Basalt (with possible mineral veining)
Basalt (Aphanitic Mafic Igneous Rock)
Igneous
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Red Sandstone (Iron-rich)
Arenite (with Hematite cement)
sedimentary
Breciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Peridotite (Dunite)
Peridotite (mostly Olivine: (Mg,Fe)2SiO4)
igneous
Chert with Quartz/Calcite Vein
Microcrystalline Silica (SiO2)
sedimentary
Mica Schist
Mica Schist (Composition: Muscovite, Biotite, Quartz, Feldspar)
metamorphic
Basalt and Quartz Pebble
Basalt (Igneous) and Quartzite/Quartz (SiO2) pebble
igneous and sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Schist (Kyanite Schist)
Kyanite-Mica Schist (primarily Al2SiO5, KAl2(AlSi3O10)(OH)2, and SiO2)
metamorphic
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and clay inclusions
sedimentary
Agate (Banded Chalcedony)
Cryptocrystalline Silica (SiO2)
mineral
Greenshist / Chlorite Schist
Chlorite schist (contains (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)
metamorphic
Quartz Sand/Gravel
Silicon Dioxide (SiO2)
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Labradorite (White/Grey Labradorite)
Labradorite: (Ca, Na)(Al, Si)4O8
mineral
Granite
Phaneritic Igneous Rock (Granite)
igneous
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Diorite
Diorite (plutonic igneous rock)
igneous
Basalt
Basalt
igneous
Herkimer Diamond (Quartz Crystal)
Silicon Dioxide (SiO2)
mineral
Granodiorite Pebble
Granodiorite (containing Quartz, Plagioclase Feldspar, and Biotite/Amphibole)
igneous
Asphalt (Bituminous Concrete)
Bituminous Concrete / Pavement
man-made (synthetic rock)
Sandstone (Quartzose Sandstone)
Arenite (SiO2 principal component)
sedimentary
Basalt River Stone with Quartz Vein
Basalt (Mafic volcanic rock)
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
mineral
Gneiss (specifically Granite Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Basalt Pebble
Aphanitic Mafic Igneous Rock
igneous
Amethyst
Quartz (Silicon Dioxide with iron impurities), SiO2
mineral
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Quartz (Pebble)
Quartz (SiO₂)
Mineral
Gneiss
Metamorphic Rock (Gneissic texture)
metamorphic
Turquoise (set in silver jewelry)
Turquoise - CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Wishing Stone (Quartz-Veined Basalt)
Amygdaloidal Basalt with Quartz (SiO2) vein
igneous
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral