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

Smoky Quartz

Silicon Dioxide (SiO2)

Tumbled purple jasper (likely rhyolite-derived jasper)

Microcrystalline quartz (SiO₂) with iron/manganese oxide impurities; possibly purple rhyolitic jasper

Banded Onyx (Calcite Marble)

Calcite (CaCO3) - Trap-rock or Cave Onyx

Jasper

Silicon dioxide (SiO2)

Dyed Agate Slice

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Polished yellow-orange chalcedony (likely carnelian)

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

Onyx (beads)

SiO2 (Cryptocrystalline Quartz)

Banded Agate (specifically Botswana Agate or Water-line Agate)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Red Chalcedony (likely dyed)

Chalcedony (a variety of Quartz), SiO2

Red Jasper

Microcrystalline Quartz (SiO2) with iron oxide inclusions

Jasper Geode

Silicon Dioxide (SiO2) with impurities

Yellow Quartz (Chalcedony/Agate)

Silicon Dioxide (SiO2)

Banded Agate (specifically Carnelian Agate color)

Silicon Dioxide (SiO2) - variety of Chalcedony

Ocean Jasper

Spherulitic Chalcedony (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Banded Jasper (Chert)

Silicon Dioxide (SiO2) - variety of Chalcedony

Banded Agate (specifically Eye Agate / Chalcedony)

Agate (Cryptocrystalline variety of Quartz, SiO2)

Tumbled yellow jasper or petrified wood fragment

Microcrystalline quartz (chalcedony), SiO₂, possibly iron-oxide-bearing jasper

Tumbled Yellow Chalcedony / Iron-Stained Quartz

Silicon Dioxide (SiO2)

Black Onyx

Silicon dioxide (SiO2)

Tumbled yellow jasper or silicified rock fragment

Microcrystalline quartz (chalcedony), SiO₂, likely iron-oxide colored

Banded Agate

Chalcedony / Silicon Dioxide (SiO2)

Polished amber-colored translucent stone, likely citrine or yellow chalcedony

Most consistent with quartz (SiO₂), potentially citrine; translucent yellow chalcedony is another possibility

Yellow Jasper

Silicon Dioxide (SiO2) - Impure Cryptocrystalline Quartz

Druzy Agate (specifically Black Druzy Agate)

Silicon Dioxide (SiO2)

Green Aventurine

Aventurine (a variety of Quartz, SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Tumbled jasper or iron-rich chert

Microcrystalline quartz (SiO₂), likely colored by iron oxides

Orange-red jasper pebble

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

Tumbled orange chalcedony (likely carnelian)

Cryptocrystalline quartz, SiO₂; orange variety commonly called carnelian

Tumbled jasper or jasper-rich chert

Microcrystalline quartz (SiO₂) with iron-oxide impurities

Banded Agate (specifically Carnelian Agate)

Silicon dioxide (SiO2) - Chalcedony variety

Dyed Imperial Jasper (Sea Sediment Jasper)

Silicon Dioxide (SiO2) - Impure Quartz/Chalcedony

Polished carnelian agate

Microcrystalline quartz (chalcedony), SiO₂, iron-oxide colored

Agate (specifically Carnelian Agate or Sardagate)

Silicon dioxide (SiO2) - variety of chalcedony

Jasper (specifically Owyhee or Picture Jasper variety)

Jasper (Silicon Dioxide, SiO2)

Tumbled brown chalcedony (likely carnelian/agatesque material)

Microcrystalline quartz, SiO₂; chalcedony variety

Chrysoprase-bearing Quartz

Silicon Dioxide with Nickel Inclusions (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Tumbled jasper (likely brecciated or red jasper)

Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions

Polished orange agate or chalcedony

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

Chalcedony with Quartz

Silicon Dioxide (SiO2)