Mineral (Chalcedony Variety)

Chalcedony (likely agate)

Microcrystalline quartz, SiO₂; agate is banded chalcedony

Light-colored agate (likely chalcedony)

Chalcedony, microcrystalline quartz (SiO₂); exact variety is uncertain from the image

Yellow Jasper

SiO2

Carnelian

Silicon dioxide (SiO2) with Iron Oxide impurities

Orange chalcedony or tumbled carnelian fragment

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

Polished carnelian/chalcedony

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony

Polished yellow-orange stone pendant, possibly carnelian or yellow chalcedony

Chalcedony, microcrystalline quartz (SiO₂); identification from the photo is uncertain

Tumbled orange chalcedony or carnelian

Microcrystalline quartz (SiO₂), commonly iron-stained chalcedony; likely carnelian

Tumbled orange chalcedony or carnelian

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony

Tumbled translucent quartz or chalcedony fragment

Silicon dioxide, SiO₂; likely quartz/chalcedony

Tumbled chalcedony (likely pale agate or quartz)

Chalcedony, microcrystalline SiO₂

Red Chalcedony (likely dyed)

Chalcedony (a variety of Quartz), SiO2

Polished brecciated jasper (likely picture jasper)

Silica-rich microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and clay inclusions

Polished orbicular jasper

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

Tumbled carnelian

Carnelian, orange chalcedony (microcrystalline SiO₂)

Jasper (Iron-stained Quartzite/Chert)

Silicon Dioxide (SiO2) with iron oxide inclusions

Agate

SiO2 (Silicon dioxide, chalcedony variety)

Tumbled carnelian/chalcedony

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony

Tumbled agate/chalcedony (likely moss or plume agate)

Microcrystalline quartz, SiO₂, chiefly chalcedony with possible iron-oxide inclusions

Tumbled amber-brown chalcedony (probable carnelian/ag ate)

Microcrystalline quartz, SiO₂; likely iron-stained chalcedony (carnelian)

Red jasper-like chalcedony pebble

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

Small tumbled stone, possibly moss agate

Likely chalcedony (microcrystalline SiO₂); exact identification is uncertain from the image

Chalcedony with jasper (likely brecciated jasper)

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

Tumbled red-brown stone, likely jasper

Jasper, microcrystalline quartz (SiO₂), probably iron-oxide-bearing chert

Bloodstone (Heliotrope)

Cryptocrystalline Quartz (SiO2) with inclusions of Hematite or Chlorite

Ocean Jasper

Silicon dioxide with impurities (SiO2 + impurities)

Polished ocean jasper / orbicular jasper (likely)

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

Polished banded agate

Banded chalcedony, microcrystalline quartz (SiO₂)

Tumbled carnelian and related stones

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

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite inclusions

Banded Jasper

Silicon Dioxide with Iron Oxide impurities (SiO2)

Tumbled jasper, likely red/brown jasper

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

Lake Superior Agate

Silicon Dioxide (Chalcedony variety)

Polished banded agate

Microcrystalline quartz (chalcedony), SiO₂

Polished orbicular jasper (likely ocean jasper)

Silicified microcrystalline quartz (SiO₂), commonly called orbicular jasper or ocean jasper

Polished banded jasper (likely picture jasper)

Microcrystalline quartz, chiefly SiO₂; jasper with iron-oxide staining

Jasper (likely brecciated jasper)

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

Jasper

Silicon dioxide (SiO2) with iron oxide impurities

Bloodstone

Heliotrope

Jasper (Green Jasper/Heliotrope variety)

Silicon Dioxide (SiO2)

Tumbled carnelian/chalcedony

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

Agate (Carnelian / Chalcedony)

Silicon Dioxide (SiO2)