Mineral Variant

Tumbled Obsidian (possibly Mahogany Obsidian variant)

Volcanic Glass (Amorphous Silicon Dioxide, SiO2)

Quartz (Clear Quartz and Rose Quartz variants)

Silicon Dioxide (SiO2)

Green Quartz (including Prase or Aventurine variants)

Silicon Dioxide (SiO2) with inclusions (likely Actinolite or Chlorite)

Yellow Chalcedony (common opal or chert variant)

Silicon Dioxide (SiO2)

Botryoidal Chalcedony (Desert Rose / Grape Agate variant)

Silicon Dioxide (SiO2)

Fancy Jasper (Ocean Jasper or River Jasper variant)

Silicon Dioxide with inclusions (SiO2)

Orbicular Jasper (Ocean Jasper or Poppy Jasper variant)

Silicon Dioxide (SiO2) with various inclusions

Yellow Jade (Nephrite or Quartzite variety)

Ca2(Mg,Fe)5Si8O22(OH)2 (Nephrite) / SiO2 (Quartzite variant)

Chert (Yellow or Ochre Jasper variant)

Microcrystalline Quartz (SiO2)

Chert (Light Grey / Flint variant)

Cryptocrystalline Quartz (SiO2)

Chert (Hagstone/Gasket Rock variant)

Chert (SiO2)

Chert (Lake Superior Agate variant)

Microcrystalline Quartz (SiO2)

Red Jasper (Heliotrope family variant)

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

Pumice

Highly vesicular volcanic glass (unnamed scientific variant: Rhyolitic/Andesitic Pumice)

Chert (specifically Jasper or Flint variant)

Microcrystalline Quartz (SiO2)

River Pebble (Gneiss or Quartzite variant)

Course-grained Metamorphic Rock (likely SiO2 dominant)

Chert (specifically Flint or Jasper variant)

Microcrystalline silica (SiO2)

Greenstone (Greywacke or Nephrite Jade variant)

Metamorphosed mafic igneous or sedimentary rock (e.g., Actinolite-Chlorite Schist)

Chert (specifically Flint or Jasper variant)

Cryptocrystalline Quartz (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline quartz (SiO2)

Chert (specifically Flint or Jasper variant)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Novaculite variant)

Chert (Microcrystalline Quartz, SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Chalcedony/Flint variant)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Flint or Jasper variant)

Chert (Siliceous rock composed of microcrystalline Quartz, SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline Quartz (SiO2)

Mixed Gemstone Bracelet

Mixed natural minerals and rocks (e.g., Rhodonite, Malachite, Sodalite, Rose Quartz, Black Tourmaline, Quartz/Chalcedony variants)

Red Jasper (Mahogany Obsidian variant similarity)

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert (including Flint and Jasper variants)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Tiger's Eye (likely variant or dark tumble)

Pseudomorph of Quartz after Crocidolite (SiO2)

Jasper (specifically Red or Brecciated Jasper variant)

Jasper (Microcrystalline Quartz - SiO2)

Jasper with Cinnabar (Dragon Blood Jasper variant)

Silicon Dioxide with Mercury Sulfide (SiO2 + HgS)

Jasper (Green Jasper / Bloodstone variant base)

Silicon Dioxide (SiO2) with impurities of chlorite and iron oxides

Tiger's Eye (likely Hawk's Eye variant)

Pseudomorph of Quartz after Crocidolite (SiO2)

Sea Glass (Uranium/Vaseline Glass variant)

Silicon Dioxide (SiO2) with trace Uranium Oxide (U3O8)

Chert (often called Flint for dark variants)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz River Cobble (Yellow Jasper/Quartzite variant)

Quartzite (primarily Silicon Dioxide, SiO2)

Banded Calcite (often sold as 'Ocean Jasper' or 'Caribbean Calcite' variant)

Calcium Carbonate (CaCO3) with potential Aragonite inclusions

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)