Man Made Rock (Technosol)

Quartzite River Rock

Quartzite (SiO2)

Sandstone

Arenite (SiO2 based)

Sandstone (Quartz-rich)

Arenite (composed mainly of SiO2)

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

Granite (with alteration)

Granite (Felsic intrusive igneous rock)

Sandstone

Arenite (primarily composed of SiO2 - Silicon Dioxide)

Basalt (Weathered Pebble)

Extrusive mafic rock (primarily Plagioclase Feldspar and Pyroxene)

Clear/White Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Basalt

Basalt (containing Pyroxene, Plagioclase Feldspar, and Olivine)

Clear Quartz

Silicon Dioxide (SiO2)

Basalt (Water-worn pebble)

Mafic Igneous Rock (primarily Plagioclase feldspar and Pyroxene)

Granite

Granite (Felsic Plutonic Rock)

Basalt

Extrusive Mafic Igneous Rock

Basalt (Water-worn Pavement Stone)

Basalt (Mafic Extrusive Igneous Rock)

Granite

Granite (Mainly Quartz SiO2 and Feldspar KAlSi3O8)

Granite

Phaneritic Felsic Igneous Rock

Banded Calcite (often sold as 'Travertine' or 'Mexican Onyx')

Calcium Carbonate (CaCO3)

Sandstone

Arenite (Clastic Sedimentary Rock)

Sandstone (Beach Pebble)

Clastic sedimentary rock (primarily Quartz and Feldspar)

Basalt

Extrusive mafic igneous rock

Limestone

Calcium Carbonate (CaCO3)

Sandstone

Arenite (primarily SiO2)

Pink Feldspar

Orthoclase Feldspar (KAlSi3O8)

Quartz Vein on Matrix

Silicon Dioxide (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Sandstone

Arenite (SiO2 based)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Basalt (Water-worn Pebble)

Basalt (Aphanitic Mafic Igneous Rock)

Sandstone (likely Greywacke variant)

Arenite

Schist

N/A (a rock type, not a mineral formula)

Dalmatian Stone

Peralkaline Quartz-Feldspar Rock

Sandstone (with Concretion)

Arenite / Quartzose Sandstone

Sandstone (Quartzose)

Arenite (composed mainly of SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Peridot in Basalt

Olivine ((Mg, Fe)2SiO4) in Basalt

Unakite

Epidotized Granite

Sandstone

Arenite (SiO2 based with primary clasts 0.0625 to 2 mm)

Schist

Mica Schist (primarily consisting of muscovite KAl2(AlSi3O10)(OH)2 or biotite K(Mg,Fe)3(AlSi3O10)(OH)2)

Wishing Stone (Basalt/Greywacke with Quartz Vein)

Basalt or Siltstone with SiO2 (Quartz) hydrothermal intrusion