Sedimentary (Artificial)

Chalcedony (Moonstone-like Agate)

Silicon Dioxide (SiO₂)

Kyanite in Quartz

Kyanite (Al2SiO5) with Quartz (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Green Kyanite

Kyanite (Al2SiO5)

Yellow Aventurine

Silicon Dioxide with inclusions (SiO2 + Muscovite/Fuchsite)

Quartz (Milky/Crystal Variety)

Silicon Dioxide (SiO2)

Chert (Arrowhead variety)

Chert (SiO2)

Blue Kyanite in Quartz

Kyanite (Al2SiO5)

Fluorite

Calcium Fluoride (CaF2)

Gneiss

Gneiss

Travertine

Calcareous Tufa / Travertine (CaCO3)

Chalcedony / Agate

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Caribbean Calcite

Calcium Carbonate (CaCO3) with Aragonite (CaCO3)

Quartz / Milky Quartz

Silicon Dioxide (SiO2)

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Blue Chalcedony

Silicon Dioxide (SiO2)

Agate with Druzy Quartz

Silicon Dioxide (SiO2)

Hematite (Iron Ore)

Hematite (alpha-Fe2O3)

Chert (Flint)

Chert (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Aragonite (Banded Calcite / 'Mexican Onyx')

Aragonite (Calcium Carbonate - CaCO3)

Limonite

Limonite (FeOO·nH2O)

Zoisite with Ruby (Anyolite)

Zoisite – Ca2Al3(SiO4)3(OH) with inclusions of Ruby (Al2O3:Cr)

Selenite (Satin Spar)

Gypsum (CaSO4·2H2O)

Orange Calcite

Calcium Carbonate (CaCO3)

Red Jasper (Brecciated Jasper)

SiO2 (Silicon Dioxide) with Ferric Iron inclusions

Clear Quartz

Silicon Dioxide (SiO2)

Botryoidal Chalcedony

Silicon Dioxide (SiO2)

Rhodochrosite

Manganese carbonate (MnCO3)

Satin Spar Selenite

Calcium Sulfate Dihydrate (CaSO4·2H2O)

Muscovite Schist with Quartz

KAl2(AlSi3O10)(OH)2 in Schistose matrix

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Fossilized Echinoid (Sea Urchin)

Echinoidea (Class), often found as calcitic fossils

Chalcedony (Agate/Chert)

Silicon Dioxide (SiO2)

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)