Mineral (Variety Of Chalcedony)

Polished red jasper

Jasper, microcrystalline quartz (SiO₂)

Carnelian

SiO2 (Variety of Chalcedony)

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

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

Blue Chalcedony

Silicon Dioxide (SiO2)

Polished chalcedony with iron-oxide cap (probable carnelian/agate)

Microcrystalline quartz, SiO₂, with hematite/goethite inclusions

Chalcedony (likely common gray chalcedony)

Microcrystalline quartz, SiO₂

Banded Jasper

Silicate Mineral (Microcrystalline Quartz / SiO2)

Tumbled chalcedony (likely carnelian or orange agate)

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

Jasper

Quartz (SiO2) with impurities

Polished brown stone, possibly jasper

Likely iron-rich microcrystalline quartz (SiO₂); exact identification is uncertain from the image

Tumbled orange-brown jasper

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

Brown chalcedony (likely jasper or chert)

Microcrystalline quartz, SiO₂; opaque iron-oxide-rich variety

Tumbled brown jasper (probable)

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

Tumbled quartz-rich chalcedony (likely carnelian or orange jasper)

Microcrystalline quartz, SiO₂, colored mainly by iron oxides

Tumbled chalcedony and agate

Microcrystalline quartz (SiO₂), chiefly chalcedony with possible quartz/agate banding

Polished/tumbled agate or chert

Microcrystalline quartz (SiO₂), likely chalcedony with opaque impurities

Jasper

Microcrystalline Quartz (SiO2)

Tumbled jasper pebble (likely ocean jasper or brecciated jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions

Tumbled carnelian/chalcedony

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

Tumbled amber-colored chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; orange-red variety commonly termed carnelian

Orange chalcedony or jasper fragment

Microcrystalline quartz (SiO₂), likely chalcedony/jasper

Carnelian (Orange Chalcedony)

Silicon Dioxide (SiO2)

Yellow Banded Agate

Silicon Dioxide (SiO₂)

Agate

Silicon Dioxide (SiO2)

Grey Agate (Tumbled)

Silicon Dioxide (SiO2)

Jasper (Chert)

Silicon Dioxide (SiO2)

Yellow chalcedony (likely tumbled quartz)

Chalcedony, cryptocrystalline SiO₂; possibly iron-stained quartz or yellow jasper

Red jasper

Microcrystalline quartz (SiO₂), colored mainly by iron oxides

Tumbled jasper or chalcedony

Microcrystalline quartz, SiO₂; likely opaque jasper with chalcedonic zones

Tumbled jasper or chert

Microcrystalline quartz (SiO₂), likely iron-stained jasper

Tumbled yellow jasper or chert

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

Polished blue-gray agate/geode slice (tentative)

Microcrystalline quartz (chalcedony), SiO₂, possibly with druzy quartz

Jasper

Silicon Dioxide (Quartz variety, SiO2)

Polished yellow chalcedony (likely quartz pebble)

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

Agate in Matrix

Silicon Dioxide (SiO2) within host rock

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Brown Agate

Silicon Dioxide (SiO2)

Gray Agate with Druzy Quartz Geode

Cryptocrystalline Quartz (SiO2)

Red Jasper

Red Jasper (SiO2 with Hematite inclusions)

Dyed Agate

SiO2

Agate (specifically Botswana or Lake Superior style chalcedony)

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions