Organic Material (Likely A Fruit Or Berry)

Jasper

Jasper (Silicon Dioxide, SiO2)

Green Fluorite

Calcium Fluoride (CaF2)

Chert (River Cobble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Quartz (Microcrystalline/Chert)

Silicon Dioxide (SiO2)

Chert (Chalcedony/Agate)

Microcrystalline Quartz (SiO2)

Chert (and Flint)

Microcrystalline Silica (SiO2)

Chalcedony (Botryoidal or Agate nodule)

Silicon Dioxide (SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Greenstone

Chlorite schist / Meta-basalt

Chert (Jasper/Agate variety)

Microcrystalline quartz (SiO2)

Quartz with Limonite Staining

Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)

Chert (Green variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Zebra Jasper

Silicon Dioxide (SiO2) with impurities; typically a form of Chalcedony/Microcrystalline Quartz

Crinoid Fossil in Limestone

Crinoid (Class Crinoidea) in Fossiliferous Limestone (CaCO3)

Conglomerate

Conglomerate (clastic sedimentary rock)

Chert (variations include Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Flint variant)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (and Quartz Gravel)

Chert (Cryptocrystalline Quartz, SiO2)

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Hematite inclusions

Chert (Green variety)

Cryptocrystalline Quartz (SiO2)

Chert (often called Flint or Jasper)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (White-Tan variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Dragon Stone

Ohko Stone (Argillaceous sedimentary rock)

Chert (with Iron Staining)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Turquoise

Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O

Coquina

Bioclastic Limestone (composed primarily of CaCO3)

Chert / Flint

Microcrystalline Quartz (SiO2)

Chert (Flint)

Chert (Cryptocrystalline Quartz, SiO2)

Chert (Jasper variation)

Chert (SiO2)

Chert (Quartz Variety)

Chert (mostly SiO2 / Silicon Dioxide)

Chert (White-Grey variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (with Lichen)

Microcrystalline Quartz (SiO2)

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Concrete

Anthropogenic Sedimentary Conglomerate (Cement mixture: typically Ca2SiO4, Ca3SiO5, Ca3Al2O6)

Chert (often called Flint in this context)

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Chert (and/or Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Quartz (Small fragments)

Silicon Dioxide (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Red Chert (Jasper)

Silicon Dioxide (SiO2)

Chert (Commonly known as Flint or Jasper when pigmented)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Scoria

Extrusive Basaltic Scoria