Metamorphic Or Igneous

Nephrite Jade (River Pebble)

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Sapphire

Corundum (Al₂O₃) with trace elements causing color variations.

Pink Granite (Gneissic transition)

Pink Biotite Granite

Moonstone

Adularia (Potassium Aluminum Silicate, KAlSi3O8)

Amethyst

Amethyst (variety of Quartz, SiO2)

Quartz Sand Grain

Silicon Dioxide (SiO2)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Olivine (often within Peridotite)

Magnesium iron silicate, (Mg,Fe)2SiO4

Yellow Quartz (Citrine Quartz Pebble)

Silicon Dioxide (SiO2)

Quartz (Milky/Vein Quartz)

Silicon Dioxide (SiO2)

Rough Rose Quartz

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

Yellow Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Hypersthene

(Mg,Fe)SiO3 - Enstatite-Ferrosilite series

Ruby (in costume jewelry context)

Corundum (Al2O3) with Chromium impurities

Yellow Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Quartz Pebble (Iron-Stained)

Quartz (Silicon Dioxide - SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Milky Quartz Mushroom Carving

Quartz (Silicon Dioxide, SiO2)

Quartz / Vein Quartz

Quartz (Silicon Dioxide, SiO2)

Blue Sapphire

Corundum (Al2O3)

Smoky Quartz (with possible Feldspar inclusions)

Silicon Dioxide (SiO2)

Granite / Gneiss Complex

Felsic Plutonic Rock (Granite) or High-grade Metamorphic Rock (Gneiss)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Garnet (likely Almandine)

Almandine (Fe3Al2(SiO4)3)

Pyrite (on Quartz/Host Rock)

Iron Sulfide (FeS₂)

Gold Ore in Quartz

Auriferous Quartz (Gold: Au; Quartz: SiO2)

Quartz (Milky or Clear Quartz fragment)

Silicon Dioxide (SiO2)

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Magnetite (potentially as a Lodestone or within Ironstone)

Magnetite (Fe3O4)

Quartz

SiO₂ (Silicon Dioxide)

Clear Quartz (or Rock Crystal)

Quartz (SiO₂ - Silicon Dioxide)

Gneiss

Gneiss (High-grade metamorphic rock composed primarily of Quartz, Feldspar, and various Micas)

Serpentine with Quartz Vein

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4 with SiO2 veins

Gneiss

Gneiss (High-grade regional metamorphic rock)

Gneiss (specifically a Banded Gneiss pebble)

Gneiss (High-grade Regional Metamorphic Rock)

Quartz Pebble

Silicon Dioxide (SiO2)

Chrysocolla

Hydrated copper phyllosilicate, Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Milky/Cloudy Variety)

Silicon Dioxide (SiO2)