Mineral (Silicate Replaced Organic Material)

Quartz / Common Opal Transition

Silicon Dioxide (SiO2)

Chert (varieties include Jasper or Flint)

Chert (Microcrystalline Silica, formula: SiO2)

Chert (Pebble)

Microcrystalline silica (SiO2)

Fossilized Shark Tooth (Otodus obliquus)

Otodus obliquus (composed primarily of Fluorapatite)

Basalt with Epidote (Flowerstone-like texture)

Amygdaloidal Basalt (silicate mineral inclusions)

Banded Chert

Microcrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Amber

Succinite (C10H16O)

Chert (Nodule)

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

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.

Wood Jasper

Siliceous sedimentary rock (variety of Chert/Chalcedony)

Chert (specifically Red Chert / Jasper)

Silicon Dioxide (SiO2)

Amber and Citrine Quartz

Succinite (Amber) and Silicon Dioxide (SiO2 / Citrine)

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Chert (often called Flint or Jasper based on color)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Clay (as a rock-forming material)

Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)

Tiger's Eye

Tiger's Eye (Pseudomorph of Quartz after Crocidolite), SiO2

Pumice

Pumice (volcanic glass with vesicular texture)

Blue Zircon

Zirconium Silicate (ZrSiO4)

Amber

Succinite (fossilized tree resin)

Chert Pebble

Microcrystalline Quartz (SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert / Jasper

Silicon Dioxide (SiO₂)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Travertine

Calcareous tufa (CaCO3)

Chert (often called Flint in archaeological contexts)

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chert (often called Flint when dark or worked)

Cryptocrystalline silica (SiO2)

Chert (variations include Flint or Jasper)

Silicon Dioxide (SiO2)

Chert (often called Flint)

Chert (Cryptocrystalline Quartz, SiO2)

Fossil / Permineralized Bone

Tyrannosaurus rex fossil (Hydroxylapatite replaced by various minerals)

Chert (Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Jasper/Ironstone variety)

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert (Brown Variety)

Microcrystalline quartz (SiO2)

Chert (specifically Jasper/Flint)

Microcrystalline Quartz (SiO2)

Brachiopod Fossil in Limestone

Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions