Mineral_variety_of_chalcedony

Polished orange agate or chalcedony

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

Tumbled carnelian (likely)

Orange-red chalcedony, microcrystalline quartz (SiO₂)

Tumbled brown chalcedony (likely jasper or agate)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide staining

Yellow Chalcedony (Agate/Carnelian)

Silicon Dioxide (SiO2)

Jasper or Agate pendant

Silicon dioxide (SiO2)

Gray Agate

Cryptocrystalline Quartz (SiO2)

Agate

SiO2

Blue Chalcedony

Silicon Dioxide (SiO2)

Blue Agate

Chalcedony (SiO2)

Polished banded agate pendant

Agate, microcrystalline quartz (SiO₂), a chalcedony variety

Green Jasper

Silicon Dioxide (SiO2) with iron silicate inclusions

Banded Calcite (often sold as Orange Onyx or Mexican Onyx)

Calcium Carbonate (CaCO3)

Ocean Jasper

Spherulitic Chalcedony (SiO2)

Tumbled jasper (likely brecciated or ocean jasper)

Microcrystalline quartz (SiO₂), with iron-oxide staining and possible chalcedony

Agate

Agate (Silicon Dioxide, SiO2)

Banded Agate

Agate (Silicon Dioxide - SiO2)

Tumbled brown jasper

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

Polished jasper pebble

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

Tumbled jasper/chert, possibly brecciated jasper

Microcrystalline quartz (SiO₂), with iron-oxide staining and possible chalcedony

Tumbled brown jasper

Jasper, microcrystalline quartz (SiO₂), commonly colored by iron oxides

Polished/tumbled brown jasper or iron-rich chert

Microcrystalline quartz (SiO₂), commonly colored by hematite/goethite

Polished jasper (likely brecciated or red jasper)

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide pigments and possible breccia fragments

Red jasper (likely iron-rich chert)

Microcrystalline quartz, SiO₂, colored mainly by hematite/goethite

Red jasper (probable)

Microcrystalline quartz/chalcedony (SiO₂) colored by iron oxides

Tumbled dark reddish-brown stone, possibly red jasper

Jasper, microcrystalline quartz (SiO₂), likely iron-oxide colored

Polished jasper and banded agate specimens

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other inclusions

Tumbled jasper or iron-rich chert

Microcrystalline quartz (SiO₂), likely colored by iron oxides

Polished brecciated jasper (likely septarian or iron-rich jasper)

Microcrystalline quartz (chalcedony), SiO₂, with iron oxides and possibly calcite or other rock fragments

Jasper

Silicon dioxide (SiO2)

Tumbled chalcedony (likely carnelian or brown agate)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

Yellow Chalcedony

Silicon Dioxide (SiO2)

Botryoidal Chalcedony

Cryptocrystalline Silicon Dioxide (SiO2)

Agate (Chalcedony)

Cryptocrystalline Quartz (SiO2)

Ocean Jasper

Spherulitic Chalcedony (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with goethite or limonite inclusions

Dendritic Agate or Moss Agate Nodules (Septarian-like)

Chalcedony with mineral inclusions (SiO2)

Red jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

Polished brecciated jasper (likely)

Jasper, microcrystalline quartz (SiO₂), with contrasting mineral fragments or veins

Red jasper (likely)

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored by iron oxides

Polished brown jasper (probable ocean jasper or iron-rich jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides and other inclusions

Tumbled carnelian (likely)

Cryptocrystalline quartz, SiO₂; reddish chalcedony colored mainly by iron oxides

Tumbled brown agate (probable)

Microcrystalline quartz, SiO₂ (chalcedony/agate)