Mineral (Chalcedony)

Chalcedony Geode / Quartz Druzy

Silicon Dioxide (SiO2)

Polished yellow chalcedony (likely quartz pebble)

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

Polished banded jasper (likely picture jasper)

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

Botryoidal chalcedony (likely blue-gray agate)

Chalcedony, microcrystalline quartz (SiO₂)

Red Jasper

Jasper (Silicate mineral - SiO2)

Agated Chert

Microcrystalline Quartz (SiO2)

Leopard Skin Jasper

Chalcedony (cryptocrystalline quartz) with inclusions

Carnelian

Chalcedony (cryptocrystalline quartz), SiO2

Banded Agate

Cryptocrystalline Quartz (SiO2)

Agate in Rhyolite

Silicon Dioxide (Quartz/Chalcedony) in Volcanic Rock matrix

Small quartz pebble or chalcedony fragment

Silicon dioxide, SiO₂; likely microcrystalline quartz (chalcedony)

Likely translucent quartz/chalcedony fragment

Silicon dioxide (SiO₂), probably microcrystalline quartz or quartz

Pink chalcedony (likely agate/quartz geode fragment)

Microcrystalline quartz, SiO₂; chalcedony with possible iron-oxide inclusions

Blue chalcedony cabochon (probable)

Chalcedony, cryptocrystalline quartz; silicon dioxide (SiO₂)

Tumbled banded agate

Microcrystalline quartz (chalcedony), SiO₂

Chert (specifically Flint or Jasper variant)

Microcrystalline Quartz (SiO2)

Banded Agate

Silicon dioxide (SiO2) - variety of Chalcedony

Polished carnelian (likely brecciated agate) heart

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

Iron-stained quartz fragment (probable quartzite or chert)

Quartz, SiO₂; possibly iron-oxide-stained microcrystalline silica

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)

Polished brown agate (likely)

Microcrystalline quartz, SiO₂ (chalcedony; agate variety)

Black Onyx

Silicon dioxide / Chalcedony (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Iron inclusions

Quartz-rich rock, possibly chrysoprase/chalcedony

Microcrystalline quartz (SiO₂), with iron-oxide staining and green inclusions; exact identification requires testing

Polished brecciated jasper pebble

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with contrasting mineral-filled fractures

Chalcedony with inclusions (Agate/Quartz)

Silicon Dioxide (SiO2)

Brecciated Red Jasper

Microcrystalline Quartz (Chalcedony), SiO2

Blue chalcedony or dyed agate (tentative)

Microcrystalline quartz, SiO₂; color may be enhanced by dye or coating

Tumbled dark reddish-brown stone, possibly red jasper

Jasper, microcrystalline quartz (SiO₂), likely iron-oxide colored

Tumbled brecciated jasper

Silica-rich microcrystalline quartz/chalcedony (SiO₂), with iron-oxide and other mineral inclusions

Polished banded agate

Chalcedony (microcrystalline quartz), SiO₂

Blue agate (likely dyed and polished)

Microcrystalline quartz, SiO₂ (chalcedony); blue color may be dye

Polished yellow chalcedony pendant (possibly yellow agate)

Microcrystalline quartz, SiO₂; chalcedony variety

Tumbled chalcedony or agate

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

Agate

Silicon dioxide (SiO2)

Dyed Blue Agate Geode Slice

Chalcedony (Silicon Dioxide, SiO2)

Blue calcite (likely)

Calcite, calcium carbonate (CaCO₃)

Bloodstone (Heliotrope)

Cryptocrystalline Quartz (SiO2) with inclusions of Hematite or Chlorite

Green Moss Agate

Agate (Silicon Dioxide - SiO2 with inclusions of Manganese/Iron oxides)