Mineral (Specifically A Variety Of Chalcedony, Which Is A Cryptocrystalline Quartz)

Tumbled brown jasper or chalcedony

Microcrystalline quartz (SiO₂), likely iron-stained jasper/chalcedony

Tumbled jasper, likely red/brown jasper

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

Milky Quartz

Silicon Dioxide (SiO2)

Brown agate (chalcedony)

Microcrystalline quartz, SiO₂; likely iron-stained chalcedony

Flower Agate (Plume Agate)

Chalcedony (Silicon Dioxide) with Spherulitic Inclusions - SiO2

Polished carnelian (red-orange chalcedony)

Carnelian, a cryptocrystalline variety of quartz (SiO₂), commonly colored by iron oxides

Tumbled jasper (likely brecciated or mahogany jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide inclusions

Polished orbicular jasper

Microcrystalline quartz (SiO₂) with iron-rich and altered volcanic inclusions

Chalcedony with jasper (likely brecciated jasper)

Microcrystalline quartz, SiO₂, with iron-oxide-rich jasper fragments

Chalcedony

Chalcedony (a microcrystalline variety of Quartz, SiO2)

Tumbled carnelian

Carnelian, orange chalcedony (microcrystalline SiO₂)

Quartz (chalcedony variety) or Limestone with Quartz Veins

SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)

Agate (specifically Carnelian or Honey Agate)

Silicon Dioxide (SiO2)

Chalcedony (specifically Agate or Moonstone-like Quartz)

Silicon Dioxide (SiO2)

Blue Chalcedony

Silicon Dioxide (SiO2)

Chert / Jasper

Microcrystalline Quartz (SiO2)

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

Bloodstone (Heliotrope)

SiO2 (Cryptocrystalline Quartz / Chalcedony)

Red Jasper

Silicon dioxide (SiO2) with hematite (Fe2O3) inclusions

Tumbled carnelian/chalcedony

Orange chalcedony (microcrystalline quartz), SiO₂; possibly iron-stained agate

Chalcedony

Cryptocrystalline Quartz (SiO2)

Polished carnelian/chalcedony

Carnelian, a reddish-orange variety of microcrystalline quartz (SiO₂)

Jasper (likely brecciated jasper)

Microcrystalline quartz, SiO₂, colored by iron oxides

Chalcedony (Agate/Quartz variety)

Cryptocrystalline Quartz (SiO2)

Polished carnelian/chalcedony

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony

Chalcedony

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Tumbled jasper (likely brecciated or red jasper)

Jasper, microcrystalline quartz/chalcedony (SiO₂), colored by iron oxides

Chert (and Flint)

Silicon Dioxide (SiO2)

Agate geode fragment

Banded chalcedony (microcrystalline SiO₂), lining a geode cavity

Agate (Grey Agate Slice)

Microcrystalline Quartz (SiO2)

Polished red jasper (likely brecciated or orbicular jasper)

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

Blue Chalcedony

Silicon Dioxide (SiO2)

Polished honey/brown agate (likely carnelian chalcedony)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

Tumbled jasper or jasper-rich chert

Microcrystalline quartz (SiO₂) with iron-oxide impurities

Tumbled carnelian and related stones

Carnelian: orange-red chalcedony, microcrystalline SiO₂; the dark central piece may be hematite- or jasper-rich material

Milky chalcedony cabochon ring

Chalcedony, microcrystalline quartz (SiO₂), likely white or pale agate variety

Tumbled jasper or iron-rich chert

Microcrystalline quartz (SiO₂), likely colored by iron oxides

Dalmatian Jasper

Dalmatian Stone (Felsite with Arfvedsonite/Tourmaline)

Quartz (Agate/Chalcedony)

Silicon Dioxide (SiO2)

Agate Geode

Banded Chalcedony (Silicon Dioxide, SiO2) with Quartz crystals

Blue Chalcedony

Silicon Dioxide (SiO2)