Mineral, Variety Of Chalcedony (Microcrystalline Quartz)

Tumbled orange chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; iron-bearing variety commonly termed carnelian

Honey-colored chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; orange chalcedony colored by iron oxides

Chalcedony (Tumbled)

Cryptocrystalline Quartz (SiO2)

Bloodstone (Heliotrope)

Cryptocrystalline Quartz (SiO2) with inclusions of Hematite or Chlorite

Gray Agate with Druzy Quartz Geode

Cryptocrystalline Quartz (SiO2)

Tumbled brown stone, likely jasper or chert

Microcrystalline quartz (SiO₂), probably iron-stained jasper/chert

Carnelian

Carnelian (Silicon Dioxide - SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Chalcedony (Botryoidal/Agate nodule)

Microcrystalline Quartz (SiO2)

Blue Agate (Dyed or Treated Chalcedony)

Silicon Dioxide (SiO2), microcrystalline quartz variety

Agate

Cryptocrystalline quartz (SiO2)

Tumbled jasper or chalcedony

Microcrystalline quartz (SiO₂), likely brown jasper/chalcedony

Tumbled jasper or chalcedony

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

Tumbled jasper or chalcedony pebble

Microcrystalline quartz, SiO₂ (likely jasper/chalcedony)

Polished carnelian jasper / brecciated jasper

Microcrystalline quartz (SiO₂), chalcedony with iron-oxide pigments and opaque jasper fragments

Tumbled orange chalcedony or carnelian

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony

Polished multicolored jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), likely iron- and manganese-stained chert

Polished chalcedony (likely moss or dendritic agate)

Microcrystalline quartz, SiO₂, with iron/manganese oxide inclusions

Chalcedony on Matrix

Silicon Dioxide (SiO2)

Quartz (Smoky Quartz / Chalcedony)

Silicon Dioxide (SiO2)

Chalcedony (Common Opal variant or Quartz)

Silicon Dioxide (SiO2)

Jasper Pendant

Silicon dioxide (SiO2) with impurities

Red jasper (likely polished/tumbled)

Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides

Red jasper pebble

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

Chalcedony (Agate Nodule)

Silicon Dioxide (SiO2)

Tumbled blue chalcedony or pale aquamarine-like quartz

Chalcedony (microcrystalline SiO₂), possibly blue quartz; visual identification is uncertain

Jasper

Silicon dioxide (SiO2) with impurities

Geode with Quartz and possibly Jasper/Hematite

Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides

Polished red jasper pebble

Jasper, microcrystalline quartz (SiO₂) colored mainly by hematite/goethite

Chalcedony Pebble / Rough Agate

Silicon Dioxide (SiO2)

Tumbled Agate and Chalcedony

Cryptocrystalline Quartz (SiO2)

Red jasper (likely tumbled)

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

Chalcedony (variations like Agate or Jasper)

Chalcedony (SiO₂ - microcrystalline quartz)

Jasper with Quartz Vein

Silicon Dioxide (SiO2)

Carnelian

Carnelian (SiO2 with Iron Oxide impurities)

Tumbled honey-brown chalcedony or agate

Microcrystalline quartz (SiO₂), likely chalcedony; exact identification requires testing

Jasper

Silicon Dioxide (Quartz variety, SiO2)

Agate Nodule

Silicon dioxide (Chalcedony/Quartz), SiO2

Bloodstone

Chalcedony (Variety Heliotrope), SiO2

Jasper with Quartz inclusions

Silicon Dioxide (SiO2)

Yellow Jasper

Cryptocrystalline Quartz (SiO2 with Iron Hydroxide inclusions)

Tumbled carnelian/chalcedony

Chalcedony (microcrystalline quartz), SiO₂; reddish color from iron oxides