Igneous

Labradorite (a variety of Feldspar)

Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)

Basalt

Basalt (Mafic volcanic rock)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Natural Gemstone Cabochons (Ruby, Moonstone, Emerald, Citrine)

Ruby (Al2O3:Cr), Moonstone (KAlSi3O8), Emerald (Be3Al2(SiO3)6:Cr), Citrine (SiO2)

Porphyry (likely Porphyritic Andesite or Basalt)

Porphyritic Igneous Rock

Basalt

Mafic Igneous Basalt

Basalt

Mafic Igneous Rock

Basalt

Mafic Igneous Rock

Basalt

Mafic Igneous Rock

Basalt

Mafic Igneous Rock

Basalt River Stone

Basaltic Igneous Rock

Granite

Phaneritic plutonic rock (SiO2 range 65-75%)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Epidote

Epidote Group (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Dalmation Stone

Peralkaline Rock (SiO2 with Arfvedsonite)

Milky Quartz

Silicon Dioxide (SiO2)

Granite

Granite (Mainly Quartz SiO2 and Feldspar KAlSi3O8)

Mahogany Obsidian

Volcanic Glass with Hematite or Magnetite inclusions (SiO2 + Fe2O3)

Granite

Phaneritic Felsic Intrusive Rock

Granite

Granite (a plutonic rock)

Aquamarine

Beryl (Be3Al2Si6O18 with Fe2+ impurities)

Hypersthene

Hypersthene ((Mg,Fe)SiO₃)

Quartz in Basalt (Xenocryst)

Silicon Dioxide (SiO2) in Mafic Igneous Volcanic Rock

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Granite Pebble

Granite (a plutonic igneous rock composed primarily of quartz, feldspar, and mica/amphibole)

Dalmatian Stone (often misnamed Dalmatian Jasper)

Aplite (with hornblende/arfvedsonite inclusions)

Granite

Granite (Phaneritic Igneous Rock)

White Quartz (Milky Quartz)

Quartz (Silicon Dioxide - SiO2)

Olivine in Basalt matrix

Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)

Amygdaloidal Basalt

Vesicular-Amygdaloidal Basalt (Mafic Extrusive)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Yellow Quartz (Citrine/Yellow Jasper mix)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz on Matrix

Silicon Dioxide (SiO2)