Metamorphic Rock

Red Quartzite (Tumbled Pebble)

Quartzite (primarily SiO2 with hematite inclusions)

Green Quartzite (with Fuchsite)

Quartzite with Muscovite variety Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

Blue Apatite

Fluorapatite / Chlorapatite [Ca5(PO4)3(F,Cl,OH)]

Agate

Silicon Dioxide (SiO2) - Chalcedony variant

Dyed Agate

SiO2 (Silicon Dioxide)

Agate

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Schist

Mica Schist (predominantly Muscovite or Biotite)

Moonstone

Orthoclase Feldspar (composed of alternate layers of orthoclase and albite), (K,Na)AlSi3O8

Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Blue Sapphire

Corundum (Al2O3) with traces of Iron and Titanium

Agate (Laguna or Lace variety pattern)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Green Schist

Greenschist (composed of Chlorite, Actinolite, and Epidote)

Iron-Stained Quartzite

Recrystallized Meta-Quartzite (primarily SiO2)

Tiger's Eye (Rough)

Pseudomorph of Quartz after Crocidolite (SiO2)

Gneiss

Gneiss

Gneiss with Quartz/Feldspar Vein

Quartz-Feldspathic Gneiss

Green Aventurine

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

Quartzite

Quartzite (SiO2)

Gneiss (Granitic Gneiss)

Gneiss (from German Gneis, related to 'spark')

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Metasedimentary or Igneous Matrix

Epidote

Epidote Group (e.g., Clinozoisite, Epidote, Piemontite), Epidote formula: Ca2(Al,Fe)3(SiO4)3(OH)

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Blue Quartz (Dumortierite Quartz)

SiO2 containing inclusions of Dumortierite [Al7(BO3)(SiO4)3O3]

Magnetite (potentially as a Lodestone or within Ironstone)

Magnetite (Fe3O4)

Serpentine

Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Clear Quartz

Silicon Dioxide (SiO2)

Biotite Mica

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)

Quartzite with Hematite staining

Quartzite (SiO2)

Pink Quartzite

Quartzite (mainly SiO2 with iron oxide impurities)

Red Quartzite / Ferruginous Quartzite

Quartzite (primarily SiO2 with Fe2O3 inclusions)

Quartzite River Cobble

Quartzite (primarily SiO2)

Serpentinite

Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)

Epidotite (Unakite variety)

Epidotized Granite (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Granitic Pegmatite

Granitic Pegmatite with Quartz and Feldspar

Quartzite

Quartzite (SiO2)

Red Quartzite

Quartzite (principally SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3Si2O5(OH)4