Metamorphic Rock (Variety Of Quartz)

Sandstone (with Lichen)

Arenite (primarily SiO2)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Quartzite River Pebble

Metamorphosed Quartz Sandstone (SiO2)

Banded Gneiss

Gneiss

Granite

Granite (Felsic Plutonic Rock)

Sardonyx Cameo

Silicon Dioxide (SiO2) - variety Cryptocrystalline Quartz

Quartzite pebble

Quartzite (SiO2)

Serpentine

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

Milky Quartz (with trace inclusions)

Silicon Dioxide (SiO2)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Beryl (var. Heliodor or Aquamarine)

Beryllium Aluminum Cyclosilicate (Be3Al2Si6O18)

Raw Emerald in Schist Matrix

Beryl (Be3Al2Si6O18) in Mica Schist

Massive Quartz with Host Rock

Silicon Dioxide (SiO2)

Serpentine

Antigorite, Lizardite, or Chrysotile (Mg,Fe)3Si2O5(OH)4

Quartzite

Quartzite (SiO2)

Quartzite Pebble

Quartzite (SiO2)

Quartz (specifically Milky or Clear Quartz fragment)

Silicon Dioxide (SiO2)

Serpentinite

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

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Greenstone / Serpentinite

Serpentinite (composed primarily of minerals from the serpentine group Mg3Si2O5(OH)4)

Green Quartzite (or Aventurine)

SiO2 (Silicon Dioxide) primarily, with Fuchsite inclusions (K(Al,Cr)2AlSi3O10(OH)2)

Tumbled Carnelian and Quartz Mix

Silicon Dioxide (SiO2) with iron oxide impurities

Diorite (Dalmatian Stone variant)

Phaneritic Plutonic Igneous Rock (Medium to Fine-grained Diorite)

Gneiss

Gneiss

Unakite

Epidotized Granite

Smoky Quartz

Silicon Dioxide (SiO2)

Quartzite River Rock (with Quartz Vein)

Quartzite (SiO2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Chert (Nodule)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Unakite

Unakite (Epidotized Granite)

Quartzite River Rock

Metamorphic Quartzite (primarily SiO2)

Quartzite

Quartzite (SiO2)

Quartzite River Stone

Quartzite (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Quartzite (Iron-stained)

Quartzite (SiO2)

Chert (often called Flint or Jasper)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Tiger's Eye (commonly referred to as Blue/Gold Tiger's Eye)

Tiger's Eye is a variety of Chalcedony (cryptocrystalline quartz), SiO2, exhibiting chatoyancy. The blue variety is often called Hawk's Eye.

Green Opal

Hydrated Silica (SiO2·nH2O)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)

Chert (Basanite variety) with Quartz Vein

Microcrystalline Quartz (SiO2)

Greenschist with Quartz Veining

Greenschist (commonly containing Chlorite, Actinolite, and Epidote)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)