Mineral (Chalcedony)

Agate Geode

Silicon dioxide (SiO2) - Chalcedony

Ocean Jasper

Silicon dioxide with impurities (SiO2 + impurities)

Tumbled chalcedony (likely agate or jasper fragment)

Microcrystalline quartz, SiO₂ (chalcedony)

Weathered quartz-rich stone, possibly chalcedony or calcite

Likely microcrystalline quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Agate Geode

Cryptocrystalline Quartz (SiO2) with Chalcedony banding

Banded Agate (Onyx type)

Silicon dioxide (SiO2)

Dragon Blood Jasper

Epidote with Red Jasper (SiO2 + Ca2(Al,Fe)3(SiO4)3(OH))

Bloodstone

Heliotrope

Ocean Jasper

SiO2, highly silicified rhyolite or spherulitic chalcedony

Polished ocean jasper

Silicified rhyolite/chalcedony aggregate (primarily microcrystalline SiO₂)

Polished ocean jasper tower

Orbicular chalcedony (microcrystalline quartz, SiO₂), commonly sold as ocean jasper

Black Onyx

Chalcedony (SiO2) with parallel banding

Botryoidal chalcedony (likely blue-gray agate)

Chalcedony, microcrystalline quartz (SiO₂), commonly with iron-oxide staining

Carnelian (orange chalcedony)

Microcrystalline quartz, SiO₂; chalcedony colored mainly by iron oxides

Dendritic agate (moss agate-like chalcedony)

Microcrystalline quartz, SiO₂, with manganese/iron-oxide dendrites

Honey-yellow chalcedony (likely common opal or silicified material)

Microcrystalline quartz, SiO₂; possibly hydrated silica opal, SiO₂·nH₂O

Ocean Jasper

Orbicular Jasper / Chalcedony (SiO2)

Tumbled jasper pebble (likely ocean jasper or brecciated jasper)

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

Possible quartz-rich pebble or chalcedony

Quartz (SiO₂), possibly microcrystalline chalcedony

Botryoidal chalcedony (white agate)

Microcrystalline quartz, SiO₂ (chalcedony)

Blue chalcedony crystal pendant

Chalcedony, microcrystalline quartz (SiO₂), likely blue chalcedony or dyed quartz

Polished red jasper

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

Iron-stained jasper (likely rough jasper)

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

Jasper (likely brecciated jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides

Polished brecciated jasper

Silica-rich microcrystalline quartz/chalcedony (SiO₂), with iron-oxide staining and angular mineral fragments

Tumbled banded agate (likely carnelian or sardonyx)

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

Tumbled brown jasper

Microcrystalline quartz (SiO₂), commonly with iron-oxide impurities

Jasper with Iron Oxides

Silicon Dioxide (SiO2) with Fe2O3 inclusions

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Polished chalcedony (likely moss or dendritic agate)

Microcrystalline quartz, SiO₂, with iron/manganese oxide inclusions

Small orange-red tumbled gemstones, likely carnelian

Carnelian, a microcrystalline variety of quartz (SiO₂), typically colored by iron oxides

Jasper

Jasper (Silicon Dioxide, SiO2)

Red Jasper (Chert)

Silicon Dioxide (SiO2) with iron inclusions

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Polished dendritic agate (likely moss or plume agate)

Microcrystalline quartz, SiO₂, with iron-oxide inclusions

Tumbled dendritic jasper

Cryptocrystalline quartz (chalcedony), SiO₂, with manganese/iron-oxide dendrites

Tumbled blue-gray chalcedony (likely blue agate)

Chalcedony, microcrystalline quartz (SiO₂)

Agate / Chalcedony Geode

Silicon Dioxide (SiO2)

Tumbled brown chalcedony or jasper

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

Tumbled orange chalcedony (likely carnelian)

Cryptocrystalline quartz, SiO₂; orange variety commonly called carnelian

Tumbled carnelian (orange chalcedony)

Carnelian, a microcrystalline variety of quartz; silicon dioxide (SiO₂) colored mainly by iron oxides

Polished banded agate (likely Botswana agate)

Banded chalcedony, microcrystalline quartz (SiO₂)