Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (SiO2 primary composition)
sedimentary
Category
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Sandstone (Nut-stone / Cup-stone artifact)
Quartz Arenite / Worked Sedimentary Rock
sedimentary
Hag Stone
Perforated Sedimentary Rock (Typically Limestone or Sandstone)
sedimentary
Basalt Pebble with Quartz Inclusion
Basalt (SiO2 with Fe, Mg silicates) with Quartz (SiO2)
igneous
Amber (Simulated/Faturan Style)
Resin mix (Likely Phenolic/Celluloid if synthetic, Succinite if natural)
Organic Gemstone (not a mineral)
Pink Granite
Phaneritic intrusive felsic igneous rock
igneous
Vesicular basalt (likely weathered lava rock)
Basalt; fine-grained mafic volcanic rock composed chiefly of plagioclase, pyroxene, and commonly olivine
igneous
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Rounded gray river pebble, likely basalt or andesite
Fine-grained mafic volcanic rock; commonly basalt (plagioclase, pyroxene, ± olivine)
igneous
Native American Hammerstone / Pitted Stone
Modified lithic artifact (often quartzite, basalt, or granite)
artifact / sedimentary or igneous rock
Sandstone Pebble (River Rock)
Sandstone (Quartz-rich sedimentary rock with iron oxide staining)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
River Quartzite or Chert Pebble
Quartzite (primarily Silicon Dioxide - SiO2)
metamorphic
Sandstone (with Iron Staining)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Banded Agate (Botswana Agate)
Silicon Dioxide (SiO2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2 with Iron impurities)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Red Jasper (with Quartz and Chert)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Red Jasper (Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Bull Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Greywacke Siltstone Pebble / Concretionary River Pebble
Siltstone / Argillite (Fine-grained Sedimentary Rock)
sedimentary
Asphalt (Road Aggregate)
Bituminous conglomerate
sedimentary
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Shale with Limonite/Hematite Staining
Argillaceous sedimentary rock with Iron Oxides (FeO(OH)·nH2O / Fe2O3)
sedimentary
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Red Sandstone
Arenite (with Iron Oxide)
sedimentary
Amethyst (Tumbled)
Silicon Dioxide (SiO2) with iron impurities
mineral
Precious Red Coral
Corallium rubrum / Corallium japonicum
mineral (organic gemstone)
Sandstone
Clastic sedimentary rock (primarily quartz arenite)
sedimentary
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium) CuAl6(PO4)4(OH)8·4H2O
mineral
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
N/A - Image does not contain a rock or mineral
Anthropogenic textile material
Non-geological
Iron-rich weathered rock, likely limonite/goethite-bearing laterite
Limonite (variable hydrated iron oxides; chiefly goethite, α-FeO(OH))
mineral
Shale (or Slate / Coal / Jet)
Laminated fine-grained sedimentary rock (predominantly clay minerals)
sedimentary
Polished agate/chalcedony fragment
Microcrystalline quartz (SiO₂), likely banded chalcedony or agate
gemstone
Black Onyx
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Chert (Jasper/Carnelian variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2) with Hematite/Limonite
mineral