Metamorphic Rock

Epidote

Epidote (formula: Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Shungite

Non-crystalline carbon (similar to anthracite coal or meta-anthracite)

Quartzite

Quartzite (predominantly SiO2)

Unakite

Unakite (Epidotized Granite)

Lapis Lazuli (Tumbled Specimen)

Lapis Lazuli (Aggregate rock containing Lazurite: (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)

Quartzite Pebbler

Quartzite (mainly SiO2)

Unakite

Epidotized Granite

Unakite

Unakite (Metasomatized Granodiorite)

Unakite

Epidotized Granite

Quartzite River Pebble

Quartzite (primarily SiO2)

Quartzite (Quartz-rich Cobble)

Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Unakite

Unakite Lepidolite

Unakite

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

Arkosic Sandstone (or Conglomeritic Sandstone fragment)

Arkose (rich in feldspar)

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Mica Schist

Mica Schist (Composition typically contains Muscovite: KAl2(AlSi3O10)(OH)2 or Biotite: K(Mg,Fe)3AlSi3O10(OH)2 along with Quartz and Feldspar)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz with Mica Schist (Pegmatite Specimen)

SiO2 (Silicon Dioxide) and Phyllosilicates (Biotite/Muscovite)

Quartz (specifically Clear Quartz or Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Quartzite Pebble (River Rock)

Quartzite (mainly SiO2)

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Muscovite Mica

Muscovite (Potassium Aluminum Silicate Hydroxide Fluoride), KAl2(AlSi3O10)(OH,F)2

Quartzite

Quartzite (composed primarily of SiO2)

Aventurine

Quartzite with inclusions (SiO2 containing Fuchsite chrome mica)

Quartzite

Quartzite (SiO2)

Ruby in Fuchsite (often confused with Ruby in Zoisite)

Corundum (Al2O3) in Chromium-rich Muscovite (KAl2(AlSi3O10)(OH)2)

Dyed Pink Quartzite (Jadeite Simulant)

Silicon Dioxide (SiO2) with organic dye

Quartzite with Iron Mineral Banding

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) staining

Quartzite River Stone

Quartzite (primarily SiO2)

Unakite

Epidotized Granite

Schist

Mica Schist

Quartz

Quartz (SiO2)

Blue Kyanite

Kyanite (Al2SiO5)

Mica Schist

Mica Schist (primarily Muscovite and Biotite composition)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)