Sandstone (Arkose/Quartzose)
Arenite (SiO2 based clastic rock)
sedimentary
Category
Not A Rock (Synthetic Material)
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Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Scoria
Scoria (Vesicular Basaltic Rock)
igneous
Sandstone
Arenite (SiO2 principal)
sedimentary
Banded Jasper
Silicate Mineral (Microcrystalline Quartz / SiO2)
sedimentary
Granite
Phaneritic plutonic igneous rock
igneous
Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Rounded granitic pebble
Granite, likely biotite granite or granodiorite
igneous
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Geode (unopened)
Chert / Chalcedony Geode (SiO2)
sedimentary
Sandstone (likely Arkosic or Lithic Sandstone)
Clastic Sedimentary Rock (SiO2 with assorted minerals)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (specifically sublithic or quartz arenite)
sedimentary
Shale
Mudrock / Fissile Shale
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Granite (Plutonic Igneous Rock)
igneous
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Polished/tumbled quartz-rich pebble, possibly jasper or quartzite
Indeterminate; likely microcrystalline quartz (SiO₂), potentially iron-stained jasper or quartzite
metamorphic
Sandstone (likely Quartz Sandstone)
Arenite (SiO2 based)
sedimentary
Banded River Cobble with Mafic Dike
Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion
igneous and sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Fossil Shell
Brachiopod or Mollusk fossil
fossil
Unidentified weathered rock, possibly quartz-bearing granite or rhyolite
Indeterminate; likely quartz–feldspar-rich silicate rock
igneous
Quartzite (Iron-stained)
Quartzite (SiO2 with Fe2O3 staining)
metamorphic
Concrete Rubble with Aggregate
Hardened Portland Cement Paste with Coarse Aggregate
Anthropogenic (Man-made)
Glacial Erratic (Sandstone/Quartzite)
Glacial Erratic specimen (likely Orthoquartzite or Feldspathic Sandstone)
sedimentary or metamorphic
Weathered quartz-rich rock, possibly quartzite or quartz vein material
Quartz (SiO₂), likely with feldspar, mica, and iron-oxide staining
metamorphic
Seashell Fossil
Gastropoda fossil
fossil
Likely weathered mica schist fragment
Mica schist, chiefly muscovite/biotite mica with quartz and feldspar
metamorphic
Chert (Common Opal or Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Brachiopod
Brachiopoda (Phylum)
fossil
Basalt
Aphanitic Mafic Igneous Rock
igneous
Sandstone
Clastic sedimentary rock (primarily quartz arenite)
sedimentary
Sandstone
Arenite (SiO2 dominated sandstone)
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary