Metamorphic (Likely Gneiss Or Schist Based On Texture)

Brown Quartzite Pebble

Metadiagenetic Quartzite (primarily SiO2)

Quartzite (River Pebble)

Quartzite (composed primarily of Silica, SiO2)

Quartzite

Quartzite (composed primarily of SiO2)

Quartzite River Rock (with Quartz Vein)

Quartzite (SiO2)

Blue Quartzite

Quartzite with inclusions (often Dumortierite or Magnesio-riebeckite)

Tiffany Stone

Fluoritized Opal Beryllium Ore (principally Bertrandite, Be4Si2O7(OH)2)

Glauconitic Sandstone (Greenstone)

Glauconitic Siliciclastic Sandstone (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2

Raw Green Aventurine

Aventurine Quartz (SiO2 + Fuchsite)

Quartzite

Quartzite (primarily SiO2)

Tiger's Eye

Pseudomorph of quartz after crocidolite (SiO2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

Green Quartzite (Aventurine-like)

Quartzite (primarily SiO2 with chromium-rich mica or chlorite inclusions)

Quartzite River Rock

Quartzite (primarily SiO2)

Slate with Pyrite Inclusions

Foliated Metamorphic Rock (with Iron Sulfide FE-S2)

Quartzite Pebble

Quartzite (SiO2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)

Quartzite Pebble

Recrystallized Quartz (SiO2)

Eclogite

Eclogite

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Glauconitic Sandstone (or Greensand)

Glauconitic Siliciclastic Rock (Containing (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Quartzite (River-worn Cobble)

Quartzite (composed primarily of SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Yellow Quartzite Pebble

Metamorphosed Sandstone (SiO2 with iron oxide impurities)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite (River Pebble)

Metamorphosed Quartz-rich Sandstone (SiO2)

Serpentinite (River Pebble)

Serpentinite (complex of Antigorite, Lizardite, and Chrysotile: Mg3Si2O5(OH)4)

Quartzite

Quartzite (primarily SiO2)

Red Quartzite / Ferruginous Quartzite

Quartzite (SiO2 with Iron Oxide impurities)

Orange Quartzite (River Pebble)

Quartzite (SiO2 with Iron Oxide inclusions)

Quartzite Pebble

Quartzite (SiO2 with minor impurities)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Quartzite (Potentially Ferruginous)

Quartzite (SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Pink Quartzite

Quartzite (SiO2)

Green Aventurine

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

Quartzite

Quartzite (composed primarily of SiO2)

Quartzite River Rock

Quartzite (primarily SiO2)

Quartzite

Quartzite (chiefly SiO2)

Quartzite

Quartzite (SiO2)

Green Quartzite (or Aventurine)

SiO2 (Silicon Dioxide) primarily, with Fuchsite inclusions (K(Al,Cr)2AlSi3O10(OH)2)