Metamorphic

Quartzite (River-worn pebble)

Quartzite (Mainly SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Greenstone (Epidosite or Altered Basalt)

Epidosite (Ca2(Al, Fe)3(SiO4)3(OH))

Smoky Quartz and Biotite Schist

Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (predominantly SiO2)

Quartzite

Quartzite (primarily SiO2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)

Gneiss (specifically Banded Gneiss)

Gneiss

Nephrite Jade

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

Nephrite Jade (River Cobble)

Nephrite (Silicate mineral: Ca2(Mg, Fe)5Si8O22(OH)2)

Quartzite

Quartzite (primarily SiO2)

Quartzite Pebbles

Meta-quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Greenstone (Epidote/Chlorite-rich Metabasalt)

Greenschist / Epidosite (Ca2(Al,Fe)3(SiO4)3(OH))

Quartzite

Quartzite (primarily SiO2)

Falcon's Eye (Blue Tiger's Eye)

Pseudomorph of Quartz after Crocidolite (SiO2)

Quartzite

Quartzite (SiO2)

Tiger's Eye (Blue-Gold transition)

Pseudomorph of Quartz after Crocidolite (SiO2)

Orange Quartzite (or Salmon Quartzite)

Quartzite (SiO2)

Grey Quartzite Pebble

Quartzite (primarily SiO2)

Yellow Quartzite (Iron-stained Quartz)

Silicon Dioxide (SiO2) with iron oxide staining

Quartzite

Quartzite (SiO2)

Mica Schist

Mica Schist (primarily Muscovite and Quartz)

Tiger's Eye

Pseudomorph of quartz after crocidolite (SiO2 with iron inclusions)

Red Quartzite

SiO2 (Silicon Dioxide with iron oxide impurities)

Anthracite Coal

Anthracite

Quartzite Pebble

Quartzite (SiO2 with minor impurities)

Quartzite Pebble

Meta-quartzite

Unakite

Unakite epidotized granite

Quartzite

Quartzite (primarily SiO2)

Gneiss (specifically Banded Gneiss)

Gneiss

Tiger Iron

Tiger Iron (composite of Tiger's Eye, Red Jasper, and Hematite)

Quartzite Pebble

Metamorphosed Sandstone (SiO2)

Unakite

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

Biotite Schist

Biotite Schist (Rich in K(Mg,Fe)3AlSi3O10(OH)2)

Schist

Mica Schist (primarily Muscovite and Biotite)

Fuchsite (Green Muscovite in Quartz)

K(Al,Cr)2(AlSi3O10)(OH)2 - Chromium-rich Muscovite

Lapis Lazuli

Lapis Lazuli (Aggregate primarily of Lazurite: (Na,Ca)8(AlSiO4)6(S,SO4,Cl,1-2) with Calcite and Pyrite)

Pink Quartzite

Metamorphosed Quartz Arenite (SiO2)

Ferruginous Quartzite (also known as Ironstone or Gossan)

Ferruginous Quartzite with Goethite/Hematite staining

Quartzite

Hydrothermal Quartz or Quartzite (SiO2)