Sedimentary (Microcrystalline Quartz)

Chert / Flint

Cryptocrystalline Quartz (SiO2)

Jasper with Dendritic Inclusions

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Jasper

Silicon dioxide (SiO2) with iron impurities

Chert (Iron-stained)

Chert (Microcrystalline and Cryptocrystalline Quartz, SiO2)

Chert (specifically a weathered Chert nodule or fragment)

Chert; Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (or Flint)

Chert (microcrystalline or cryptocrystalline quartz, SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Jasper or Flint variant)

Chert (composed of microcrystalline quartz, SiO2)

Chert (specifically a Worked Flint/Knapped Flake)

Chert / Flint (Microcrystalline Quartz, SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (often called Flint or Jasper when red)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Jasper variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (and Limestone)

Chert (consisting of Microcrystalline Quartz, SiO2)

Chert (specifically Flint or Gray Chert)

Silicon Dioxide (Microcrystalline Quartz), SiO2

Chert (specifically Gray/Black Chert)

Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)

Chert (Nodule)

Chert (primarily Microcrystalline Quartz - SiO2)

Chert Nodules (with Gryphaea or Shell inclusions)

Microcrystalline Quartz (SiO2) with Calcitic inclusions

Chert / Flint

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Picture Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Flint nodule)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Banded Chert

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (specifically Yellow Jasper variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Jasper Pebble

Tumbled Jasper (Microcrystalline Quartz, SiO2)

Chert (varieties include Flint and Jasper)

Silicon Dioxide (SiO2) / Microcrystalline Quartz

Chert (Chert Nodule)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (often called Flint or Jasper depending on color)

Chert (SiO2 - Microcrystalline or Cryptocrystalline Quartz)

Chert (varieties include Flint and Jasper)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Jasper (likely river-worn)

Silicon Dioxide (SiO2)

Red Jasper (Microcrystalline Quartz)

SiO2 (Silicon Dioxide) with Iron Oxide inclusions

Dendritic Agate

Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)

Glauconitic Sandstone

Glauconitic Quartz-Wacke / Sandstone (Fe(II),Fe(III),Al,Mg)2-3(Si,Al)4O10(OH)2

Carnelian

Silicon dioxide (SiO2) with Iron Oxide impurities (Fe2O3)

Chert (Quartz)

Microcrystalline Silica (SiO2)

Chert (Iron-stained)

Chert (primarily Microcrystalline Quartz, SiO2)

Chalcedony (Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Jasper with Agate Inclusions

Silicon Dioxide (SiO2) - variety of Quartz/Chert

Zebra Jasper

Silicon Dioxide (SiO2) with various inclusions

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Petrified Wood

Silicified Wood (SiO2)

Chert (Flint Nodules)

Silicon Dioxide (SiO2)