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

Tumbled jasper (likely brown/yellow jasper)

Microcrystalline quartz, SiO₂, typically with iron-oxide and clay impurities

Tumbled jasper or weathered chert

Microcrystalline quartz (SiO₂), likely jasper/chert with iron-oxide impurities

Polished bloodstone (heliotrope)

Chalcedony, microcrystalline quartz (SiO₂), colored by iron-oxide inclusions

Ocean Jasper

Spherulitic Chalcedony (SiO2)

Tumbled brown jasper

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

Quartz (Milky Quartz)

Quartz (SiO2 - Silicon Dioxide)

Polished brecciated jasper

Silica-rich microcrystalline quartz (SiO₂), likely brecciated jasper with iron-oxide staining

Tumbled carnelian/chalcedony

Cryptocrystalline quartz, SiO₂ (iron-bearing chalcedony)

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Red jasper pebble

Microcrystalline quartz (SiO₂), colored by iron oxides

Blue Lace Agate

Cryptocrystalline Quartz (SiO2) with trace minerals

Chalcedony

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Tumbled orange chalcedony (probable carnelian)

Cryptocrystalline quartz, SiO₂; reddish-orange variety commonly called carnelian

Agate

Cryptocrystalline quartz (SiO2)

Tumbled gray-blue agate/chalcedony

Microcrystalline quartz (SiO₂), likely banded chalcedony or agate

Chert

Sedimentary cryptocrystalline quartz (SiO2)

Polished agate pebble (likely dyed or naturally banded chalcedony)

Chalcedony, microcrystalline SiO₂; agate is banded chalcedony

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions

Polished brown jasper pebble

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

Red jasper

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

Polished agate slice

Agate, a banded variety of chalcedony (microcrystalline SiO₂)

Tumbled yellow jasper or chert

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

Banded Jasper

Silicate Mineral (Microcrystalline Quartz / SiO2)

Polished banded agate

Agate, microcrystalline quartz (SiO₂), commonly with chalcedony and trace iron oxides

Tumbled quartz-rich pebble

Microcrystalline quartz/chalcedony, SiO₂ (tentative)

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2) with iron and magnesium inclusions

Chrysocolla in Quartz (Gem Silica)

Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) / SiO2 (Quartz)

Petrified Wood

Silicified Wood (SiO2)

Chert (Flint variety)

Chert (SiO2)

Red jasper (polished/cut rough)

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

Tumbled blue chalcedony (likely blue agate)

Microcrystalline quartz, SiO₂; chalcedony/agate variety

Tumbled orbicular jasper (likely ocean jasper)

Microcrystalline quartz/chalcedony (SiO₂) with iron oxides and other accessory minerals

Red jasper (polished/tumbled)

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

Polished carnelian

Carnelian, a reddish-orange cryptocrystalline chalcedony (SiO₂), colored mainly by iron oxides.

Tumbled orange-red quartz or carnelian

Microcrystalline quartz, SiO₂; likely carnelian (orange chalcedony), possibly iron-stained quartz

Polished agate (likely moss or plume agate)

Microcrystalline quartz, primarily chalcedony (SiO₂), with possible iron-oxide inclusions

Jasper Pendant

Silicon dioxide (SiO2) with impurities

Banded Agate Coaster

Silicon Dioxide (SiO2) - Variety Agate / Chalcedony

Milky quartz pebble

Quartz (SiO₂), cryptocrystalline to coarse microcrystalline variety

Agate (specifically Waterline or Onyx-type Agate)

Silicon Dioxide (SiO2) - variety Chalcedony

Red Jasper with Quartz

Microcrystalline Quartz (SiO2)