Sedimentary Rock (Possibly A Conglomerate Or Coarse Grained Sandstone)

Greywacke

Lithic wacke (variety of Sandstone)

Yellow Quartzite (Iron-stained)

Quartzite (primarily SiO2 with Fe2O3 staining)

Fluorite in Matrix

Fluorite (CaF2) within a host rock matrix

Quartzite River Rock

Quartzite (SiO2)

Glauconitic Sandstone

Glauconitic Quartz-Wacke / Sandstone (Fe(II),Fe(III),Al,Mg)2-3(Si,Al)4O10(OH)2

Granite Pebble

Granite (a plutonic igneous rock composed primarily of quartz, feldspar, and mica/amphibole)

Black Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Breciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Diorite (with Iron Staining)

Phaneritic Intermediate Igneous Rock

Quartzite

Quartzite (SiO2)

Siltstone

Siltstone (composed of clastic quartz and feldspar)

Granite

Phaneritic Felsic Igneous Rock (composed primarily of Quartz and Alkali Feldspar)

Quartzite

Quartzite (SiO2)

Granite Pegmatite

Coarse-grained Granite (SiO2 - Aluminum and Alkalies)

Garnet Schist or Garnet-bearing Quartzite

Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

River Rock (River Cobbles)

Fluvial Conglomerate Clasts (primarily composed of various minerals such as Quartz, SiO2)

Ferruginous Sandstone

Arenite with Iron-Oxide Cement (SiO2 with Fe2O3/FeO(OH))

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Pink Granite (Potassium-rich Granite)

Phaneritic Felsic Igneous Rock (primarily SiO2, Al2O3, K2O)

Quartzite with Quartz Vein

Metamorphosed Quartz-rich Arenite (SiO2)

Granite

Granite (Felsic Plutonic Rock)

Diorite (Salt and Pepper Rock)

Diorite

Pink Granite

Granite (Phaneritic felsic intrusive igneous rock)

Riverstone Quartzite

Quartzite (primarily SiO2)

Red Granite

Phaneritic Plutonic Rock (High Potassium Feldspar)

Granite (specifically Pink Granite)

Phaneritic Plutonic Rock (High Potassium Feldspar Granite)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Crinoid Fossil in Limestone

Class Crinoidea in Carbonate Matrix (CaCO3)

Garnet (Almandine/Pyrope variety)

Silicate mineral group; typically Fe3Al2(SiO4)3 (Almandine) or Mg3Al2(SiO4)3 (Pyrope)

Quartzite Pebble (River Rock)

Quartzite (primarily SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Granite (weathered/river-tumbled)

Granite (Plutonic Igneous Rock)

Quartzite

Quartzite (SiO2)

Quartzite with Iron Inclusions

Metamorphic Quartzite (SiO2 with Fe2O3 trace impurities)

Ferruginous Quartzite (Iron-stained Quartzite)

Quartzite with Iron oxides (FeO(OH) / Fe2O3)

Granite

Phaneritic plutonic rock (composed of Quartz, Feldspar, and Mica/Amphibole)

Granite

Granite (Phaneritic Igneous Rock / Quartz, Feldspar, Mica)