Metamorphic

Anthracite

Anthracite Coal

Charoite

Charoite (Hydrated potassium, sodium, calcium, barium, strontium silicate hydroxide fluoride)

Lapis Lazuli

Lapis Lazuli (A complex rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Green Aventurine

Silicon Dioxide (Quartz variety) with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Graphite-veined Quartzite

Meta-sedimentary Quartzite with Carbonaceous/Graphitic Inclusions (SiO2 + C)

Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions) - SiO2

Red Tiger's Eye

Silicified Crocidolite (Quartz pseudo-morph after Crocidolite), SiO2

Banded Iron Formation (BIF) / Tiger Iron

Ferruginous Chert (primarily Quartz [SiO2] and Hematite/Magnetite [Fe2O3/Fe3O4])

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Gneiss (Schistose)

Gneiss

Quartzite pebble

Quartzite (SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite

Quartzite (SiO2)

Red Quartzite Cobble

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite Pebble

Quartzite (composed primarily of Silica, SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (Primary mineral: SiO2)

Schist

Mica Schist

Quartzite

Quartzite (predominantly SiO2)

Quartzite (Yellow/Tan river stone variety)

Quartzite (primarily SiO2)

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Pink Quartzite

Quartzite (mainly SiO2 with iron oxide impurities)

Quartzite

Quartzite (SiO2)

Lapis Lazuli

Na8[Al6Si6O24]S2

Tiger's Eye

Pseudomorph of quartz after crocidolite (SiO2)

River Quartzite (River Stone)

Quartzite (primarily SiO2)

Charoite

Charoite (Hydrated potassium sodium calcium barium strontium silicate hydroxyfluoride)

Quartzite

Quartzite (SiO2)

Quartzite (Lithic Artifact)

Quartzite (SiO2)

Shungite (Noble/Type II)

Non-crystalline carbon (Fullerene-bearing carbonaceous rock)

Riverstone Quartzite (Iron-stained)

Quartzite (primarily SiO2 with Limonite/Goethite staining)

Quartzite Pebble

Quartzite (mostly SiO2)

Mica Schist

Mica Schist (primarily Muscovite and Biotite micas)