Sedimentary Rock (Specifically A Chemical Sedimentary Rock, Or A Chert If Considered Purely Mineral Aggregate)

Quartz (Milky or Cloudy Quartz)

Silicon Dioxide (SiO2)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide staining)

Sandstone

Clastic Sedimentary Rock (composed mostly of SiO2)

Dalmatian Jasper (or Dalmatian Stone)

Dalmatian Stone (A peralkaline felsite composed of feldspar, quartz, and sodic amphibole)

Banded Gneiss

Gneiss (complex metamorphic silicate rock)

Agate (Carnelian-Blue Agate mix)

Silicon Dioxide (SiO2)

Red Sandstone

Arenite (predominantly SiO2 with Fe2O3 staining)

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

Sandstone (likely Fossilized Wood or Concrete Simulacrum)

Arenite / Silicified Wood / Anthropogenic Concrete

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Gneiss

Gneiss (high-grade metamorphic rock typically composed of quartz, feldspar, and mica)

Fossilized Coral (Petoskey-like or Favosites)

Anthozoa (Fossilized Coral)

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Carnelian

Carnelian (Silicon Dioxide - SiO2)

Carnelian

Carnelian (a variety of Chalcedony); SiO2 (Silicon Dioxide)

Amethyst Geode

Silicon Dioxide with trace inclusions of Iron (SiO2)

Carnelian (a variety of Chalcedony)

Cryptocrystalline Quartz (SiO2) with iron oxide inclusions

Blue Chalcedony

Silicon Dioxide (SiO2)

Pink Granite Gneiss

Granitic Gneiss

Sandstone Concretion

Sandstone (Sedimentary Rock) with silica or calcite cement

Gneiss with Quartz/Feldspar Vein

Quartz-Feldspathic Gneiss

Smoky Quartz and Biotite Schist

Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)

Red Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

Petrified Wood

Silicified Wood (primarily Chalcedony or Quartz, SiO2)

Sandstone (with vugs or solution cavities)

Arenite (primarily Quartz and Feldspar with CaCO3 or SiO2 cement)

Sandstone (with Iron Staining)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Sandstone

Arenite (composed primarily of Quartz: SiO2)

Sandstone (Red Sandstone)

Arenite (primarily Quartz with Hematite cement)

Laterite

Laterite (no specific mineral formula as it's a rock type)

Ocean Jasper

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Chakra Stone (Composite / Man-made Bonded Gemstones)

Composite of Quartz, Lapis Lazuli, Aventurine, Tiger's Eye, and Jasper (SiO2, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, etc.)

Quartz / Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Amber

Succinite (with formula approximately C10H16O)

Moqui Marble (Shaman Stone)

Iron Oxide Concretion (Goethite/Hematite shell with Sandstone core)

Garnet-Mica Schist

Garnetiferous Porphyroblastic Schist

Red Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Quartz Geode (partially formed/chalcedony with iron staining)

Quartz (SiO2) with Chalcedony (cryptocrystalline quartz) and likely Iron Oxides/Hydroxides

Quartz River Pebbles

Silicon Dioxide (SiO2)

Chalcedony in Matrix

Silicon Dioxide (SiO2)

Hag Stone (Sandstone with Boreholes)

Bored Sandstone (Sedimentary rock with lithophaga-style borings)

Breccia

Clastic Breccia (General mineral composition depends on fragments, often SiO2 or CaCO3)