Igneous And Metamorphic

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

Epidote in Quartz (Unakite-like specimen)

Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)) in Quartz (SiO2)

Garnet Schist

Almandine-mica schist

Soapstone (Talc-Schist)

Steatite (composed primarily of Talc: Mg3Si4O10(OH)2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Quartz Mica Schist

Mica-Quartz Schist (Chemical: SiO2 + KAl2(AlSi3O10)(OH)2)

Quartzite

Quartzite (SiO2)

Mica Schist (with Muscovite)

Muscovite/Quartz Schist (KAl2(AlSi3O10)(OH)2)

River Rock (likely Quartzite or Chert)

Quartzite (primarily SiO2)

Phyllite

Phyllite (Foliated metamorphic rock)

Quartz

Quartz (SiO2)

Jadeite

NaAlSi2O6 (Sodium Aluminum Silicate)

Yellow Aventurine

Silicon Dioxide (SiO2) with inclusions

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite

Quartzite (SiO2)

Mica Schist

Mica Schist (Composition: Muscovite, Biotite, Quartz, Feldspar)

Quartzite Pebble

Metamorphic rock predominantly composed of Quartz (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Kyanite in Quartz

Kyanite (Al2SiO5) with Quartz (SiO2) matrix

Quartzite

Quartzite (primarily SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Schist

Mica Schist

Milky Quartz (with Chlorite/Mineral Inclusions)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

Muscovite Schist with Quartz

KAl2(AlSi3O10)(OH)2 in Schistose matrix

Dark-colored Igneous Rock (likely Basalt or Diabase)

Basalt (extrusive igneous) or Diabase (intrusive igneous)

Staurolite (Fairy Cross)

Staurolite (Fe2+2Al9Si4O23(OH))

Muscovite Schist with Quartz

Mica Schist (KAl2(AlSi3O10)(OH)2)

Rhodonite (in matrix)

Rhodonite (Mn,Fe,Mg,Ca)SiO3

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Quartz Vein in Metamorphic Rock

Silicon Dioxide (SiO2) within Metasedimentary host

Garnet Schist

Garnet-bearing Mica Schist (variety of compositions, often Al2SiO5 with X3Y2(SiO4)3)

Rhodonite

Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3

Pyrite

Pyrite (Iron Disulfide), FeS2

Calcite

Calcite (Mineral, Calcium Carbonate - CaCO3)

Quartz

Silicon dioxide (SiO₂)

Amethyst

SiO2 (Silicon Dioxide) - a variety of Quartz

Rutilated Quartz

SiO2 with TiO2 inclusions (Rutile)

Amazonite

KAlSi3O8 (Potassium Feldspar, variety of Microcline)