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

Quartz Pebbles and Agates

Silicon Dioxide (SiO2)

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

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

Carnelian Agate Nodule

Chalcedony (SiO2) with Iron Oxide inclusions

Carnelian (a variety of Chalcedony)

Silicon Dioxide (SiO2) with iron oxide impurities

Dyed Blue Agate

Silicon dioxide (SiO2) with artificial pigment

Chalcedony (Common Opal variant or Agate)

Silicon Dioxide (SiO2)

Jadeite

Jadeite (NaAlSi2O6)

Carnelian (Chalcedony)

SiO2 (Silicon Dioxide - Microcrystalline Quartz)

Chalcedony

Silicon Dioxide (SiO2)

Tumbled red jasper

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

Tumbled jasper or iron-rich chert

Microcrystalline quartz (SiO₂), likely with iron-oxide inclusions

Tumbled yellow jasper

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

Banded jasper (likely mookaite or brecciated jasper)

Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and clay inclusions

Polished/tumbled jasper or chert pebble

Microcrystalline quartz (SiO₂), likely ferruginous jasper/chert

Chrysoprase

Silicon Dioxide (Chalcedony variety), SiO2

Agate (specifically Lake Superior Agate style or Banded Chalcedony)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Tumbled Green Jasper

Silicon Dioxide (SiO2) with mineral inclusions

Polished pink chalcedony (possibly carnelian)

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

Chert (Yellow Jasper)

Microcrystalline Quartz (SiO2)

Tumbled carnelian/chalcedony

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

Polished yellow chalcedony (likely quartz pebble)

Chalcedony, microcrystalline quartz (SiO₂), possibly iron-stained jasper

Black Onyx

Silicon dioxide (SiO2) - Chalcedony variety

Tumbled carnelian (orange chalcedony)

Carnelian, a microcrystalline quartz variety; SiO₂, commonly colored by dispersed iron oxides

Green Jasper with Agate Banding

Silicon Dioxide (SiO2) with impurities of ferrous silicate or chlorite

Fancy Jasper

Cryptocrystalline Quartz (SiO2) with iron oxide inclusions

Yellow Chalcedony (Agate)

Silicon Dioxide (SiO2)

Quartz (Chalcedony/Agate nodule)

Silicon dioxide (SiO2)

Quartz (Agate/Chalcedony variety)

Silicon Dioxide (SiO2)

Botryoidal chalcedony (likely agate/jasper variety)

Microcrystalline quartz, SiO₂

Red jasper

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

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Polished tiger-eye jasper / iron-rich jasper

Quartz-rich jasper (microcrystalline SiO₂) with iron oxides, likely hematite/goethite and magnetite

Red jasper pebble

Jasper, microcrystalline quartz (SiO₂) colored by iron oxides

Tumbled yellow jasper

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

Tumbled jasper, likely picture or brecciated jasper

Microcrystalline quartz (SiO₂) with iron-oxide and other mineral impurities

Tumbled blue-green stone, likely dyed agate

Agate (microcrystalline quartz, SiO₂); blue coloration may be artificial

Banded Agate (specifically Sardonyx or Black Agate variety)

Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz

Chalcedony (Agate/Chert variety)

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Tumbled brown jasper

Microcrystalline quartz (SiO₂), commonly with iron-oxide inclusions

Orbicular Jasper (Ocean Jasper tendency)

Silicon Dioxide (SiO2) with impurities

Agate

Silicon dioxide (SiO2)