Non Geological

Pyrite

Iron Sulfide (FeS2)

Unakite

Altered Granite (Granitic Metamorphic Rock)

Pyrite

Iron Sulfide (FeS2)

Flint

SiO2 (Cryptocrystalline Quartz)

Quartz

Silicon Dioxide (SiO2)

Quartz Cluster

Silicon Dioxide (SiO2)

Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2)

Pyrite (Tumbled)

Iron Disulfide (FeS2)

Bentonite Clay

Montmorillonite silicate ((Na,Ca)0.33(Al,Mg)2Si4O10(OH)2·nH2O)

Pyrite in Matrix

Iron Sulfide (FeS2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Milky / Clear Quartz Fragment)

Silicon Dioxide (SiO2)

Carnelian Agate

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartz pebble

SiO2

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Smoky/Milky Variety)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Black Onyx

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Colorless Quartz (Rhinestone)

Silicon Dioxide (SiO2)

Silver (S925)

Native Silver (Ag)

Rose Quartz

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

Lapis Lazuli

Lazurite-dominant metamorphic rock, Na8[Al6Si6O24]n(S,Cl,SO4,OH)2

Pyrite

Iron Disulfide (FeS2)

Druzy Quartz

Silicon Dioxide (SiO2)

Schorl (Black Tourmaline) in Quartz/Feldspar Matrix

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

Rose Quartz

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

Granite

Granite (composed of Quartz, Feldspar, and Mica)

Unakite

Epidotized Granite

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Black Onyx

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Gold Nugget

Native Gold (Au)

Biotite Mica

Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)

Gold Nugget

Native Gold (Au)

Milky Quartz

Silicon Dioxide (SiO2)

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

Unakite

Epidotized Granite

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Banded Chert

Silicon Dioxide (SiO2)