Man Made Metamorphic Style Composite

Pyrite

Iron Sulfide (FeS2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz Pebble (Citrine-colored or Stained Quartz)

Silicon Dioxide (SiO2)

Pyrite on Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Nephrite Jade

Tremolite-Actinolite solid solution Ca2(Mg,Fe)5Si8O22(OH)2

Quartzite (River Cobble)

Metamorphosed Quartz Sandstone (SiO2)

Quartzite Pebble

Quartzite (SiO2)

Quartzite

Quartzite (composed primarily of Quartz, SiO2)

Quartzite

Quartzite (primarily SiO2)

Pink Quartzite

Quartzite (primarily SiO2)

Quartzite (tumbled or water-worn)

Quartzite (composition: SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

White Marble

Recrystallized Calcite (CaCO3)

Quartzite

Hydrothermal Quartz or Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartzite (Milky Quartz Cobble)

Silicon Dioxide (SiO2)

Quartz Veined Rock (Likely Graywacke or Quartzite)

Silicon Dioxide (SiO2) veins in Metasedimentary matrix

Red Quartzite River Pebble

Quartzite (SiO2 with iron oxide inclusions)

Greenstone

Protolith of basalt, diabase, or gabbro; often contains minerals like chlorite, actinolite, and epidote

River Cobble (Phyllite or Quartzite)

Metasedimentary Rock (often containing SiO2 or KAl2(AlSi3O10)(OH)2)

Quartzite (Iron-stained)

Quartzite (primarily SiO2)

Quartzite

Quartzite (SiO2 silicon dioxide)

Quartzite Pebble (with Quartz veins)

Quartzite (SiO2)

Blue Quartzite (Aventurine variety)

Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebeckite

Greenstone

Greenschist (metamorphosed mafic igneous rock)

Quartzite Cobble

Metamorphosed Quartz Sandstone (primarily SiO2)

Serpentine (variety: Serpentine Rock)

Antigorite, Lizardite, or Chrysotile; formula generally (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Serpentine (Serpentinite)

Antigorite, Lizardite, or Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Serpentinite

Serpentinite (complex silicate minerals including Lizardite, Antigorite, and Chrysotile)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Serpentine

Antigorite / Lizardite / Chrysotile (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Petrified Wood

Silicified Wood (SiO2)

Sandstone

Sandstone (composed primarily of sand-sized minerals or rock grains)

Limestone

Calcium Carbonate (CaCO3)

Granite Pebble

Granite (composed primarily of Quartz, Feldspar, and Mica)

Limestone Pebble

Sedimentary Calcium Carbonate (CaCO3)

Quartz in Matrix (possibly with Biotite or Hornblende)

Quartz (Silicon Dioxide, SiO2) in Granitic Matrix

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Quartz Pebble

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2) / Rock Crystal