Mineral (Variety Of Chalcedony)

Chalcedony

Silicon Dioxide (SiO2)

Jasper and Quartz

Silicon Dioxide (SiO2)

Bloodstone

Chalcedony (Variety Heliotrope)

Agate

Chalcedony (SiO2)

Likely tumbled orange carnelian

Carnelian, orange chalcedony (microcrystalline quartz, SiO₂)

Polished banded agate (likely carnelian agate)

Microcrystalline quartz, SiO₂ (chalcedony); iron-oxide coloring

Small agate or chalcedony fragment

Microcrystalline quartz (SiO₂), likely banded chalcedony/agate

Polished carnelian agate

Microcrystalline quartz (SiO₂), chalcedony variety; orange-red color commonly from iron oxides

Polished black-and-brown agate pebble

Microcrystalline quartz (SiO₂), likely chalcedony/agate

Polished banded agate

Microcrystalline quartz (SiO₂), chiefly chalcedony

Tumbled orange carnelian

Carnelian, orange chalcedony (microcrystalline SiO₂)

Polished carnelian (red-orange chalcedony)

Chalcedony, microcrystalline quartz (SiO₂), colored by iron oxides

Polished agate slice

Microcrystalline quartz (SiO₂), chiefly chalcedony

Tumbled carnelian (reddish-orange chalcedony)

Chalcedony, microcrystalline quartz (SiO₂), colored by iron oxides

Banded jasper pebble

Microcrystalline quartz (SiO₂), iron-oxide colored; likely jasper/chert

Tumbled carnelian (reddish chalcedony)

Chalcedony, microcrystalline quartz (SiO₂), colored by iron oxides

Polished banded jasper (likely red jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides; exact variety uncertain

Tumbled brown jasper

Microcrystalline quartz (chalcedony), SiO₂; likely jasper

Quartz Vein in Jasper

Silicon dioxide (SiO2)

Banded Calcite (Mexican Onyx)

Calcium Carbonate (CaCO3)

Tumbled/rounded agate (likely mossy or brecciated chalcedony)

Microcrystalline quartz, SiO₂ (chalcedony/agate)

Agate (Puddingstone style)

Silicon Dioxide (SiO2) with impurities

Tumbled chalcedony (likely agate)

Microcrystalline quartz, SiO₂; chalcedony, possibly banded agate

Polished brecciated jasper (likely)

Microcrystalline quartz, SiO₂, with iron-oxide-rich brown fragments and pale silica

Red Jasper

Silicon Dioxide (SiO2) - variety Jasper

Tumbled chalcedony/agate (likely iron-stained quartz)

Microcrystalline quartz, SiO₂; chalcedony with possible agate banding and iron-oxide inclusions

Tumbled jasper or chert

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

Chalcedony

Silicon Dioxide (SiO2)

Agate Slab

Chalcedony (SiO2)

Tumbled agate

Microcrystalline quartz (SiO₂), likely agate or chalcedony

Chalcedony

Silicon dioxide (SiO2)

Tumbled brown chalcedony (likely carnelian/agatesque material)

Microcrystalline quartz, SiO₂; chalcedony variety

Chalcedony

Silicon Dioxide (SiO2)

Chalcedony

Chalcedony (a microcrystalline variety of Quartz, SiO2)

Polished orbicular jasper (likely ocean jasper)

Silica-rich microcrystalline quartz/chalcedony, SiO₂; precise variety uncertain from the photo

Tumbled Black Stone

Unknown, possibly Obsidian, Onyx, or Tourmaline

Tumbled red jasper

Jasper, an opaque, microcrystalline variety of quartz (SiO₂)

Polished banded agate (possibly carnelian agate)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide-colored bands

Banded agate (likely moss or plume agate)

Microcrystalline quartz (SiO₂), chiefly chalcedony

Polished agate/geode slab

Banded chalcedony (microcrystalline quartz, SiO₂), likely with quartz crystals

Tumbled blue-green stone, likely dyed agate

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

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions