Mineral (Cryptocrystalline Quartz)

Blue Chalcedony (Tumbled)

Silicon Dioxide (SiO2)

Quartz Pebble (Smoky Quartz / Chalcedony)

Silicon Dioxide (SiO2)

Chert (Cherty Limestone / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Jasper

Jasper (Cryptocrystalline Quartz; SiO2)

Tumbled brown jasper

Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides

Tumbled chalcedony (likely moss or gray agate)

Microcrystalline quartz, SiO₂; chalcedony/agate variety

Polished Ocean Jasper

Orbicular jasper (microcrystalline quartz, SiO₂)

Botryoidal Chalcedony

Silicon Dioxide (SiO2)

Pink chalcedony (pink agate-like quartz)

Microcrystalline quartz, SiO₂ (chalcedony; likely iron-bearing)

Chert (variously known as Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (varieties include Flint and Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Tumbled brown banded agate beads

Agate, a banded variety of microcrystalline quartz (SiO₂)

Flower Agate

Chalcedony (SiO2) with Scolecite/Opaque inclusions

Tumbled agate/chalcedony pebble

Microcrystalline quartz (SiO₂), likely gray chalcedony with iron-oxide or other mineral inclusions

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Tumbled Chalcedony Pebble

Silicon Dioxide (SiO2)

Agate in Rhyolite

Silicon Dioxide (Quartz/Chalcedony) in Volcanic Rock matrix

Red jasper or iron-rich quartz/chalcedony

Microcrystalline quartz, SiO₂, colored mainly by hematite/goethite inclusions

Tumbled Chalcedony

Quartz (Silicon Dioxide - SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Green Quartz

Silicon Dioxide (SiO2)

Chert (specifically Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chalcedony (Common Agate)

Silicon Dioxide (SiO₂)

Yellow-orange chalcedony (possibly carnelian)

Microcrystalline quartz, SiO₂; orange coloration commonly from iron oxides

Iron-rich jasper or brecciated chert

Microcrystalline quartz (SiO₂) with hematite/goethite inclusions

Polished red jasper (likely brecciated or orbicular jasper)

Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions

Tumbled agate (likely carnelian/botryoidal chalcedony)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

Tumbled amber-colored chalcedony (likely carnelian)

Chalcedony, microcrystalline quartz (SiO₂); orange-red variety called carnelian

Yellow chalcedony (likely honey agate/jasper)

Microcrystalline quartz, SiO₂; may contain iron-oxide inclusions

Polished orbicular jasper (likely ocean jasper or brecciated jasper)

Microcrystalline quartz (SiO₂), with iron oxides and accessory chlorite/zeolite minerals

Polished brown jasper pebble with a quartz vein

Jasper (microcrystalline quartz, SiO₂), traversed by quartz or chalcedony

Polished banded agate or jasper nodule

Microcrystalline quartz (chalcedony), SiO₂, possibly iron-oxide-rich jasper

Polished carnelian/chalcedony agate

Microcrystalline quartz (SiO₂), chiefly chalcedony with iron-oxide coloring

Chert / Flint

Microcrystalline Quartz (SiO2)

Chert (Flint nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (often called Flint or Jasper based on color)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Gray Chert/Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chalcedony (Agate/Carnelian)

Cryptocrystalline Silicon Dioxide (SiO2)

Carnelian (Chalcedony)

Silicon Dioxide (SiO2) with Iron Oxide impurities