Mineral_variety_of_chalcedony

Polished carnelian/chalcedony

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony

Tumbled yellow chalcedony (likely honey agate or yellow quartz)

Microcrystalline quartz, SiO₂; coloration likely from iron oxides or included minerals

Tumbled jasper or chalcedony pebble

Microcrystalline quartz, SiO₂ (likely jasper/chalcedony)

Agate

Chalcedony (SiO2)

Polished banded jasper (likely picture jasper)

Microcrystalline quartz, chiefly SiO₂; jasper with iron-oxide staining

Tumbled chalcedony (likely moss or plume variety)

Microcrystalline quartz, SiO₂

Polished brown-and-cream jasper

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

Jasper with Quartz Vein

Silicon Dioxide (SiO2)

Chalcedony

Silicon Dioxide (SiO2)

Jasper

Chalcedony (Microcrystalline Quartz) - SiO2

Ocean Jasper

Spherulitic Chalcedony (SiO2)

Tumbled dendritic agate (likely)

Chalcedony, microcrystalline SiO₂, with dark manganese/iron-oxide inclusions

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2) with various inclusions

Red jasper

Microcrystalline quartz (SiO₂), commonly colored by iron oxides

Tumbled red-brown stone, likely jasper

Jasper, microcrystalline quartz (SiO₂), probably iron-oxide-bearing chert

Jasper

SiO2 (Silicon Dioxide)

Chalcedony (Agate)

Cryptocrystalline Quartz (SiO2)

Yellow Chalcedony

Silicon Dioxide (SiO2) - Chalcedony

Tumbled jasper (likely ocean or picture jasper)

Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and other mineral impurities

Tumbled jasper, likely red/brown jasper

Microcrystalline quartz (chalcedony), mainly SiO₂, colored by iron oxides

Tumbled carnelian agate

Microcrystalline quartz (chalcedony), SiO₂, colored mainly by iron oxides

Jasper (Green Jasper/Heliotrope variety)

Silicon Dioxide (SiO2)

Jasper

Jasper (Silicon Dioxide, SiO2)

Red Chalcedony (likely dyed)

Chalcedony (a variety of Quartz), SiO2

Tumbled chalcedony (likely carnelian or orange agate)

Microcrystalline quartz, SiO₂; chalcedony variety, possibly Fe-bearing carnelian

Red Jasper

Silicon Dioxide (SiO2) with Iron inclusions

Blue chalcedony crystal pendant

Chalcedony, microcrystalline quartz (SiO₂), likely blue chalcedony or dyed quartz

Carnelian (red-orange chalcedony)

Chalcedony, cryptocrystalline SiO₂; quartz-group mineral

Tumbled orange-and-white chalcedony (likely carnelian or orange agate)

Microcrystalline quartz, SiO₂; chalcedony variety, possibly iron-colored carnelian

Chert (Gray Chalcedony)

Microcrystalline Quartz (SiO2)

Banded Agate

Silicon dioxide (SiO2) - variety of Chalcedony

Polished banded agate (likely petrified wood)

Microcrystalline quartz (SiO₂); possibly silicified wood

Red jasper (likely)

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

Carnelian

Carnelian (Silicon Dioxide, SiO2)

Agate

SiO2 (Silicon dioxide, chalcedony variety)

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Carnelian Agate

Carnelian (Silicon Dioxide: SiO2)

Carnelian (Chalcedony)

Silicon Dioxide (SiO2) - variety of Chalcedony

Blue Chalcedony

Chalcedony (a cryptocrystalline variety of Quartz - SiO₂)

Tumbled orange chalcedony or quartzite

Microcrystalline quartz (SiO₂), possibly iron-stained chalcedony; exact identification requires testing

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Tumbled agate or chalcedony

Microcrystalline quartz (SiO₂), likely brown/orange chalcedony or agate