Sedimentary (Secondary Classification: Cryptocrystalline Quartz)

Jasper pebble

Silicon dioxide (SiO2) with iron oxide inclusions

Sandstone Cobble

Arenite (Secondary classification based on grain size)

Lunar Feldspathic Breccia

Lunar Meteorite (Feldspathic Regolith Breccia)

Chalcedony in Limestone Host Rock

Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)

Red Siltstone

Siltstone (composed mainly of SiO2 and Fe2O3)

Lunar Highlands Breccia (Meteorite)

Lunar Feldspathic Breccia

Breciated Chert

Brecciated Chert (Microcrystalline Quartz, SiO2)

Jasper

Cryptocrystalline Quartz (SiO2)

Rough Agate/Chert Nodules

Cryptocrystalline Quartz (SiO2)

Jasper (specifically Bloodstone/Heliotrope or Dark Green Jasper)

Cryptocrystalline Quartz (SiO2) with inclusions

Banded Chert

Cryptocrystalline Quartz (SiO2)

Jasper or Chert with Quartz Vugs

Silicon Dioxide (SiO2)

Chert (with Quartz Vein)

Microcrystalline silica (SiO2)

Quartz (Chert/Chalcedony Variety)

Silicon Dioxide (SiO2)

Banded Agate

Agate (Cryptocrystalline Quartz, SiO2)

Chert Pebble with Quartz Veins

Microcrystalline Quartz (SiO2)

Chalcedony on Matrix

Silicon Dioxide (SiO2)

Chert (with Quartz Veining)

Microcrystalline Quartz (SiO2)

Jasper or Chert

Silicon Dioxide (SiO2)

Chert (Arrowhead Preform or Flake)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Chalcedony variety)

Silicon Dioxide (SiO2)

Chert with Quartz Veining

Silicon Dioxide (SiO2)

Chert (containing Orbicular/Agate patterns)

Microcrystalline Quartz (SiO2)

Agate

Silicon Dioxide (SiO2) - variety Chalcedony

Snakeskin Agate

Agate (Cryptocrystalline Quartz, SiO2)

Chert (Nodular)

Chert (Microcrystalline Quartz, SiO2)

Chert (specifically a stream-worn Chert Nodule)

Sedimentary Cryptocrystalline Quartz (SiO2)

Chert (with Quartz veins)

Microcrystalline Quartz (SiO2)

Chert (Banded Variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Dyed Agate (Tumbled)

Silicon Dioxide (SiO2) - stained microcrystalline quartz

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chalcedony (Yellow/Honey variety)

Microcrystalline Quartz (SiO2)

Agate Nodule (partially vuggy Quartz)

Silicon Dioxide (SiO2)

Agate (Geode nodule fragment)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Jasper with Quartz Veining

Silicon Dioxide (SiO2) with iron oxide inclusions

Jasper with Quartz Veining

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartz Geode in Chert/Limestone Matrix

Silicon Dioxide (SiO2) within Sedimentary Host Rock

Bituminous Coal (with Anthracite or Vitrinite inclusion)

Organic-rich Sedimentary Rock (Carboniferous classification)

Chert Pebble (with Quartz Vein)

Chert (Cryptocrystalline Silica - SiO2)

Chert / Flint (with quartz or calcite inclusion)

Silicon dioxide (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (Septarian or Nodular variety)

Microcrystalline Quartz (SiO2)