Sedimentary Rock (Possibly A Conglomerate Or Coarse Grained Sandstone)

Red Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2 prominent)

Green Aventurine

Silicon Dioxide (Quartz) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

Granite (with Beryl/Aquamarine)

Granite (Feldspar, Quartz, Mica, and Beryl Be3Al2Si6O18)

Granodiorite

Phaneritic Granodiorite

Moqui Marble

Ironstone Concretion (Goethite/Hematite)

River Cobble (Quartzite and Iron-stained Quartz)

Quartzite (SiO2 with iron oxide impurities)

Quartzite

Quartzite (mostly SiO2)

Quartzite

Quartzite (SiO2)

Diabase (also known as Dolerite)

Diabase

Quartzite

Quartzite (chiefly SiO2)

Pegmatite with Smoky Quartz and Feldspar

Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8)

Quartzite

Quartzite (SiO2)

Quartzite Pebbles

Quartzite (SiO2)

Potassium Feldspar and Quartz

KAlSi3O8 (Potassium Feldspar) and SiO2 (Quartz)

Indigo Gabbro

Gabbro (composed of plagioclase feldspar, pyroxene, and olivine)

Granite

Granite

Quartzite Pebble

Metamorphic Quartzite (primarily SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (principally SiO2)

Gabbro

Gabbro

Granite

Granitoid

Quartzite

Quartzite (SiO2)

Quartzite with Hematite staining

Quartzite (SiO2) with iron oxide inclusions (Fe2O3)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Quartz (Quartzite)

Silicon Dioxide (SiO2)

Pink Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Sand Grain (Silica/Quartz Grain)

Silicon Dioxide (SiO2)

Quartzite pebble

Quartzite (SiO2)

Quartzite

Metamorphic Quartz (SiO2)