Metamorphic Rock

Quartzite Pebble (River Rock)

Quartzite (SiO2)

Blue Sapphire

Corundum (Al2O3)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartzite

Quartzite (SiO2 silicon dioxide)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chakra Stone (Composite / Man-made Bonded Gemstones)

Composite of Quartz, Lapis Lazuli, Aventurine, Tiger's Eye, and Jasper (SiO2, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, etc.)

Beryl (likely Aquamarine) in matrix

Be3Al2(SiO3)6 (Beryllium Aluminum Silicate)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz (Crystal Cluster)

Silicon Dioxide (SiO2) - Quartz Variety

Schist

Schist (various mineralogical compositions including mica, chlorite, talc, etc.)

Granodiorite (Gneissic Pebble)

Granodiorite displaying minor foliation

Muscovite on Quartz (Mica host rock)

KAl2(AlSi3O10)(OH)2 (Muscovite) in SiO2 (Quartz)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Epidosite (Epidote-rich rock)

Epidosite (consisting primarily of Epidote: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

Quartzite

Quartzite (primarily SiO2)

Pink Quartzite

Quartzite (SiO2 with iron oxide inclusions)

Pink Quartzite (Water-worn)

Quartzite (SiO2)

Quartzite Pebble

Quartzite (SiO2)

Quartzite

Quartzite

Mica Schist

Mica Schist (primarily Muscovite and Biotite phyllosilicates)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

River Rock (Quartzite/Chert conglomerate)

Quartzite (SiO2)

Smoky Quartz in Matrix

Silicon dioxide (SiO2) within Pegmatite/Gneiss

Quartz (likely tumbled or naturally water-worn)

Quartz (SiO₂ - Silicon Dioxide)

Quartz Vein in Host Rock (Gabbro or Basalt)

Silicon Dioxide (SiO2) with Mafic Silicates

Quartz

Quartz (SiO₂)

Green Druzy Quartz (Prasiolite)

Silicon Dioxide (SiO2) with inclusions (typically Chlorite or Actinolite)

Gold Ore in Matrix

Native Gold (Au) in Quartz/Host Rock

Shungite (Noble/Type II)

Non-crystalline carbon (Fullerene-bearing carbonaceous rock)

Inspirational River Stone (Quartzite)

Metamorphosed Quartz-rich Rock (Quartzite) with SiO2 composition

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Glacial Erratic (Sandstone/Quartzite)

Glacial Erratic specimen (likely Orthoquartzite or Feldspathic Sandstone)

Clear Quartz (or Rock Crystal)

Quartz (SiO₂)

Quartz

Silicon Dioxide (SiO2)

River Rock (likely Quartzite or Quartz-rich Siltstone)

Quartzite (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Epidote (or Epidote-rich rock)

Epidote. Mineral formula: Ca2(Al,Fe)3(SiO4)3(OH).

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)