Mineral In Metamorphic Rock

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(OH)2

Schist (Biotite/Mica Schist)

Medium-grade regional metamorphic rock (rich in Phyllosilicates)

Orthoclase Feldspar

Potassium Feldspar (KAlSi3O8)

Yellow Quartzite Pebble

Quartzite (primarily Silicon Dioxide - SiO2)

River Quartz Pitting/Cobble

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Diamond Drill Core (Greenschist and Quartzite)

Chlorite Schist / Meta-quartzite (Metamorphic Rock Core Sample)

Marble

Recrystallized Calcite Rock (CaCO3)

Quartzite with Garnet

Garnetiferous Quartzite (SiO2 + X3Y2(SiO4)3)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

River Rock (likely Quartzite or Chert)

Quartzite (primarily SiO2)

Tiger's Eye

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

Yellow Quartzite (River Pebble)

Quartzite (SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Rough Emerald/Green Beryl

Beryl (Be3Al2(SiO3)6) with trace amounts of Chromium or Vanadium

White Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Banded Agate (specifically Eye Agate / Chalcedony)

Agate (Cryptocrystalline variety of Quartz, SiO2)

Banded Gneiss

Gneiss (quartz-feldspar-biotite metamorphic rock)

Quartz (Milky/Common)

Quartz (Silicon Dioxide, SiO2)

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Mica Schist

Muscovite/Biotite Schist

Quartzite

Quartzite (primarily SiO2)

Wishing Stone with Quartz Veins

Quartzite or Quartz-veined Metamorphic Rock (composed mainly of SiO2)

Yellow Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Green Aventurine

Quartz variety (SiO2 with inclusions)

White Jade / White Chalcedony

Nephrite Jade (Ca2(Mg,Fe)5Si8O22(OH)2) or Chalcedony (SiO2)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Schist

Mica Schist (primarily Muscovite [KAl2(AlSi3O10)(OH)2] or Biotite)

Gneiss Pebble

Gneiss

Quartz Pebble

Silicon Dioxide (SiO2)

Gneiss (Stream-worn Cobble)

Gneiss (Metamorphic rock composed primarily of Quartz, Feldspar, and Mica)

Quartz in Matrix (possibly with Biotite or Hornblende)

Quartz (Silicon Dioxide, SiO2) in Granitic Matrix

Quartzite River Rock with Dendrites

Metamorphosed Quartz-rich Sandstone with Manganese Oxide (MnO2) inclusions

Milky Quartz

Silicon Dioxide (SiO2)

Tiger's Eye (Unpolished)

Pseudomorph of Quartz after Crocidolite (SiO2)

Schist (Garnet-Mica Schist)

Garnet-Mica Schist (X-Y)3Z2(SiO4)3

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Gneiss (Granitic Gneiss)

Gneiss (from German Gneis, related to 'spark')

Mica Schist

Mica Schist (primarily Muscovite and Quartz)

Almandine Garnet in Schist Matrix

Almandine - Fe3Al2(SiO4)3

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)