Mineral, Variety Of Chalcedony (Microcrystalline Quartz)

Brown chalcedony (likely carnelian or agate fragment)

Microcrystalline quartz, SiO₂; iron-oxide-colored chalcedony

Tumbled carnelian (orange chalcedony)

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

Quartz (Agate/Chalcedony variety)

Silicon Dioxide (SiO2)

Polished banded agate

Microcrystalline quartz (chalcedony), SiO₂

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Limonite inclusions

Tumbled red jasper

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

Tumbled jasper or iron-rich chert

Microcrystalline quartz (SiO₂), likely with iron-oxide inclusions

Tumbled yellow jasper

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

Banded jasper (likely mookaite or brecciated jasper)

Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and clay inclusions

Polished/tumbled jasper or chert pebble

Microcrystalline quartz (SiO₂), likely ferruginous jasper/chert

Polished yellow chalcedony (likely quartz pebble)

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

Agate (Sliced Nodule)

Silicon Dioxide (SiO2) - Chalcedony variety

Yellow Chalcedony (Agate)

Silicon Dioxide (SiO2)

Chalcedony (Botryoidal Agate vein)

Chalcedony (Microcrystalline Quartz) - SiO2

Tumbled Purple Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Carnelian Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

Tumbled carnelian/chalcedony

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

Tumbled gray chalcedony (likely agate or quartzite)

Microcrystalline quartz, SiO₂ (chalcedony)

Black Onyx

Chalcedony (Silicon Dioxide, SiO2)

Agate

Silicon Dioxide (SiO2)

Jasper with Quartz Vein

Microcrystalline quartz (SiO2) and chalcedony with a quartz vein

Green chalcedony (possibly chrysoprase) cabochon

Chalcedony, microcrystalline quartz (SiO₂); chrysoprase is nickel-colored chalcedony

Yellow Chalcedony (Tumbled/Cabochon)

Silicon dioxide (SiO2)

Red jasper (likely iron-stained chert)

Microcrystalline quartz, SiO₂, colored chiefly by iron oxides; identification is provisional from the photo

Red jasper pebble

Jasper, microcrystalline quartz (SiO₂) colored by iron oxides

Tumbled yellow jasper

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

Yellow Jasper

Silica (Silicon Dioxide, SiO2) with iron inclusions

Banded Agate

Silicon dioxide (SiO2) - variety of Chalcedony

Red jasper

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

Orbicular Jasper (Ocean Jasper tendency)

Silicon Dioxide (SiO2) with impurities

Polished agate/jasper pebble

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

Tumbled brown jasper

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

Banded Agate (Tumbled)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Polished brown jasper pebble

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

Carnelian

SiO2 (Quartz variety)

White Agate (Chalcedony)

Chalcedony (SiO2)

Polished tiger-eye jasper / iron-rich jasper

Quartz-rich jasper (microcrystalline SiO₂) with iron oxides, likely hematite/goethite and magnetite

Leopard Skin Jasper

Chalcedony (cryptocrystalline Quartz)

Tumbled carnelian or orange chalcedony

Chalcedony (microcrystalline quartz), SiO₂; likely iron-stained variety

Likely quartz-rich stone, possibly milky quartz or chalcedony

Quartz (SiO₂), possibly microcrystalline chalcedony

Tumbled jasper

Microcrystalline quartz (chalcedony), chiefly SiO₂, colored by iron oxides and other impurities

Tumbled orbicular jasper (likely ocean jasper)

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