Mineral, Variety Of Chalcedony (Microcrystalline Quartz)

Polished yellow chalcedony (likely quartz pebble)

Chalcedony, microcrystalline quartz (SiO₂), possibly iron-stained jasper

Fancy Jasper

Silicon Dioxide (SiO2) with mineral inclusions

Tumbled jasper

Microcrystalline quartz (SiO₂), commonly iron-rich jasper

Agate (Carnelian-Blue Agate mix)

Silicon Dioxide (SiO2)

Yellow Chalcedony (Tumbled/Cabochon)

Silicon dioxide (SiO2)

Red Jasper (Chalcedony)

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Jasper

Quartz (Silicon Dioxide) with Hematite inclusions, SiO2

Chalcedony (likely agate/chert variety)

Microcrystalline quartz, SiO₂

Tumbled Red Jasper

Quartz (Microcrystalline variety of chalcedony, SiO2)

Tumbled amber-colored chalcedony or jasper

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

Blue chalcedony (likely common blue agate)

Microcrystalline quartz, SiO₂; chalcedony variety

Quartz Geode (partially formed/chalcedony with iron staining)

Quartz (SiO2) with Chalcedony (cryptocrystalline quartz) and likely Iron Oxides/Hydroxides

Chalcedony on Matrix (Botryoidal Agate)

Silicon Dioxide (SiO2)

Blue-dyed banded agate

Microcrystalline quartz (SiO₂), chalcedony variety

Banded Agate (Tumbled)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chalcedony (Agate / Moss Agate)

Silicon Dioxide (SiO2)

Chert

Microcrystalline quartz (SiO2)

Agate

Silicon Dioxide (SiO2)

Likely tumbled quartz/chalcedony

Quartz (SiO₂), possibly milky quartz or pale chalcedony

Blue lace agate (tumbled)

Microcrystalline quartz, SiO₂ (chalcedony variety)

Orbicular Jasper (Ocean Jasper tendency)

Silicon Dioxide (SiO2) with impurities

Jasper with Quartz Vein

Microcrystalline quartz (SiO2) and chalcedony with a quartz vein

Agate (Chalcedony)

Agate (Silicon Dioxide - SiO2)

Yellow Jasper

Silicon Dioxide with Limonite/Goethite inclusions (SiO2)

Jasper

Jasper (Silica/Quartz) - SiO2

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Red jasper

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

Moss Agate

Chalcedony (SiO2) with inclusions of manganese or iron oxide

Jasper with Quartz

Silicon Dioxide (SiO2) - Chalcedony variety

Tumbled jasper (likely picture jasper or iron-rich jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides

Red Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Jasper

Silicon dioxide (Quartz variety), SiO2

Chalcedony

Silicon Dioxide (SiO2)

Tumbled brown jasper (likely iron-rich chalcedony)

Jasper, opaque microcrystalline quartz (SiO₂), commonly colored by iron oxides

Chalcedony (Yellow/Honey variety)

Microcrystalline Quartz (SiO2)

Polished blue banded agate slice

Chalcedony (microcrystalline quartz), SiO₂, commonly with trace iron and other coloring elements

Tumbled Chalcedony

Quartz (Silicon Dioxide - SiO2)

Onyx

Onyx (a variety of Chalcedony, SiO₂)

Tumbled yellow-brown jasper

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

Tumbled red jasper

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

Agate

Chalcedony (cryptocrystalline variety of Quartz, SiO2)

Carnelian

Silicon Dioxide (Chalcedony variety), SiO2