Basalt Pebble
Extrusive Igneous Rock
igneous
Category
Synthetic (Not A Natural Rock)
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Granite Pebble
Intrusive Igneous Rock
igneous
Sandstone (Ferruginous)
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Witch Stone (Hag Stone)
Perforated Sedimentary Rock (Typically Sandstone or Limestone)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Pumice and Scoria
Vesicular Volcanic Rock (Pumice: Silicic / Scoria: Mafic)
igneous
Slag (Industrial Byproduct)
Ferrous/Non-ferrous Silicate
igneous (artificial/anthropogenic)
Shale
Argillaceous sedimentary rock
sedimentary
Aggregate Concrete
Anthropogenic Conglomerate (Technosol)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Emerald in Matrix
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Blue Onyx (Dyed Agate/Chalky Chalcedony)
Silicon Dioxide (SiO2) with artificial pigment
mineral
Agate (Carnelian type)
Silicon Dioxide (SiO2)
mineral
Lapis Lazuli
Lapis lazuli (complex rock; primarily Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
River Pebble (Grey Quartzite / Sandstone Gravel)
Quartz-rich Sedimentary / Metamorphic River Pebble
sedimentary
Granite with Cupules / Bedrock Mortars
Granite (felsic intrusive plutonic rock)
igneous
Beach Agate / Jasper Pebble
Cryptocrystalline Quartz (SiO2)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Sandstone (composed mainly of Quartz, SiO2, and Feldspar)
sedimentary
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Ironstone Nodule
Ferruginous Sandstone / Limonite Concretion
sedimentary
Sandstone (likely Arkosic)
Arenite (SiO2 with KAlSi3O8)
sedimentary
Fossiliferous Limestone with Crinoid Stem
Sedimentary Rock with Echinodermata fossil fragment
fossil
Generic Rock / Pebble
Undetermined rock specimen
sedimentary
Sandstone
Arenite (primarily SiO2, silica)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Iron Slag
Anthropogenic Ferro-silicate
mineral
Pink Tumbled Agate
Silicon Dioxide (SiO2) with dye
mineral
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (Lithic arenite / Quartz arenite)
sedimentary
Liesegang Banded Sandstone (Concretion / Weathered Pebble)
Sandstone showing Liesegang rings / Weathering rind (SiO2 with iron oxides)
sedimentary
Hag Stone
Siltstone or Fine-grained Sandstone with boring (e.g., Lithophaga impact)
sedimentary
Sandstone Pebble
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Granite
Intrusive Igneous Rock
igneous
Granite Pebble (River Rock)
Granite
igneous
River Pebble (Siltstone / Fine-grained Sandstone)
Sedimentary Pebble (Siliclastic)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
gemstone