Mineral, Often Found As A Rock

Sandstone (likely River-tumbled Picture Sandstone)

Arenite (predominantly SiO2 with iron oxide impurities)

Chrysocolla

Hydrated copper silicates (Cu,Al)2H2Si2O5(OH)4·nH2O

Gneiss (specifically Granitic Gneiss)

Gneissic Metamorphic Rock

Granite with Mafic Inclusions

Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Sandstone (Red Flagstone)

Clastic sedimentary rock (primarily Quartz - SiO2)

Chert (concretionary/nodular variant)

Microcrystalline Quartz (SiO2) with possible fossil or mineral inclusions

White Agate (Chalcedony)

Silicon Dioxide (SiO2)

Hag Stone

Calcareous sedimentary rock (often Chert, Flint, or Limestone)

Schist with Quartz/Mica

Mica Schist (primarily Muscovite and Quartz)

Quartz (Iron-Stained or Milky Quartz)

Silicon Dioxide (SiO2)

Granitic Quartz with Feldspar

Granite (composed primarily of SiO2 and KAlSi3O8)

Granite

Granite (Felsic Plutonic Rock)

Red Jasper (Brecciated Jasper)

SiO2 (Silicon Dioxide) with Ferric Iron inclusions

Gneiss

Gneiss

Milky Quartz

Silicon Dioxide (SiO2)

Chert (variations include Flint or Jasper)

Silicon Dioxide (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Ferruginous Sandstone (Gerrit)

Arenite with Iron Oxide cementation

Charoite

Charoite (Hydrated potassium sodium calcium barium strontium silicate hydroxyfluoride)

Gneiss

Gneiss (High-grade metamorphic rock)

Sandstone (Quartzite Pebble)

Arenite (SiO2)

Graphite

Graphite (Carbon, C)

Sandstone (Ferruginous)

Arenite (SiO2 with Iron Oxide impurities)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Chrysocolla in Jasper (Chryso-Jasper)

Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O (Chrysocolla) + SiO2 (Jasper)

Basalt with Scoria

Amygdaloidal Basalt / Vesicular Basalt

Banded Agate (specifically Sardonyx Agate)

Silicon Dioxide (SiO2) - Chalcedony variety

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Granite Gneiss

Gneiss (High-grade metamorphic rock)

Desert Varnish (on Sandstone)

Rock Varnish (composed of Manganese oxides, Iron oxides, and Clay minerals)

Jasper with Quartz Veining

Silicon Dioxide (SiO2) - Opaque cryptocrystalline variety of Quartz

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Schist (Micaceous Schist)

Schist (comprising Muscovite/Biotite mica, Quartz, and Feldspar)

Turquoise

Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Amethyst Quartz

Silicon Dioxide (SiO2) with iron impurities

Sandstone Chert Concretion

Silica-cemented Concretion (primarily SiO2)

Yellow Jasper

Silicon Dioxide (SiO2)

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

Quartz Vein Outcrop

Silicon Dioxide (SiO2)

Conglomerate

Conglomerate (Sedimentary rock)