Metamorphic Or Mineral

Blue Sapphire

Corundum (Al2O3)

Magnetite

Magnetite (Fe3O4)

Smoky Quartz

Silicon Dioxide (SiO2)

Aventurine (Green Quartz)

Silicon Dioxide (SiO2) with inclusions of Fuchsite (Mica)

Smoky Quartz (Tumbled)

Smoky Quartz (Silicon Dioxide - SiO2)

Smoky Quartz

Smoky Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Schist

Mica Schist (Medium-grade Metamorphic Rock)

Quartz (Milky Quartz with Iron Staining)

Silicon Dioxide (SiO2)

Green Aventurine

Quartz (SiO2) containing Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

Soapstone / Steatite

Steatite (primarily Talc, Mg3Si4O10(OH)2)

Quartz (Raw Chunk)

Silicon Dioxide (SiO2)

Green Aventurine

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

Ruby (Corundum)

Aluminum Oxide (Al2O3) with Chromium traces

Clear Quartz

Silicon Dioxide (SiO2)

Granitic Gneiss

Gneiss (High-grade Metamorphic Rock)

Schist

Mica Schist (formula variable based on mineral content, typically containing [K,Al,Fe,Mg,Si,O,H])

Slate

Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)

Gneiss

Gneiss (Metamorphic rock composed primarily of quartz, feldspar, and mica)

Magnetite (likely in Hematite or Ironstone)

Magnetite (Fe3O4)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Clear/White Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon dioxide (SiO2)

Chalcopyrite

Chalcopyrite (CuFeS2)

Tiger's Eye

Tiger's Eye (a variety of Chalcedony, which is a microcrystalline quartz with fibrous inclusions of oxidized crocidolite)

Jade (Nephrite or Jadeite)

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)

Nuummite

Nuummite (intergrowth of orthoamphiboles Anthophyllite and Gedrite, (Mg,Fe)7Si8O22(OH)2)

Greenschist (Chlorite Schist)

Greenschist (containing chlorite, actinolite, and epidote)

Quartzite with inclusions

Quartzite (SiO2)

Milky Quartz Vein with Iron Staining

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Schist

Mica Schist (contains muscovite/biotite and quartz)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

Rutilated Quartz

Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions

Diorite (Gneissic)

Diorite

Quartz Pebble (Water-worn Quartzite)

Silicon Dioxide (SiO2)

Tiger's Eye

Pseudomorph of quartz after crocidolite (SiO2 with iron inclusions)

Agatized Petrified Wood

Silicon Dioxide (SiO2) - Chalcedony pseudomorph after Wood