silicified limestone or agate-like chalcedony
sedimentary
Chert (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Clear quartz sphere
Quartz (silicon dioxide, SiO₂)
mineral
Chert (Arrowhead/Projectile Point)
Microcrystalline quartz (SiO2)
sedimentary
Tumbled milky quartz pebble
Quartz (silicon dioxide, SiO₂), likely milky quartz
mineral
Carborundum (Silicon Carbide)
Silicon carbide (SiC)
mineral