Synthetic Glass (Often Categorized As A Simulated Mineral)

Amethyst

SiO2 (Silicon Dioxide)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartzite (specifically an iron-stained or Carnelian-colored variety)

Silicon Dioxide (SiO2) with iron oxide inclusions

Scoria (Lava Rock)

Vesicular Basalt / Scoria

Pumice

Pumice (Vesicular volcanic glass)

Quartz (likely tumbled or naturally water-worn)

Quartz (SiO₂ - Silicon Dioxide)

Garnet (likely Pyrope or Almandine)

Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.

Chert (Flint Nodules)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper variety)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Chert (and its variety Flint)

Silicon Dioxide (SiO2) - Microcrystalline or cryptocrystalline Quartz

Amber (and Citrine Quartz)

Succinite (Amber) and Silicon Dioxide (SiO2)

Green Banded Chert (Agate/Jasper)

Silicon Dioxide (SiO2) with trace impurities of Chlorite or Glauconite

Blue Quartzite

Quartzite (specifically a variety enriched with blue-coloring minerals)

Chert (Flint)

Chert (SiO2)

Quartz (Milky Quartz)

Quartz (SiO2 - Silicon Dioxide)

Chert (varietal: Jasper or Ironstone nodule)

Microcrystalline Quartz (SiO2) with iron oxides

Chert (often called Flint or River Stone)

Chert (Microcrystalline Silicon Dioxide, SiO2)

Chert (Flint Nodules)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Common Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Iron-stained variant)

Microcrystalline Quartz (SiO2)

Chert (Flint/Jasper variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Yellow Jasper variant)

Silicon Dioxide (SiO2)

Apache Tears (Obsidian)

Hydrated Volcanic Glass (Amorphous SiO2 + H2O)

Quartzite with Iron Hydroxide Staining

Quartzite (primarily SiO2) with Limonite/Goethite staining

Amber

Succinicum (Organic polymer, largely C10H16O)

Blue Chalcedony and Picture Jasper Beads

Blue Chalcedony (SiO2), Picture Jasper (SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Green variety)

Chert (Silicon Dioxide, SiO2)

Quartzite River Cobble

Quartzite (primarily SiO2)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Quartzite

Meta-quartzite (SiO2)

Chert Pebble (Jasperoid/Flint)

Silicon Dioxide (SiO2) - cryptocrystalline quartz

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Chert (Basanite variety) with Quartz Vein

Microcrystalline Quartz (SiO2)

Quartzite

Quartzite (SiO2)

Chert

Microcrystalline Quartz (SiO2)

Jasper Chert Nodules

Silicon Dioxide (SiO2) with Hematite impurities

Blue Lace Agate

Chalcedony (a form of Quartz) - SiO2

Chert (often called Flint)

Microcrystalline to cryptocrystalline quartz (SiO2)

Quartzite

Quartzite (SiO2)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Chert (Cherty Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)