Organic Gemstone (Sedimentary Associations)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Industrial slag (iron/copper smelting slag)

Multiphase vitreous metallurgical slag; commonly iron-silicate glass with metal-oxide and metallic inclusions

Amethyst (Super Seven / Melody's Stone Variety)

Silicon Dioxide (SiO2) with trace impurities including Iron

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Granite

Felsic intrusive igneous rock

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Amber

Succinite

Chert

Microcrystalline Quartz (SiO2)

Prehnite

Ca2Al(AlSi3O10)(OH)2

Gemstones (Emerald and Yellow Topaz or Citrine)

Beryl (Be3Al2Si6O18) and Quartz (SiO2) or Topaz (Al2SiO4(F,OH)2)

Epidote (Greenstone)

Calcium aluminum iron silicate hydroxide Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)

Likely weathered quartz-rich stone

Indeterminate; possibly quartz-bearing granite or milky quartz

Amber

Succinite (C10H16O)

Picture Jasper

SiO2

Chert (Flint)

Silicon Dioxide (SiO2)

Amber and Citrine Quartz

Succinite (Amber) and Silicon Dioxide (SiO2 / Citrine)

Jasper

Microcrystalline Quartz (SiO2)

Mixed Mineral Collection (with Quartz, Beryl, and host rock)

Silicon Dioxide (Quartz), Be3Al2Si6O18 (Beryl), and associated Schist/Pegmatite

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Amber (Rough Baltics/Beach Specimen)

Succinicum (Organic Gemstone - Fossilized Resin)

Turquoise

Hydrous phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)

Flint

SiO2 (Cryptocrystalline Quartz / Chert)

River Jasper (Chert/Chalcedony)

Silicon Dioxide (SiO2) with iron oxide impurities

Chert (Basanite / Jasperoid)

Microcrystalline Quartz (SiO2)

Nephrite Jade

Tremolite-Actinolite solid solution Ca2(Mg,Fe)5Si8O22(OH)2

Chert (Flint)

Silicon Dioxide (SiO2)

Red Jasper with Chalcedony Banding

Microcrystalline Quartz (SiO2) with Hematite inclusions

Amber

Succinate (Organic Fossilized Resin)

Chert / Flint

Silicon dioxide (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Pink Opal

Hydrated silica (SiO2 "n H2O)

Amber

Fossilized Tree Resin

Morganite

Beryl (Be3Al2Si6O18 with Mn)

Amethyst quartz crystal

Quartz, SiO₂, purple variety (amethyst)

Pyrite in Matrix

Iron Sulfide (FeS2)

Amber (possibly a small polished amber cabochon)

Fossilized tree resin; amber is an organic gemstone, not a mineral

Sodalite

Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)

Malachite

Copper(II) carbonate hydroxide [Cu2CO3(OH)2]

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Epidote

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Flower Agate

Chalcedony (Silicon Dioxide) with Plume Inclusions, SiO2