Metamorphic

Quartzite

Quartzite (primarily SiO2)

Quartzite with inclusions

Metamorphosed Quartz-rich Rock (SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (SiO2 principal component)

Lapis Lazuli

Lapis Lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Pyrite, and Calcite)

Gneiss (specifically a Banded Gneiss cobble)

Gneiss (composed mainly of Quartz, Feldspar, and Biotite/Amphibole)

Quartzite

Quartzite (SiO2)

River Cobble (likely Quartzite or Chert)

Quartzite (SiO2)

Quartzite River Rock

Quartzite (primarily SiO2)

Quartzite (Gold/Yellow)

Quartzite (SiO2)

Gneiss (Granitic Gneiss)

Gneiss

Red Quartzite

Quartzite (SiO2 with iron oxide impurities)

River Cobble (Quartzite)

Meta-orthoquartzite

Quartzite pebble

Quartzite (SiO2 dominated)

Stichtite in Serpentine (Atlantisite)

Mg6Cr2CO3(OH)16·4H2O (Stichtite) within Mg3Si2O5(OH)4 (Serpentine)

Yellow Quartzite Pebble

Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite Pebble (with iron staining)

Quartzite (SiO2 with ferric oxide impurities)

Green Aventurine (Fuchsite-bearing Quartzite)

Silicon Dioxide (SiO2) with Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Quartzite River Stone

Quartzite (SiO2)

Serpentinite

Serpentinite (complex of lizardite, chrysotile, and antigorite: (Mg,Fe)3Si2O5(OH)4)

Connemara Marble

Ophiocalcite (Serpentinitic Marble)

Quartzite

Quartzite (primarily SiO2)

Tiger's Eye (Tumbled Blue/Black-Golden variety)

Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)

Serpentine

Serpentinite (complex of Mg, Fe, Ni, Al, Zn, Mn)Si2O5(OH)4

Quartzite (Iron-stained)

Quartzite (SiO2)

Tiger Iron

Tiger Iron (A complex combination of Hematite Fe2O3, Red Jasper SiO2, and Tiger's Eye SiO2/FeOOH)

Epidosite (Epidote-rich rock)

Epidosite (consisting primarily of Epidote: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

Quartzite

Quartzite (primarily SiO2)

Blue Kyanite

Kyanite (Al2SiO5)

Riverstone Quartzite

Quartzite (primarily SiO2)

Agatized Petrified Wood

Silicon Dioxide (SiO2) - Chalcedony pseudomorph after Wood

Mica Schist

Mica Schist

Quartzite

Quartzite (SiO2)

Quartzite with vugs/druzy quartz

Crystalline Silicon Dioxide (SiO2)

Quartzite River Rock (with Limonite staining)

Quartzite (SiO2)

Quartzite (Beach Pebble)

Quartzite (primarily SiO2)

Tiger's Eye

Pseudomorph of quartz after crocidolite (SiO2 with iron inclusions)

Riverstone Quartzite

Quartzite (primarily SiO2)

Pink Quartzite (Water-worn)

Quartzite (SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Petrified Wood

Silicified Wood (SiO2)