Metamorphic Rock (Composed Of Multiple Minerals)

Massive Quartz (Milky or Gray)

Silicon Dioxide (SiO2)

Iolite-bearing Gneiss (Cordierite)

Cordierite (Mg2Al4Si5O18) in Gneiss matrix

Quartz (Water-worn pebble)

Silicon Dioxide (SiO2)

Marble (Sculculpted)

Metamorphosed Limestone (primarily CaCO3)

Mica Schist

Mica Schist

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Orange Quartzite / Carnelian Agate

Silicon Dioxide (SiO2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Quartz / Rock Crystal

Silicon Dioxide (SiO2)

Crushed Granite Gravel

Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase Feldspar)

Granite

Phaneritic Felsic Igneous Rock (composed of quartz, feldspar, and mica)

Pink Stained Rock (Likely Quartzite or Sandstone with Iron Oxide Staining)

Quartzite (metamorphic) or Sandstone (sedimentary); coloration likely due to hematite or other iron oxides.

Clear Quartz

Silicon Dioxide (SiO2)

Granite

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

Yellow Calcite

Calcium Carbonate (CaCO3)

Black Kyanite

Kyanite (Al2SiO5) with carbonaceous inclusions

Granite (with alteration)

Granite (Felsic intrusive igneous rock)

Black Sapphire

Corundum (Al2O3 with iron and titanium impurities)

Specular Hematite

Hematite (Fe2O3)

Pearl and Garnet Glass

Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass

Quartz

Silicon Dioxide (SiO2)

Diamond in Kimberlite

Kimberlite host rock with C (Carbon) inclusion

Milky Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Pink Granite

Phaneritic plutonic igneous rock (Alkali-feldspar granite)

Gold-bearing Quartz with Iron Oxides

Quartz (SiO2) with Limonite/Goethite (FeO(OH)) and Pyrite (FeS2)

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)

Greenstone / Greenstone Pebble

Greenschist (metamorphosed basalt or gabbro)

Amygdaloidal Basalt with Secondary Minerals

Basalt containing secondary mineralization (likely Chlorite, Celadonite, or Zeolites)

Banded Iron Formation (BIF) with Quartz

Banded Iron Formation, often composed of alternating layers of hematite (Fe2O3) or magnetite (Fe3O4) and chert (microcrystalline quartz, SiO2)

Dendritic Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides

Quartzite with Quartz Geode / Vug

Crystalline Silicon Dioxide (SiO2) in Metamorphic Host

Peacock Ore (Bornite or Chalcopyrite treated with acid)

Bornite (Cu5FeS4) or Acid-washed Chalcopyrite (CuFeS2)

Milky Quartz (with Iron Oxide staining)

Quartz (Silicon Dioxide - SiO2)

Granodiorite

Granodiorite (containing Plagioclase, Quartz, and K-feldspar)

Jadeite Jade

NaAlSi2O6 (Sodium Aluminum Silicate)

Pearl

Aragonite / Calcium Carbonate (CaCO3)

Milk Quartz (White) and Yellow Aventurine (Yellow)

Silicon Dioxide (SiO2)

Ruby (Pinkish-Red)

Corundum (Al2O3 with Chromium trace)

Garnet Schist

Almandine-Mica Schist

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)