Mineraloid (Organic Gemstone)

Natural or Cultured Pearl

Calcium Carbonate (Aragonite and Conchiolin), CaCO3

Chert (and Chert-based Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (and Quartzite)

Microcrystalline silica (SiO2)

Polished amber cabochon

Amber (fossilized plant resin; chiefly carbon, hydrogen, and oxygen, with variable organic compounds)

Baltic amber beads

Amber (fossilized plant resin), commonly succinite; organic polymer dominated by resin acids

Polished amber

Fossilized plant resin; primarily organic terpenoid compounds (succinite when Baltic-type)

Chert / Flint

Microcrystalline or cryptocrystalline quartz (SiO2)

Chert (Chalcedony)

Silicon Dioxide (SiO2)

Green Jasper

Silicon Dioxide (SiO2) with impurities

Chert (varietal Flint or Jasper)

Microcrystalline Quartz (SiO2)

Weathered chert or silicified limestone

Microcrystalline quartz (SiO₂), likely chert formed by silicification of carbonate rock

Chert (Brown Variety)

Silicon dioxide (SiO2)

Chert (Jasper variety)

Chert (SiO2)

Chert (Flint Nodules)

Chert (Microcrystalline Quartz, SiO2)

Chert (Flint)

Microcrystalline or cryptocrystalline quartz (SiO2)

Chert (Iron-rich variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Yellow Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (White-Tan variety)

Silicon dioxide (SiO2) / Microcrystalline Quartz

Tumbled amber (likely)

Amber; fossilized plant resin, commonly succinite (organic material rather than a mineral)

Chert (specifically Tan/Yellow Chert)

Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)

Chert (Nodular)

Chert (SiO2 - Microcrystalline Quartz)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (Commonly known as Flint or Jasper when pigmented)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (variations include Flint/Jasper)

Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Translucent amber-colored gemstone, likely citrine or amber

Most plausibly quartz (SiO₂), specifically citrine; amber would be fossilized resin (organic polymer)

Chert (Flint variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Amber

Succinite (specifically for Baltic Amber), Formula: C10H16O

Red Jasper

Jasper (Silicon Dioxide, SiO2 with iron oxide impurities)

Chert (often called Flint or Jasper)

Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)

Chert (often called Flint when dark)

Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)

Chert / Flint

Cryptocrystalline Quartz (SiO2)

Chert (Commonly known as Flint)

Microcrystalline Quartz (SiO2)

Amber (rough amber piece)

Fossilized plant resin; predominantly polymerized terpenoid resin (succinite, when Baltic-type)

Amber

Fossilized tree resin; primarily an organic polymer of terpenoid compounds (succinite when Baltic-type)

Chert / Flint

Cryptocrystalline Quartz (Silicon Dioxide, SiO2)

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (varieties include Flint and Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (and Chalcedony)

Microcrystalline Quartz (SiO2)

Chert (Cherty Flint/Jasper variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)