Metamorphic

Stichtite in Serpentine (Atlantasite)

Mg6Cr2CO3(OH)16·4H2O in Mg3Si2O5(OH)4

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Blue Quartzite

Quartzite (primarily SiO2 with inclusions)

Quartzite

Quartzite (primarily SiO2)

Fuchsite in Quartz

K(Al,Cr)2(AlSi3O10)(OH)2 (Muscovite with Chromium)

White Jade / Jadeite

NaAlSi2O6 (Sodium Aluminum Silicate)

Serpentinite

Serpentinite ((Mg,Fe,Ni,Al)3Si2O5(OH)4)

Greisen

Greisen

Lapis Lazuli

Lapis lazuli (Mainly Lazurite: Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Unakite

Unakite (altered granite)

Dragon Blood Jasper (also known as Dragon Stone)

Epidotized septarian concretion or Jasper/Epidote breach (typically a combination of Epidote and Pietersite or Red Jasper)

Orange Quartzite (River Pebble)

Quartzite (primarily SiO2)

White Marble (often sold as Caribbean Calcite or Pistachio Calcite in this form)

Recrystallized Calcite (CaCO3)

Unakite (or Epidote-rich Granite)

Unakite (composed of Epidote {Ca2(Al, Fe)3(SiO4)3(OH)}, Pink Orthoclase Feldspar {KAlSi3O8}, and Quartz {SiO2})

Yellow Quartzite (River Pebble)

Quartzite (primarily SiO2)

Anthracite Coal

Anthracite

Quartzite (River Stone)

Silicon Dioxide (SiO2)

Quartzite (River Pebble)

Metamorphosed Quartz-rich Sandstone (SiO2)

Quartzite

Quartzite (SiO2)

Quartzite (River Stone)

Quartzite (composed primarily of Silicon Dioxide, SiO2)

White Marble

Recrystallized Calcite (CaCO3)

Mica Schist

Mica Schist

Riverstone Quartzite (Water-worn Siltstone/Quartzite)

Metamorphosed Quartz-rich Arenite (SiO2)

Tiger's Eye

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

Quartzite

Quartzite (SiO2)

Yellow Quartzite Pebble

Quartzite (SiO2)

Serpentinite (River Pebble)

Serpentinite (complex of Antigorite, Lizardite, and Chrysotile: Mg3Si2O5(OH)4)

Green Aventurine

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

Serpentinite (Commonly known as Serpentine)

Antigorite, Lizardite, or Chrysotile [(Mg,Fe)3Si2O5(OH)4]

Yellow Aventurine

Quartzite with Muscovite/Sericite inclusions (SiO2 + KAl2(AlSi3O10)(OH)2)

Marble

Recrystallized Calcite Rock (CaCO3)

Lapis Lazuli

Lapis Lazuli (Primary mineral: Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Unakite

Epidotized Granite

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Unakite

Unakite (Epidotized Granite)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

Blue Aventurine

Quartzite with Dumortierite inclusions (SiO2 + Al7(BO3)(SiO4)3O3)

Quartzite (specifically a river-worn pebble)

Quartzite (primarily SiO2)