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

Onyx (beads)

SiO2 (Cryptocrystalline Quartz)

Jasper Geode

Silicon Dioxide (SiO2) with impurities

Yellow Quartz (Chalcedony/Agate)

Silicon Dioxide (SiO2)

Banded Jasper (Chert)

Silicon Dioxide (SiO2) - variety of Chalcedony

Agate (specifically Carnelian Agate or Sardagate)

Silicon dioxide (SiO2) - variety of chalcedony

Red Chalcedony (likely dyed)

Chalcedony (a variety of Quartz), SiO2

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Yellow jasper carving

Jasper, an opaque microcrystalline variety of quartz (SiO₂), shaped as a butterfly

Green Aventurine

Aventurine (a variety of Quartz, SiO2)

Black Onyx

Silicon dioxide (SiO2)

Banded Agate

Chalcedony / Silicon Dioxide (SiO2)

Dyed Imperial Jasper (Sea Sediment Jasper)

Silicon Dioxide (SiO2) - Impure Quartz/Chalcedony

Tumbled yellow jasper or petrified wood fragment

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

Brown chalcedony (likely agate)

Microcrystalline quartz, SiO₂; chalcedony, possibly banded agate

Red Jasper

Red Jasper (variety of Chalcedony, SiO₂)

Tumbled yellow jasper or silicified rock fragment

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

Jasper (specifically Owyhee or Picture Jasper variety)

Jasper (Silicon Dioxide, SiO2)

Druzy Agate (specifically Black Druzy Agate)

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

Smoky Quartz

Silicon Dioxide (SiO2)

Polished carnelian agate

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

Carnelian

Chalcedony (cryptocrystalline quartz), SiO2 (Silicon Dioxide)

Tumbled brown chalcedony (likely carnelian/agatesque material)

Microcrystalline quartz, SiO₂; chalcedony variety

Tumbled Yellow Chalcedony / Iron-Stained Quartz

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) - Impure Cryptocrystalline Quartz

Chalcedony with Druzy Quartz

Silicon Dioxide (SiO2)

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

Tumbled jasper or iron-rich chert

Microcrystalline quartz (SiO₂), likely colored by iron oxides

Chalcedony (specifically Agate or Water-worn Quartzite)

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Jasper

Jasper (Silicon Dioxide, SiO2 with iron inclusions)

Chalcedony

Chalcedony (a microcrystalline variety of Quartz, SiO2)

Chrysoprase-bearing Quartz

Silicon Dioxide with Nickel Inclusions (SiO2)

Polished brown jasper (likely orbicular or brecciated jasper)

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other accessory inclusions

Chalcedony with Quartz

Silicon Dioxide (SiO2)

Agate (specifically Botswana or Banded Agate variety)

Chalcedony (Silicon Dioxide, SiO2)

Yellow Jasper

Silicon dioxide (SiO2)

Red Jasper (possibly banded)

Silicon Dioxide (SiO2) with iron oxide inclusions

Banded Agate (specifically Botswana Agate appearance)

Silicon Dioxide (SiO2) - variety of Chalcedony