Industrial Byproduct (Often Confused With Igneous Rocks Or Meteorites)

Hematite

Iron(III) oxide (Fe2O3)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Banded Gneiss (with Quartz Vein)

Gneiss (Metamorphic rock of varying mineralogy)

Quartz (Milky or Cloudy variety)

Silicon Dioxide (SiO2)

Greenstone (Prase / Nephrite / Serpentine mix)

Metamorphosed ultramafic rock / greenstone facies

Yellow Quartz (Citrine/Yellow Jasper mix)

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Rose Quartz

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

Native Copper

Native Copper (Cu)

Pyrite

Iron Sulfide (FeS2)

Smoky Quartz (with complementary stones in jewelry setting)

Smoky Quartz (Silicon Dioxide - SiO2)

Carnelian Agate

Silicon Dioxide (SiO2) with iron oxide impurities

Granite

Granite (composed of Quartz, Feldspar, and Mica)

Quartz (Iron-stained Quartz Pebble)

Silicon Dioxide (SiO2)

Kyanite (Green and Blue varieties)

Kyanite (Al2SiO5)

Sodalite in Quartz

Na8(Al6Si6O24)Cl2 (Sodalite) / SiO2 (Quartz)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Shale or Siltstone

Sedimentary Clastic Rock (Variable mineral composition including quartz and clay minerals)

Orange Calcite

Calcium Carbonate (CaCO3)

Quartzite

Quartzite (mostly SiO2)

Garnet Schist

Almandine Garnet-Mica Schist (X₃Y₂(SiO₄)₃)

Black Tourmaline (Schorl)

NaFe2+3Al6(BO3)3Si6O18(OH)4

Quartz (Granular Milky Quartz fragment)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Quartzite River Rock

Quartzite ($SiO_2$)

Diorite (Porphyritic) / Granite

Plutonic Igneous Rock (Granodiorite / Diorite)

Pyrite (Fool's Gold) Cube

Iron Sulfide (FeS2)

Clear Quartz (or Rock Crystal)

Quartz (SiO₂)

Sodalite

Na8(Al6Si6O24)Cl2 (Sodium Aluminum Silicate Chloride)

Gneiss

Gneissic Metamorphic Rock

Granite Pebble

Intrusive Igneous Rock

Jasper-Agate

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Smoky Quartz with Feldspar

SiO2 (Quartz) with KAlSi3O8 (Feldspar)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Smoky Quartz

Silicon Dioxide (SiO2)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)

River Cobble (Basalt or Sandstone)

Weathered Basalt or Fine-Grained Sandstone

Chalcedony (Agate/Quartz)

Silicon Dioxide (SiO2)

Greenish rock with white veins, possibly epidote or chlorite bearing rock with quartz/calcite veins

Altered mafic rock or Epidosite

Sandstone (Micaceous Sandstone)

Arenite (SiO2 with KAl2(AlSi3O10)(OH)2 inclusions)