Organic Gemstone

Chert (Jasper/Flint Pebble)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

Fossil Shark Tooth (Otodus obliquus)

Otodus obliquus; hydroxyapatite (mineralized form Ca5(PO4)3(OH))

Red Chert (Jasper)

Chert / Microcrystalline Quartz (SiO2)

Amber

Succinite (specifically for Baltic amber); C10H16O (Variable organic compound)

Chert (Nodule)

Silicon Dioxide (SiO2)

Ammolite

Biogenic gemstone (Aragonite, CaCO3)

Dendritic Opal (Common Opal)

Amorphous Hydrated Silica (SiO2·nH2O) with Manganese or Iron Oxide inclusions

Beaded Jewelry (Assorted Gemstones)

Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ

White Topaz

Al2SiO4(F,OH)2

Yellow Sapphire or Citrine

Al2O3 (Corundum) or SiO2 (Quartz)

Chert (Chert Nodule with Cortex)

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Orthoceras Fossil in Limestone

Orthoceras (extinct genus of cephalopods) in Carboniferous or Devonian Limestone

Chert (Grey/Black variety)

Chert (Silicon Dioxide, SiO2)

Chert (Jasper/Black Chert)

Silicon Dioxide (SiO2)

Chert (often called Flint in this context)

Silicon Dioxide (SiO2)

Mixed Quartz and Jasper Pebbles

Silicon Dioxide (SiO2)

Red Jasper

Silicon dioxide (SiO2) with iron oxide (Fe2O3) inclusions

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Tan/Brown variety)

Chert (Microcrystalline Quartz, SiO2)

Chert (Cherty Limestone or Flint)

Microcrystalline Silica (SiO2)

Asphalt / Bituminous Aggregate

Bituminous mixture (Hydrocarbon-based sediment)

Chert (Nodule)

Silicon Dioxide (SiO2)

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Iron-stained)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (often called Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Flint Nodules)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper variation)

Silicon Dioxide (SiO2)

Chert (Jasper-rich)

Microcrystalline/Cryptocrystalline Quartz (SiO2)

Chert (varietal Chalcedony or Flint)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Quartz Geode

Silicon Dioxide (SiO2)

Chert (Jasper/Limonitic Chert)

Microcrystalline Quartz (SiO2)

Chert with Quartz/Calcite Vein

Microcrystalline Silica (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Chert (specifically Flint or Jasper variant)

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Chert (variations include Flint/Jasper)

Cryptocrystalline Silicon Dioxide (SiO2)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Fossilized Shark Tooth (Basal Bone)

Otodus sp. (Mineralized Hydroxyapatite)

Chert (Jasper/Flint variety)

Microcrystalline quartz (SiO2)

Quartzite and Chert

Silicon Dioxide (SiO2)