Shale with Vein Infillings
Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.
Sedimentary Rock
Category
Not A Natural Rock
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Sandstone
Arenite (SiO2 primarily)
sedimentary
Agate with Fossil/Inclusion
Silicon Dioxide (SiO2) with chalcedony and potential fossil inclusion
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Shale / Mudstone
Sedimentary rock (Claystone / Mudstone / Shale)
sedimentary
Sandstone
Arenite
sedimentary
Hag Stone
Perforated Flint or Chert (SiO2)
sedimentary
Porphyritic Basalt or Porphyritic Andesite Pebble
Extrusive Igneous Rock
igneous
Heat-Treated Amethyst (Citrine Geode)
Silicon Dioxide (SiO2) with iron impurities
mineral
Hag Stone
Naturally holed stone (typically sedimentary rock such as flint, limestone, or sandstone)
Sedimentary
Chert (Green Fossilized Algae or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Rhinestone (or glass crystal)
Silicon dioxide (if glass) / Various
Mineral/gemstone imitation
Basalt River Stone
Basalt (extrusive igneous rock)
igneous
Yellow Quartz Pebble (Citrine or Iron-Stained Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Ferruginous)
Sandstone (SiO2 with iron oxides)
sedimentary
Sandstone
Sandstone (composed predominantly of Quartz, SiO2)
sedimentary
Goldstone (blue-goldstone–style glass) beads
Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral
mineral
Obsidian
Volcanic Glass (Amorphous silicon dioxide with impurities)
igneous
Coquina or Fossiliferous Conglomerate
Bioclastic Rudstone (variable composition)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Conglomerate
Conglomerate (Detrital Sedimentary Rock)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Asphalt (Bituminous Slate/Sandstone)
Asphaltum / Bituminous Rock
sedimentary
Sandstone
Arenite
sedimentary
Granite Pebble (Pink Feldspar-rich)
Granite
igneous
Decorative polished pebbles
Likely mixed quartz-rich lithologies, including quartzite, jasper, and/or basalt
mineral
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Banded Sandstone (Beach Pebble)
Quartz Arenite Sandstone
sedimentary
Amethyst
Silicon Dioxide (SiO2)
mineral
Shale
Sedimentary pelitic rock
sedimentary
Polished Black Basalt Pebble
Basalt
igneous
Sandstone (with Iron Staining)
Clastic sedimentary rock (SiO2 with Fe2O3 oxides)
sedimentary
Sandstone Pebble
Sedimentary Rock (Quartz Arenite)
sedimentary
Basalt (Greenstone/Water-worn Pebble)
Basalt (containing Chlorite/Epidote)
igneous
Sandstone
Arenite (SiO2 principal component)
sedimentary
Sandstone
Arenite (SiO2 with minor iron oxides)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Arenite (SiO2 dominant)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (SiO2 based)
sedimentary