Mineral, Variety Of Chalcedony (Microcrystalline Quartz)

Tumbled translucent quartz or chalcedony fragment

Silicon dioxide, SiO₂; likely quartz/chalcedony

Jasper with Quartz

Silicon dioxide (SiO2)

Polished brown jasper

Jasper, microcrystalline quartz (SiO₂), commonly containing iron-oxide and clay inclusions

Tumbled orange carnelian (likely)

Chalcedony, microcrystalline quartz (SiO₂)

Tumbled chalcedony (likely moss or plume variety)

Microcrystalline quartz, SiO₂

Agate

SiO2

Yellow jasper (likely iron-stained chert or quartzite)

Microcrystalline quartz, SiO₂, colored by iron oxides/hydroxides

Tumbled agate and chalcedony specimens

Microcrystalline quartz (SiO₂), chiefly chalcedony/agate

Red Jasper

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

Agate

SiO2 (Silicon dioxide, cryptocrystalline quartz)

Polished brecciated jasper pebble

Microcrystalline quartz (SiO₂), with iron-oxide inclusions

Polished honey/brown agate (likely carnelian chalcedony)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

Blue chalcedony (likely dyed or coated)

Microcrystalline quartz, SiO₂ (chalcedony)

Tumbled blue chalcedony

Chalcedony, microcrystalline quartz (SiO₂)

Polished red jasper

Jasper, microcrystalline quartz (SiO₂)

Polished agate/geode slab

Banded chalcedony (microcrystalline quartz, SiO₂), likely with quartz crystals

Tumbled brown agate (likely carnelian/chalcedony)

Microcrystalline quartz, SiO₂; chalcedony, possibly iron-stained

Jasper

Chalcedony (Microcrystalline Quartz) - SiO2

Chalcedony (likely brown agate or flint)

Microcrystalline quartz, SiO₂; chalcedony, possibly iron-stained

Chalcedony (Quartz Pebbles)

Silicon Dioxide (SiO2)

Tumbled pale agate or chalcedony

Microcrystalline quartz (SiO₂), likely agate/chalcedony

Blue-gray chalcedony (likely agate/jasper fragment)

Microcrystalline quartz, SiO₂ (chalcedony)

Tumbled chalcedony (likely orange agate/carnelian)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

Tumbled blue chalcedony (possibly blue agate)

Microcrystalline quartz, SiO₂; chalcedony variety

Tumbled brown jasper

Microcrystalline quartz (chalcedony), SiO₂; likely jasper

Brown chalcedony (possibly carnelian)

Microcrystalline quartz, SiO₂; carnelian is orange-red chalcedony

Chalcedony

Silicon dioxide (SiO2) - Microcrystalline quartz

Tumbled chalcedony (likely moss or dendritic agate)

Microcrystalline quartz, SiO₂, with iron-oxide inclusions

Tumbled brown jasper

Microcrystalline quartz/chalcedony (SiO₂), commonly iron-stained

Tumbled agate or chalcedony (probable)

Microcrystalline quartz, SiO₂

Iron-stained chalcedony or jasper

Microcrystalline quartz (SiO₂), likely ferruginous jasper/chalcedony

Tumbled banded agate

Microcrystalline quartz (chalcedony), SiO₂

Polished brecciated jasper

Jasper, microcrystalline quartz (SiO₂), with iron-oxide and pale silica-rich fragments

Jasper (likely brecciated jasper)

Microcrystalline quartz, SiO₂; iron-oxide-stained chalcedony

Jasper and Chalcedony Composite

Silicon Dioxide (SiO2) microcrystalline quartz

Blue Chalcedony

Cryptocrystalline Quartz (SiO2)

Tumbled brown jasper (probable)

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

Orange chalcedony or jasper fragment

Microcrystalline quartz (SiO₂), likely chalcedony/jasper

Carnelian (Orange Chalcedony)

Silicon Dioxide (SiO2)

Chalcedony (likely common gray chalcedony)

Microcrystalline quartz, SiO₂

Polished banded agate

Microcrystalline quartz (chalcedony), SiO₂

Chert or chalcedony fragment

Microcrystalline quartz (SiO₂), likely ferruginous chalcedony/jasper