Non Geological

Feldspar

Potassium Feldspar (KAlSi3O8)

Fairy Stone (Staurolite Twin)

Staurolite (Fe,Mg,Zn)2Al9Si4O22(OH)2

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Opaline Glass (Opalite)

Synthetic Silicon Dioxide Glass

Mineraloid (Man-made)

Sandstone

Arenite (primarily SiO2)

Quartz (Milky or Clear variety)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Mineral

Granite

Granite (Alkali-feldspar, Quartz, and Plagioclase composition)

Milky Quartz

Silicon Dioxide (SiO2)

Banded Calcite (Tumbled)

Calcium Carbonate (CaCO3)

Mineral

White Quartz

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron inclusions

Gold Ore

Native Gold in Quartz (Au)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Quartzite with Iron Mineral Banding

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) staining

Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Granite

Granite (Phaneritic Quartz-Feldspar intrusive rock)

Igneous

Granite

Granite (composed of Quartz, Feldspar, and Mica/Amphibole)

Amber

Succinite (C10H16O)

mineraloid

Biotite (Black Mica)

Biotite [K(Mg,Fe)3(AlSi3O10)(F,OH)2]

K2 Jasper (K2 Granite)

Azurite-in-Granite

Clear Quartz (or Rock Crystal)

Quartz (SiO₂)

Mineral

Petrified Wood

Silicified Wood (primarily SiO2)

Vesuvianite (Idocrase)

Ca19(Al, Mg, Fe)13(SiO4)10(Si2O7)4(OH, F, O)10

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Oolitic Chert

Ooidal Microcrystalline Quartz (SiO2)

Quartz Geode

Silicon Dioxide (SiO₂)

Spinifex Textured Komatiite

Komatiite (Mg-rich ultramafic volcanic rock)

Granite (Core Sample)

Phaneritic Felsic Igneous Rock (Granite)

Quartz Geode

Crystalline Silicon Dioxide (SiO2) within a nodule

Limonite (Iron Stone Concretion)

Limonite (Hydrous Iron Oxide) - FeO(OH)·nH2O

Gossan (Limonite/Goethite)

Hydrated iron oxides (primarily FeO(OH)·nH2O)

Copper-bearing Mica Schist

Mica Schist with Native Copper inclusions

Granite with Biotite and Quartz

Phaneritic Felsic Igneous Rock (composed of SiO2, KAlSi3O8, and K(Mg,Fe)3AlSi3O10(OH)2)

Moqui Marble (Iron-Oxide Concretion)

Iron Oxide Concretion (Fe2O3)

Petrified Wood

Silicified Wood (primarily SiO₂ - Silicon Dioxide)