Sedimentary Or Igneous (Host Environment)

Quartz (Milky/Smoky Crystal fragment)

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Quartz (specifically Milky/White Quartz)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Crystalline Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Quartz (Milky/Rose variety)

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Clear Quartz

Silicon Dioxide (SiO2)

Chalcedony

Cryptocrystalline Quartz (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Red Sandstone

Arenite (predominantly SiO2 with Fe2O3)

Petrified Wood

Silicified wood (primarily Silicon Dioxide, SiO2)

Sandstone (Muddy/Silty Variety)

Arenite with high silt/clay content (clastic sedimentary rock)

Quartz / Limestone Gravel

SiO2 (Silicon Dioxide) and CaCO3 (Calcium Carbonate)

Sandstone (specifically Cross-bedded Sandstone)

Arenite (composed primarily of SiO2)

Herkimer Diamond

Quartz (Silicon Dioxide) - SiO2

Rose Quartz

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

Arfvedsonite in Quartz

Arfvedsonite [Na3(Fe2+4Fe3+)Si8O22(OH)2] often hosted in Quartz or Feldspar

Quartz vein in metamorphic rock

Crystalline Silicon Dioxide (SiO2) in Host Rock

Petrified Wood

Silicified Wood (SiO2)

Slate with Red Sandstone Landscaping Rock

Foliated Pelitic Metamorphic Rock (Slate) and Ferruginous Sandstone

Botryoidal Chalcedony (Agate/Desert Rose Chalcedony)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Chert (Smooth River Pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement

Granite (weathered pebble)

Granite (plutonic igneous rock)

Turquoise

Hydrate phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O

Native Copper within Host Rock

Native Copper (Cu)

Milk Quartz (River Pebble)

Quartz (Silicon Dioxide, SiO2)

Quartz Crystal

Quartz (SiO₂)

Jasper (specifically Bloodstone or Heliotrope variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartz (Milky/Vein Quartz)

Silicon Dioxide (SiO2)

Arsenopyrite in Quartz Matrix

Arsenopyrite (FeAsS) with Quartz (SiO2)

Quartz (Milky/Chalcedony variety)

Silicon Dioxide (SiO2)

Jasper with Quartz inclusions

Silicon Dioxide (SiO2) - Microcrystalline Chalcedony

Hematite

Iron(III) oxide (Fe2O3)

Yellow Jasper (within host rock)

Silicon Dioxide (SiO2) with iron hydroxides (Goethite)

Quartz Vein in Mica Schist

Quartz (SiO2) with Muscovite/Biotite Schist