Metamorphic Rock

Gneiss

Gneiss

Clear Quartz

Silicon Dioxide (SiO2)

Quartz with Chalcopyrite and Pyrite

Silicon Dioxide (SiO2) with Copper Iron Sulfide (CuFeS2)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Serpentinite

Serpentinite (composed mainly of Group: Serpentine; (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Quartzite

Quartzite (SiO2 silicon dioxide)

Amethyst

Amethyst (Silicon Dioxide - SiO2)

Quartz / Quartzite

Silicon Dioxide (SiO2)

Unakite

Unakite (Altered Granite consisting of Orthoclase KAlSi3O8, Epidote Ca2(Al,Fe)3(SiO4)3(OH), and Quartz SiO2)

Dragon Blood Jasper

Epidote-containing Quartz Chalcedony (SiO2 with Ca2(Al, Fe)3(SiO4)3(OH))

Quartzite River Rock

Quartzite (Silicon Dioxide, SiO2)

Mica Schist

Mica Schist (KAl2(AlSi3O10)(OH)2 - Muscovite component)

Rough Star Sapphire (Corundum)

Al2O3 (Aluminum Oxide)

Quartzite

Quartzite (mainly SiO2)

Quartzite

Quartzite (SiO2)

Unakite

Unakite (Epidotized Granite)

Serpentine (Nephrite-like Serpentine)

Serpentinite (Hydrous magnesium iron phyllosilicate)

Quartz Pebble (Water-worn Quartzite)

Silicon Dioxide (SiO2)

Serpentine

Antigorite / Lizardite / Chrysotile mix; (Mg, Fe)3Si2O5(OH)4

Unakite

Epidotized Granite

Unakite

Epidotized Granite (SiO2, KAlSi3O8, Ca2(Al, Fe)3(SiO4)3(OH))

Serpentine (Nephrite-like River Cobble)

Serpentinite (Hydrous Magnesium Iron Silicate)

Agatized Petrified Wood

Silicon Dioxide (SiO2) - Chalcedony pseudomorph after Wood

Quartzite

Quartzite (primarily SiO2)

Banded Gneiss (with possible weathered sulfide or iron staining)

Gneiss, potentially with iron oxide/hydroxide staining (e.g., limonite) or weathered sulfides

Serpentinite

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

Yellow Quartzite

Quartzite (primarily SiO2)

Black Sand (Magnetite Sand)

Magnetite-rich Placers (Fe3O4)

Schist

Schist (primarily mica-schist)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Black Tourmaline (Schorl)

Schorl (Sodium iron silicate hydroxide boron silicate); NaFe3Al6(BO3)3Si6O18(OH)4

Quartzite (River Stone)

Quartzite (SiO2)

River Pebble (Quartzite/Chert)

Quartzite with inclusions (SiO2)

Quartzite

Quartzite (primarily SiO2)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartzite Pebble

Quartzite (SiO2 with minor impurities)

Charoite

Charoite (Hydrated potassium sodium calcium barium strontium silicate hydroxyfluoride)

Petrified Wood

Silicified wood (primarily Silicon Dioxide - SiO2)

Quartzite Pebble (Beach Stone)

Quartzite (primarily SiO2)

Quartz (Milky/Smoky variety)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (composed mainly of SiO2)