Metamorphic Rock (Variety Of Quartz)

Quartzite

Quartzite (primarily SiO2)

Quartzite with Iron Staining

Quartzite (primarily SiO2 with Fe2O3 staining)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

River Quartzite (or Quartz Cobble)

Quartzite (primarily Silicon Dioxide - SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Black Marble

Recrystallized Calcite (CaCO3)

Epidosite

Epidosite (composed primarily of Epidote and Quartz)

Chert (with Quartz Vein)

Chert (Siliceous sedimentary rock, predominantly Microcrystalline Quartz SiO2)

Gneiss

Gneiss

Quartz

Silicon Dioxide (SiO2)

Chert (Tan/Yellow variety)

Microcrystalline quartz (SiO2)

Agate (specifically a Banded Agate with a Quartz Druzy center)

Silicon Dioxide (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Puddingstone (specifically Michigan/Gowganda Puddingstone)

Conglomerate (Jasper Conglomerate)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Green Aventurine (Propably a tumbled variety)

Aventurine Quartz (SiO2 with inclusions of Fuchsite)

Quartz-veined Chert

Silicon dioxide (SiO2)

Milky Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Gneiss with Quartz Veining

Gneiss (High-grade regional metamorphic rock)

Chert (variations include Flint or Jasper)

Cryptocrystalline Quartz (SiO2)

Gneiss

Gneiss

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite or Iron Oxide inclusions

Unakite (Epidotized Granite)

Unakite (Rock composed of Epidote Ca2(Al,Fe)3(SiO4)3(OH), Orthoclase KAlSi3O8, and Quartz SiO2)

Chert (or Microcrystalline Quartz)

Chert (Silicon Dioxide, SiO2)

Quartzite with Chert inclusions

Metamorphosed Quartz-rich Rock (SiO2)

Green Aventurine

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

Chert / Jasper

Microcrystalline Quartz (SiO2)

Banded Gneiss

Gneiss (Metamorphic high-grade rock)

Orthoclase Feldspar

KAlSi3O8 (Potassium aluminum silicate)

Gneiss

Gneiss (a type of metamorphic rock)

Quartzite Pebble

Quartzite (SiO2)

Chert (Red/Brown Variety)

Microcrystalline quartz (SiO2)

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Serpentinite

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

Chert (Flint Nodules)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Gneiss

Gneiss

Jasper

Silicon dioxide (SiO2)