Organic Gemstone (Often Associated With Sedimentary Sequences)

Chert / Flint

Cryptocrystalline Quartz (SiO2)

Chert (Yellow/Brown Jasper)

Silicon Dioxide (SiO2)

Chert (often referred to as Flint or Jasper)

Chalcedony (SiO2) - Silicon Dioxide

Carnelian

Carnelian (Silicon Dioxide: SiO2)

Yellow Jasper (Mookaite style)

Silicon Dioxide (SiO2) with Goethite/Hematite inclusions

Pyrite in Shaly Matrix

Iron Sulfide (FeS2)

Jasper

Jasper (Silica-rich microcrystalline Quartz, SiO2 with Fe2O3 impurities)

Schist (Graphite or Mica rich)

Crystalline Schist (often containing Muscovite, Biotite, or Graphite)

Chert (with Limestone matrix)

Chert (Silica: SiO2)

Chert (Nodule)

Chert (Microcrystalline Quartz, SiO2)

Chert (and/or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (often called Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Limestone (specifically Bituminous or Carbonaceous Limestone)

Calcium Carbonate (CaCO3) with Organic Impurities

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Turquoise

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

Amber

Succinite (a fossilized organic resin)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Rhodonite

Rhodonite (Mn,Fe,Mg,Ca)SiO3

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Chert (specifically Jasper or Flint variety)

Cryptocrystalline Quartz (SiO2)

Honey Calcite

Calcite (Calcium Carbonate, CaCO3)

Rhodonite

Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3

Amethyst with Marcasite accents

Amethyst (Silicon Dioxide SiO2) and Marcasite (Iron Sulfide FeS2)

Chert (Arrowhead/Artifact Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (often called Flint)

Chert (Silicon Dioxide, SiO2)

Amber

Resinite / Fossilized Tree Resin

Native Gold (in earring form)

Gold (Au)

Turquoise with Pyrite

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O] with Iron Pyrite (FeS2)

Moss Agate

Silicon Dioxide (SiO2) with inclusions

Chert

Chert (microcrystalline quartz, SiO2)

Chert (Nodular or Massive Variety)

Cryptocrystalline Quartz (SiO2)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Fuchsite (Chrome Mica)

K(Al,Cr)2(AlSi3O10)(OH)2

Carnelian

Carnelian (a variety of Chalcedony, SiO₂)

Pink Coral

Corallium rubrum (Calcium Carbonate, CaCO3)

Black Opal

Amorphous Hydrated Silica (SiO2·nH2O)

Rhodonite

Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)

Fluorite Bracelet (light green beads) and possibly Lavender Jadeite (purple bead)

Fluorite: CaF₂ (Calcium Fluoride); Jadeite: NaAlSi₂O₆ (Sodium Aluminum Silicate)

Milky Quartz with Inclusions

Quartz (Silicon Dioxide, SiO2)

Rhodonite

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

Chert (specifically Jasper or Flint type)

Microcrystalline Quartz (SiO2)