Mineral, Variety Of Chalcedony (Microcrystalline Quartz)

Tumbled blue chalcedony (likely blue agate)

Microcrystalline quartz, SiO₂; chalcedony/agate variety

Jasper

Jasper (Silica/Quartz) - SiO2

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Leopard Skin Jasper

Chalcedony (cryptocrystalline quartz) with inclusions

Polished/tumbled agate (likely carnelian or iron-stained chalcedony)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide inclusions

Black Onyx

Silicon dioxide (SiO2) - Chalcedony variety

Polished chalcedony with iron-oxide cap (probable carnelian/agate)

Microcrystalline quartz, SiO₂, with hematite/goethite inclusions

Agate Nodules

Cryptocrystalline Quartz (SiO2)

Tumbled red/orange jasper

Jasper, microcrystalline quartz (chalcedony; SiO₂) with iron-oxide impurities

Tumbled jasper (likely brown jasper)

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

Grey Agate

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Agate

Silicon Dioxide (SiO2) - variety Chalcedony

Red Jasper

Silicon dioxide (SiO2)

Iron-rich jasper (likely brecciated jasper)

Jasper, microcrystalline quartz (SiO₂) colored by hematite/goethite and iron oxides

Chrysoprase

Silicon Dioxide (Chalcedony variety), SiO2

Polished ocean jasper (orbicular jasper), likely a small tumbled stone

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions

Chalcedony (Agate/Chert variety)

Silicon Dioxide (SiO2)

Agate

Silicon Dioxide (SiO2) - Banded Chalcedony

Tumbled pale chalcedony (likely quartz)

Microcrystalline quartz, SiO₂; possibly pale agate or quartz

Agate

Silicon dioxide (Chalcedony), SiO2

Tumbled jasper (likely picture jasper or iron-rich jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides

Ocean Jasper

Spherulitic Chalcedony (SiO2 with impurities)

Banded Agate

Agate (Silicon Dioxide, SiO2)

Polished pink agate/chalcedony pebble

Chalcedony (microcrystalline quartz, SiO₂), likely iron-stained agate

Orange chalcedony (possibly carnelian)

Microcrystalline quartz, SiO₂; iron-oxide-bearing chalcedony

Tumbled chalcedony (likely moss or dendritic agate)

Microcrystalline quartz, SiO₂, with iron-oxide inclusions

Red jasper pebble

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

Polished orange agate/jasper cabochon

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide coloration; exact variety uncertain

Chalcedony

Silicon Dioxide (SiO2)

Red jasper with druzy quartz

Jasper (microcrystalline quartz, SiO₂), locally coated or veined with crystalline quartz

Tumbled Green Jasper

Silicon Dioxide (SiO2) with mineral inclusions

Jasper

Silicon dioxide, SiO2

Lake Superior Agate

Silicon dioxide (chalcedony variety quartz)

Polished jasper pebble

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

Banded agate (likely carnelian/chalcedony)

Microcrystalline quartz (SiO₂), chalcedony; banded variety

Tumbled red jasper (probable)

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

Polished pink chalcedony (possibly carnelian)

Microcrystalline quartz, SiO₂; chalcedony variety, with exact variety uncertain from the image

Agate (Carnelian-Blue Agate mix)

Silicon Dioxide (SiO2)

Carnelian Agate

Silicon Dioxide (SiO2)

Orbicular Jasper

Silicon Dioxide (SiO2), variety of Chalcedony

Polished red jasper

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

Blue Lace Agate

Silicon Dioxide (SiO₂), a variety of Chalcedony