Mineralloid (Organic Gemstone)

Chert (specifically Jasper or Flint type)

Microcrystalline Quartz (SiO2)

Chert (Chert Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert Pebble

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Chalcedony/Agate)

Microcrystalline Quartz (SiO2)

Chert (Field Flint)

Microcrystalline Quartz (SiO2)

Banded Chert / Flint

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide / Chalcedony)

Chert (Black Flint)

Silicon Dioxide (SiO2)

Chert (Flint nodule)

Chert (SiO2)

Chert (Chalky/Gray Variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Pearl

Calcium Carbonate (CaCO3) in the form of orthorhombic Aragonite and Conchiolin

Baroque Pearl

Calcium Carbonate (Aragonite or Calcite) and Conchiolin

Amber (Cherry Amber)

Succinite (C10H16O)

Amber (possibly polished or rough amber)

Natural fossil resin; not a mineral, with variable organic composition dominated by polymerized terpenes

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Jasper (Red-Brown)

Silicon Dioxide (SiO2) with Iron Oxide impurities

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Pink variety)

Microcrystalline Quartz (SiO2)

Chert (specifically Red Chert/Jasper variety)

Silicon Dioxide (SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2)

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)

Pearl (Imitation or Cultured)

Calcium Carbonate (Aragonite/Calcite) - CaCO3

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)