Non Geological

Jadeite

Jadeite (NaAlSi2O6)

metamorphic

Carnelian Agate

Silicon Dioxide (SiO2) with high Iron Oxide impurities

Granite

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)

Green Calcite

Calcium Carbonate (CaCO3)

Clear Quartz Sphere

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble (often referred to as 'Sea Glass' or 'River Stone' when worn smooth)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Granite

Phaneritic Igneous Rock (Granite)

Chert (Common Chert)

Cryptocrystalline Quartz (SiO2)

Milky Quartz with Iron Staining and Matrix

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Greywacke

Greywacke sandstone

Agate (or Chalcedony)

Silicon Dioxide (SiO2)

Quartz (specifically Milky or Rose Quartz)

Silicon Dioxide (SiO2)

Rhodonite

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

Milky Quartz

Silicon Dioxide (SiO2)

Aluminum Slag

Anthropogenic Aluminum (Al)

Clear Quartz

Silicon Dioxide (SiO2)

Freshwater Pearl

Aragonite / Biogenic Calcium Carbonate (CaCO3)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Iron-Stained or Milky Quartz)

Silicon Dioxide (SiO2)

Granite

Pyrite (Fool's Gold) Ore

Iron Disulfide (FeS2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Mineral

Red Quartzite

Quartzite (primarily SiO2)

metamorphic

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese

Pyrite

Iron Sulfide (FeS2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Limonite (Iron Ore)

Limonite (Hydrated iron oxide - FeO(OH)·nH2O)

Stichtite in Serpentine (Atlantisite)

Mg6Cr2CO3(OH)16·4H2O (Stichtite) within Mg3Si2O5(OH)4 (Serpentine)

Metamorphic

Quartz (Milky and Bull Quartz)

Silicon Dioxide (SiO2)

Chert (Yellow Jasper)

Silicon Dioxide (SiO2)

Greenstone

Greenschist / Greenstone (Chlorite-Epidote facies)

metamorphic

Clear Quartz (beads in a bracelet)

Quartz (SiO2)

Mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Pumice

Vesicular Rhyolite or Andesite (Amorphous volcanic glass)

Sand Dollar Fossil

Echinoidea (Clypeasteroida)