Metamorphic And Igneous

River Cobble (Quartzite)

Quartzite (SiO2)

Green Quartzite (Aventurine-like)

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Quartzite Pebble (Beach Stone)

Quartzite (primarily SiO2)

Quartzite (River Cobble)

Quartzite (Metamorphosed Quartz Sandstone, SiO2)

Quartzite (Ferruginous)

Recrystallized Quartz (SiO2) with Iron Oxide inclusions

Quartzite (or Milky Quartz pebble)

Quartzite (Metamorphosed Sandstone) / Silicon Dioxide (SiO2)

Blue Quartzite (Aventurine)

Silicon Dioxide (SiO2) with mineral inclusions

Unakite

Epidotized Granite

Mica Schist

Mica Schist (Complex Silicate Rock)

Quartzite

Quartzite (primarily SiO2)

Schist (Diamond Drill Core)

Mica Schist

Schist

Mica Schist (primarily Muscovite and Quartz)

Marble

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

Fuchsite Schist

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

Yellow Quartzite

Quartzite (primarily Silicon Dioxide - SiO2)

Green Aventurine

Aventurine Quartz (SiO2 with inclusions of Fuchsite)

Quartzite (River Cobble)

Quartzite (predominantly SiO2)

Quartzite River Rock

Quartzite (primarily SiO2)

Bornite

Bornite (Cu5FeS4)

Amazonite

Microcline (KAlSi3O8 variant)

Tiger's Eye

SiO2 (Silicon Dioxide) with fibrous crocidolite inclusions

Galena

Lead(II) sulfide (PbS)

Tiger's Eye

Pseudomorph of Quartz (SiO2) after Crocidolite

Green Calcite

Calcium Carbonate (CaCO3)

Green Aventurine

Silicon Dioxide (SiO2 with Fuchsite inclusions)

Emerald

Beryl (Be3Al2(SiO3)6) colored by Chromium and/or Vanadium

Rough Emerald Crystals

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Serpentinite

Serpentinite (group of hydrous magnesium iron phyllosilicates)

Serpentinite

Serpentine rock (Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4

Aquamarine

Beryl (Be3Al2Si6O18)

Mixed Gemstone Collection

SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)

Green Aventurine

Aventurine Quartz (SiO2 + Fuchsite mica)

Yellow Aventurine

Silicon Dioxide with inclusions (SiO2 + Muscovite/Fuchsite)

Blue Quartz (Dumortierite Quartz)

Silicon Dioxide with Aluminum Borosilicate (SiO2 + AlAl6BSi3O18)

Aventurine (Green Quartz)

Quartz with Fuchsite inclusions (SiO2 with K(Al,Cr)2(AlSi3O10)(OH)2)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Aquamarine

Beryl (Be3Al2Si6O18 with Fe2+ trace elements)

Slate River Stone

Foliated Metamorphic Rock (composed of illite, chlorite, and quartz)

River Pebble (Gneiss or Quartzite)

Metamorphic rock specimen (likely Gneiss or impure Quartzite)

Green Quartzite (River Stone)

Metamorphic Quartz (SiO2) with inclusions (typically Fuchsite or Chlorite)