Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Category
Man Made Material, Not A Natural Rock Or Mineral Specimen
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Diamond
Carbon (C)
gemstone
Tumbled quartz-rich pebble
Microcrystalline quartz (SiO₂), possibly weathered chert or chalcedony
mineral
Sandstone (Ferruginous)
Arenite with Iron Oxide (Fe2O3) cement
sedimentary
Blue-green chrysocolla rough specimen
Chrysocolla, hydrated copper aluminosilicate; commonly associated with malachite, quartz, and limonite
mineral
Sandstone (Yellow/Tan)
Clastic sedimentary rock (primarily SiO2 with iron oxide staining)
sedimentary
Biotite-bearing granite or gneiss
Felsic granitoid; chiefly quartz, feldspar, and biotite mica
igneous
Chert (Black Flint)
Silicon Dioxide (SiO2)
sedimentary
Smoky Quartz with Feldspar
Silicon Dioxide (SiO2) with Potassium Feldspar (KAlSi3O8)
mineral
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Dark fine-grained rock, likely basalt
Basalt; chiefly plagioclase feldspar and pyroxene, commonly with olivine and iron oxides
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
White quartz pebble (likely milky quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Stainless Steel (Polished)
Ferrous Alloy containing Iron (Fe), Chromium (Cr), and Carbon (C)
Mineral equivalent / Metal Alloy
Tumbled yellow quartz (likely citrine or iron-stained quartz)
Quartz, SiO₂; yellow color from trace iron or irradiation/heat-related coloration
mineral
Blue Slag Glass
Anthropogenic Amorphous Silicon Dioxide
mineral
Diamond
Carbon (C)
mineral
Terrazzo (with Marble and Granite fragments)
Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates
sedimentary (man-made composite)
Rounded quartz-rich pebble
Quartz (SiO₂), possibly a quartzite or light-colored chert pebble
mineral
Yellow Sapphire (Raw)
Corundum (Al2O3)
mineral
Possible flint or slag fragment
Microcrystalline quartz (chalcedony), or iron-rich industrial slag
mineral
Man-made Ceramic / Clay Figurine
Aluminosilicate Ceramic (Processed Clay)
Synthetic (not a rock or mineral)
Fulgarite
Fulgurite (Lechatelierite / Vitrified Sand)
igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Porcelain Tile (Sandstone-look)
Man-made Ceramic (resembling Quartz-rich Sandstone)
sedimentary (imitation)
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Fossilized tooth, likely mammalian molar
Indeterminate Mammalia; mineralized dentine and enamel
fossil
Quartz crystal pendant
Quartz (silicon dioxide, SiO₂), likely rock crystal or milky quartz
mineral
Chrysocolla in Jasper (Chryso-Jasper)
Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O (Chrysocolla) + SiO2 (Jasper)
mineral
Blue Slag Glass
Amorphous Silica (Industrial byproduct)
Antropogenic (Man-made glass byproduct)
Crushed Stone / Gravel
Aggregatus saxum (variable mineral composition)
sedimentary
Bornite (“peacock ore”), likely weathered copper sulfide
Bornite, Cu₅FeS₄; possibly chalcopyrite, CuFeS₂, with iridescent tarnish
mineral
Banded Sedimentary Rock
Stratified Siliciclastic / Arenite or Siltstone with Mineral Bands
sedimentary
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Diamond
Carbon (C)
mineral
Diamond (in a gold setting)
Carbon (C)
mineral
Blue Glass or Slag Glass
Amorphous Silica (Anthropogenic Glass)
mineral
Pearl and Garnet Glass
Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass
mineral and glass
Granite or granitic rock fragment
Felsic intrusive igneous rock, typically quartz + feldspar + mica; exact species uncertain from the image
igneous
Sandstone
Sandstone (Quartz-rich Arenite / SiO2)
sedimentary
Diamond (or Cubic Zirconia simulant)
Carbon (C) - Diamond / Zirconium dioxide (ZrO2) - CZ
mineral
Granite Cobble
Phaneritic Felsic Igneous Rock
igneous