Sedimentary And Igneous (Mixed)

Diabase (Greenstone)

Diabase (also known as Dolerite)

Stardust (Micrometeorite)

Chondrite / Micrometeorite (Extraterrestrial Silicate)

Porphyritic Rhyolite

Porphyritic Rhyolite

Granite

Phaneritic Granitoid (Primary minerals: Quartz SiO2, Feldspar KAlSi3O8, and Biotite/Mica)

Pink Granite

Granite (Phaneritic intrusive rock rich in K-feldspar)

Amygdaloidal Rhyolite

Amygdaloidal Rhyolite (Felsic volcanic rock)

Obsidian

Volcanic Glass (predominantly SiO2)

Obsidian

Obsidian (Volcanic glass), 70-75% SiO2

Granite

Granite (Mainly Quartz, Feldspar, and Mica)

Granite

Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

Snowflake Obsidian

Volcanic glass with Cristobalite inclusions (70–75% SiO2)

Granite

Granite (Mainly Quartz, Feldspar, and Mica)

Obsidian / Volcanic Glass

Obsidian (principally SiO2, usually 70% or more)

Granite

Granite (Phaneritic igneous rock)

Granite

Phaneritic intrusive felsic igneous rock

Granite

Plutonic Igneous Rock (composed of Quartz, Feldspar, and Mica)

Granodiorite

Granodiorite (Phaneritic intrusive igneous rock containing Plagioclase, Quartz, and Biotite/Amphibole)

Obsidian (Apache Tear)

Amorphous Volcanic Glass (SiO2 + impurities)

Basalt (River Pebble)

Basalt (Mafic Extrusive Igneous Rock)

Orthoclase (Potassium) Feldspar in Quartz

KAlSi3O8 (Potassium Aluminum Silicate)

Granite with Quartz Vein

Phaneritic Felsic Igneous Rock (composed of Quartz [SiO2], Feldspar, and Mica)

Granitic Pegmatite with Biotite

Pegmatitic Granite (contains KAlSi3O8, SiO2, K(Mg,Fe)3AlSi3O10(OH)2)

Granitic Pegmatite with Schorl

Granitic Pegmatite (Schorl: NaFe3Al6(Si6O18)(BO3)3(OH)3OH)

Granite

Granite (Phaneritic intrusive igneous rock) - Composition: SiO2, Al2O3, K2O, Na2O

Granite

Phaneritic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

Granite

Granite (Felsic Plutonic Rock)

Mahogany Obsidian

Volcanic glass (SiO2 + Fe2O3)

Obsidian (Black)

Obsidian (approx. 70–75% SiO2)

Granite (Pink/Potassium-rich)

Phaneritic Plutonic Felsic Igneous Rock (primarily SiO2 with KAlSi3O8)

Obsidian (Black Obsidian)

Obsidian (Volcanic Glass)

Pegmatite

Granitic Pegmatite

Granite

Phaneritic plutonic rock (composed mainly of SiO2, Al2O3, K2O, and Na2O)

Spinel

Magnesium Aluminum Oxide (MgAl2O4)

Sodalite-rich Syenite (Sunset Sodalite)

Sodalite-Syenite (Na8[Al6Si6O24]Cl2 with KAlSi3O8)

Milky Quartz

Silicon Dioxide (SiO2)

Amethyst

Silicon Dioxide (SiO2) with trace Iron (Fe3+)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(F,OH)2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Amethyst (Tumbled)

Silicon Dioxide (SiO2 with iron impurities)

Almandine Garnet

Iron aluminum silicate (Fe3Al2(SiO4)3)