Mineral (Chalcedony Variety)

Blue Agate

Chalcedony (SiO2)

Dyed Dragon Vein Agate

Silicon Dioxide (SiO2) with artificial pigment

Blue Lace Agate

Cryptocrystalline Quartz (SiO2) with trace minerals

Tumbled chalcedony (likely agate or jasper)

Microcrystalline quartz, SiO₂ (chalcedony)

Blue Chalcedony

Silicon Dioxide (SiO2)

Polished agate/jasper nodule

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide impurities

Jasper (likely brecciated jasper)

Microcrystalline quartz, SiO₂, colored by iron oxides

Black onyx-style bead bracelet

Likely polished black chalcedony (microcrystalline quartz, SiO₂); the beads may also be dyed agate or another black stone.

Polished carnelian agate

Microcrystalline quartz, SiO₂, commonly chalcedony with iron-oxide coloring

Tumbled carnelian (orange chalcedony)

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

Raw carnelian/chalcedony

Microcrystalline quartz (SiO₂), orange chalcedony with iron-oxide coloration

Polished agate (likely moss or plume agate)

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

Tumbled Agate

Silicon Dioxide (SiO2)

Tumbled quartz-rich stone, likely brown agate or jasper

Microcrystalline silica (chalcedony/quartz, SiO₂), possibly iron-stained agate or jasper

Tumbled brown jasper (likely common jasper or chert)

Microcrystalline quartz, SiO₂, chiefly chalcedony/quartz with iron-oxide impurities

Chalcedony (Agate/Carnelian pebbles)

Cryptocrystalline Quartz (SiO2)

Agate

Silicon dioxide (SiO2)

Quartz (Agate/Chalcedony)

Silicon Dioxide (SiO2)

Agate (Carnelian-Blue Agate mix)

Silicon Dioxide (SiO2)

Agate (Chalcedony Variation)

Silicon Dioxide (SiO2)

Jasper Pendant

Silicon dioxide (SiO2) with impurities

Red Jasper Pebble

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Tumbled chalcedony (likely mossy/inclusion-rich variety)

Chalcedony, microcrystalline quartz (SiO₂)

Blue Lace Agate

Microcrystalline Quartz (Chalcedony), SiO2

Likely tumbled brown agate

Microcrystalline quartz (SiO₂), a variety of chalcedony

Jasper

Silicon dioxide (SiO2)

Blue-green agate bead bracelet

Chalcedony (microcrystalline quartz, SiO₂), likely dyed blue-green

Orange chalcedony (likely carnelian)

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

Tumbled brown agate

Chalcedony (microcrystalline quartz), SiO₂, with iron-oxide coloration

Red jasper

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

Agate

SiO2

Yellow jasper (likely iron-stained chert or quartzite)

Microcrystalline quartz, SiO₂, colored by iron oxides/hydroxides

Tumbled jasper, likely red jasper

Microcrystalline quartz (SiO₂), chalcedony variety with iron-oxide impurities

Gray chalcedony (microcrystalline quartz)

Chalcedony, SiO₂; likely common gray/blue-gray variety

Tumbled Agate

Silicon Dioxide (SiO2)

Carnelian

Carnelian (SiO2 with iron oxide impurities)

Red Jasper

Silicon dioxide with hematite impurities (SiO2 + Fe2O3)

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide impurities), SiO2

Banded Agate (Gray/Brown)

Silicon Dioxide (SiO2)

Carnelian

Carnelian (SiO2 with Iron Oxide impurities)

Agate

Silicon dioxide (SiO2)

Red Jasper

Jasper (Silicon Dioxide, SiO2)