Granite

Rhyolite

Rhyolite

Granite Pebble

Granitoid (Quartz-Feldspar dominant rock)

Granodiorite

Granodiorite

Amazonite

Microcline (variety Amazonite), K(AlSi3O8)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Unakite (Epidote-Granite)

Unakite (altered granite containing epidote, orthoclase, and quartz)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Unakite

Epidotized Granite (composition: K-feldspar, Epidote, and Quartz)

Citrine

Silicon Dioxide (SiO2)

Potassium Feldspar and Quartz

KAlSi3O8 (Potassium Feldspar) and SiO2 (Quartz)

Educational Geologic Collection

Mixed Mineral and Rock Collection (Various compositions)

Mixed collection of minerals and rocks (Jasper, Carnelian, Granite, and Quartz)

Silicon Dioxide (SiO2) with varying impurities for silicates and igneous aggregates

Unakite

Epidotized Granite (SiO2, KAlSi3O8, Ca2(Al, Fe)3(SiO4)3(OH))

Biotite or Phlogopite Mica

K(Mg,Fe)3(AlSi3O10)(F,OH)2

Unakite or Epidote-Rich Granite

Unakite (Epidote, Orthoclase, and Quartz)

Black Tourmaline (Schorl)

Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3(OH)4)

Granite Pebble

Granite (Phaneritic intrusive igneous rock)

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Bauxite

Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))

Quartz (Gray or Smoky variety)

Silicon Dioxide (SiO2)

Arfvedsonite in Quartz

Arfvedsonite [Na3(Fe2+4Fe3+)Si8O22(OH)2] often hosted in Quartz or Feldspar

Milky Quartz

Silicon Dioxide (SiO2)

Rhyolite

Rhyolite (Extrusive Igneous Rock)

Purple Lepidolite with Quartz

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Gneiss

Gneiss (High-grade metamorphic rock)

Quartz (Citrine or Iron-Stained)

Silicon Dioxide (SiO2)

Bauxite

Bauxite (Al2O3·2H2O mixed with iron oxides)

Pink Granite

Granite (Phaneritic igneous rock rich in Alkali Feldspar and Quartz)

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-feldspar, Quartz, and Biotite)

Pink Granite

Granite (High K-Feldspar variety)

Pink Granite

Granite (Phaneritic intrusive igneous rock dominated by Quartz and K-Feldspar)

Pink Granite

Granite (Phaneritic Igneous Rock, primarily SiO2)

Pink Granite

Phaneritic Plutonic Rock (Granite with K-Feldspar)

Diorite

Diorite (Intermediate intrusive igneous rock)

Granite Pebble

Granite (Phaneritic Igneous Rock)

Granite Cobble

Granite (Phaneritic Igneous Rock)

Gabbro

Gabbro

Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

Pink Granite (River Pebble)

Felsic Intrusive Igneous Rock

Pink Granite

Phaneritic plutonic rock (Granite)

Granite (Pink Orthoclase variety)

Phaneritic intrusive igneous rock (Quartz, Orthoclase, Plagioclase, and Mica)

Biotite Granite

Phaneritic Felsic Igneous Rock