Industrial Byproduct

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Serpentinite

Serpentinite (containing minerals of the Serpentine subgroup: Antigorite, Lizardite, and Chrysotile; formula (Mg,Fe)3Si2O5(OH)4)

Yooperlite

Fluorescent Sodalite-bearing Syenite

Quartzite

Quartzite (SiO2)

Peridot (Gem-quality Olivine)

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

Green Calcite

Calcium Carbonate (CaCO3)

Olivine (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Calcite Geode

Calcium Carbonate (CaCO3)

Almandine Garnet & Tumbled Citrine Quartz

Fe3Al2(SiO4)3 (Garnet) and SiO2 (Quartz)

Quartz with Mica inclusion

Silicon Dioxide (SiO2) with Muscovite/Biotite inclusions

Garnet Schist

Almandine Garnet Schist

Diamond in Kimberlite

Diamond (C in Kimberlite)

Desert Rose (Baryte/Gypsum Rosette)

Baryte (BaSO4) or Gypsum (CaSO4·2H2O)

Yellow Calcite

Calcium Carbonate (CaCO3)

Diamond

Diamond (pure Carbon, C)

Amethyst (Purple), Sulfur (Yellow), and Blue Apatite

SiO2 (Quartz), S (Native Sulfur), Ca5(PO4)3(F,Cl,OH) (Apatite Group)

Silicon Carbide (Carborundum)

Silicon Carbide (SiC) / Moissanite (natural)

Shale (Beach-worn)

Laminated Pelite (primarily clay minerals and quartz)

Diamond (in jewelry setting)

Diamond (Carbon, C)

Rough Gemstone Grains (Mixed Sapphires and Quartz)

Corundum (Al2O3) and Quartz (SiO2)

Peridot (Olivine)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Schist

Mica Schist (Quartz-Muscovite-Biotite Schist)

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Milky Quartz Pebble with Chert

Silicon Dioxide (SiO2)

Aquamarine

Beryl (Be3Al2Si6O18)

Native Copper

Native Copper (Cu)

Fluorite (Green)

Fluorite (Calcium Fluoride, CaF2)

Quartzite (Water-worn Pebble)

Metamorphosed Quartz Sandstone (SiO2)

Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Rose Quartz Beads

SiO2 (Silicon Dioxide with trace inclusions of Ti, Fe, or Mn)

Green Calcite

Calcium Carbonate (CaCO3)

Black Tourmaline in Quartz Matrix

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) with Quartz (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix

Quartz (Translucent/Rose variety)

Silicon Dioxide (SiO2)

Lake Superior Agate

Banded Chalcedony (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Golden Healer Quartz

Ferruginous Quartz (SiO2 with Fe2O3 inclusions)

Druzy Quartz (part of a Geode)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)