Igneous And Metamorphic Derivative (Weathered)

Chert (Jasper variation)

Microcrystalline Quartz (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Chert Pebble with Quartz Veining

Microcrystalline Quartz (SiO2)

Quartz (chalcedony variety) or Limestone with Quartz Veins

SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)

Sandstone (Ferruginous)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)

Sandstone (Quartzite-rich Cobble)

Clastic sedimentary rock (primarily SiO2)

Gneiss

Metamorphic rock of high-grade regional metamorphism

Mixed Gemstone Beaded Jewelry

Various minerals (e.g., Quartz varieties like Rose Quartz, Amethyst; Peridot; Garnet; etc.)

Epidote with Unakite characteristics

{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Quartz (Milky/Iron-stained)

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (Metamorphic Rock)

Gneiss

Gneiss

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Red Garnet (Pyrope or Almandine)

Magnesium aluminum silicate (Mg3Al2(SiO4)3) or Iron aluminum silicate (Fe3Al2(SiO4)3)

Granite

Granite (felsic intrusive igneous rock)

Greenschist (Greenstone)

Chlorite Schist / Greenschist Facies Rock

Hematite (Iron Ore)

Hematite (alpha-Fe2O3)

Chert (vuggy/nodular)

Microcrystalline Quartz (SiO2)

Quartz (Flesh-colored or Rose Quartz variety)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Chert (often called Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Gold-bearing Quartz with Iron Oxides

Quartz (SiO2) with Limonite/Goethite (FeO(OH)) and Pyrite (FeS2)

Chert (Gravel Bit)

Microcrystalline silica (SiO2)

Chert (Flint variety)

Chert (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Pink Chalcedony (Agate/Jasper blend)

Silicon Dioxide (SiO₂)

Granite Gneiss

Gneiss (high-grade metamorphic rock)

Greenschist (containing Epidote and Quartz)

Greenschist (Epidote-Chlorite-Actinolite Schist)

Mica-rich Schist fragment

Mica Schist

Green Aventurine

Aventurine (a variety of Quartz, SiO2)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Garnet (Almandine)

Almandine (Fe3Al2(SiO4)3)

Orthoclase Feldspar

Potassium aluminum silicate (KAlSi3O8)

Rough Quartz (or Quartzite pebble)

Silicon Dioxide (SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Sandstone (with Lichen)

Arenite (primarily SiO2)

Chert (Chalky/Gray Variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Unakite

Unakite (Epidote-Feldspar rock)

Basalt

Vesicular Basalt (Mafic volcanic rock)

Red Ochre (Hematite-rich Clay)

Limonitic/Hematitic Claystone (Fe2O3 with clay minerals)