Basalt (Worn Cobble / Artifact)
Aphanitic Extrusive Igneous Rock
igneous
Category
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Sandstone
Arenite (SiO2 primarily)
sedimentary
Quartz Veined Quartzite or Sandstone
Quartzite with Quartz Veins (SiO2)
sedimentary
Porphyritic Basalt or Porphyritic Andesite Pebble
Extrusive Igneous Rock
igneous
Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary
Red Sandstone (Iron-rich)
Arenite (with Hematite cement)
sedimentary
Hag Stone
Perforated Quartz / Sedimentary Rock
sedimentary
Granite
Granite (Phaneritic Quartz-Feldspar rock)
igneous
Pink Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Sandstone pebble
Sandstone (Quartz-rich Arenite)
sedimentary
Amethyst (Purple Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz with Hematite inclusions
Silicon Dioxide (SiO2) with Fe2O3 inclusions
mineral
Basalt
Mafic Igneous Rock
igneous
Sandstone (Quartzite-rich Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Quartzite-rich Pebble)
Arenite (primarily SiO2)
sedimentary
Small tumbled dark stone, possibly basalt or slag
Likely fine-grained basalt; exact identification is uncertain from the photograph
igneous
Amethyst Elestial Quartz
Silicon Dioxide with inclusions (SiO2)
mineral
Tumbled Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Dyed Blue Agate Slice
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Iron Slag
Anthropogenic Vitreous Silicate (Byproduct of Smelting)
Mineral-like byproduct
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz Geode (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Stream-Rounded Shale or Mudstone
Argillaceous sedimentary rock
sedimentary
Banded Sandstone / Quartzite Pebble
Sedimentary quartz arenite with liesegang banding
sedimentary
Asphalt (Bituminous Slate/Sandstone)
Asphaltum / Bituminous Rock
sedimentary
Chalcedony (Jasper/Agate mix)
Quartz (microcrystalline SiO2)
sedimentary
River Pebble (Siltstone / Basalt)
Microcrystalline Quartz / Indurated Mudstone / Fine-grained Basalt
sedimentary
Chert (Grey-Green Flint)
Microcrystalline silicon dioxide (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Vesicular volcanic rock, likely weathered pumice or scoria
Pumice/scoria; predominantly volcanic glass and feldspar, with possible iron oxides
igneous
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Granite
Phaneritic plutonic rock (Silica-rich)
igneous
Pink Granite
Phaneritic Felsic Igneous Plutonic Rock
igneous
Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Granite
Granite (Felsic intrusive igneous rock)
igneous
Dyed or treated turquoise-like tumbled stone
Likely turquoise (CuAl₆(PO₄)₄(OH)₈·4H₂O), though blue-green magnesite or howlite imitation is possible
mineral
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary