Sandstone
Arenite/Quartz Arenite
sedimentary
Category
Not A Natural Rock
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Chalcedony (Agate / Quartz Beach Pebble)
Silicon Dioxide (SiO2)
mineral
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Sandstone
Sandstone (Quartzose/Feldspathic Sandstone)
sedimentary
Banded Ironstone / Jasper Siltstone
Siltstone with Iron Oxide Hydrates (SiO2 with Fe2O3/FeO(OH))
sedimentary
Sandstone
Sedimentary quartz arenite
sedimentary
Granite Cobble / Gneiss (River Rock)
Granitic Gneiss / Felsic Igneous Rock
igneous
Green Quartz (Prasiolite/Adventurine)
Silicon Dioxide with inclusions (SiO2)
mineral
Sandstone (Quartzose Sandstone)
Arenite (SiO2 principal component)
sedimentary
Conglomerate
Conglomerate (Clastic Sedimentary Rock)
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Sandstone (specifically Banded Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
River Stone (Sandstone with Oxide Banding)
Arenite with Iron/Manganese Oxide inclusions
sedimentary
Carnelian and Strawberry Quartz
Silicon Dioxide (SiO2) with Hematite and Limonite inclusions
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Blue Agate Geode Slice
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Blue Obsidian (Cullet Glass)
Silicon Dioxide (Amorphous Glass)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Polished Tumbled Stone (Dark Chalcedony / Jasper)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Smoky Quartz with Chert
Silicon Dioxide (SiO2)
mineral
Pumice
Vesicular Rhyolite or Trachyte (High-silica volcanic glass)
igneous
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Sandstone (clastic sedimentary rock composite)
sedimentary
Dyed Dalmatian Stone
Aplite (Alkali-feldspar granite) with Arfvedsonite
igneous
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Granite
Granite (interlocking crystals of quartz, feldspar, and mica)
igneous
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (SiO2 based typically)
sedimentary
Quartz Druzy on Agate (River Cobble)
Silicon Dioxide (SiO2)
Mineral / Sedimentary (often associated with volcanic hosts)
Granite
Granite; predominantly quartz, potassium feldspar, plagioclase, and biotite/hornblende
igneous
Herkimer Diamond (Quartz)
Silicon Dioxide (SiO2)
mineral
Moss-covered Rock Fragment
Weathered Rock Fragment with Epilithic Growth
sedimentary
Sandstone
Arenite
sedimentary
Quartz (likely Herkimer Diamond style)
Silicon Dioxide (SiO2)
mineral
Asphalt (Bituminous Concrete)
Bituminous mix / Anthropogenic conglomerate
man-made composite (lithified equivalent of sedimentary)
Green glassy slag or manufactured glass bead
Noncrystalline silicate glass; likely industrial glass/slag, not a true mineral
mineral
Goldstone
Not a natural mineral or rock. It is an ornamental glass.
Manufactured Glass (Simulant)
Sandstone
Arenite (primarily SiO2)
sedimentary