Mineral (Variety Of Chalcedony)

Tumbled yellow chalcedony (possibly yellow agate)

Microcrystalline quartz, SiO₂; chalcedony variety

Tumbled chalcedony (likely moss or gray agate)

Microcrystalline quartz, SiO₂; chalcedony/agate variety

Geode (Unopened)

Quartz/Chalcedony concretion

Tumbled agate or chalcedony

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

Polished carnelian/chalcedony

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony

Tumbled yellow jasper or chalcedony

Microcrystalline quartz, SiO₂; likely iron-oxide-bearing jasper/chalcedony

Tumbled amber-colored chalcedony or jasper

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

Jasper (Brown / Ironstone Jasper)

Microcrystalline Quartz (SiO2 with iron oxide inclusions)

Tumbled jasper (likely brecciated or iron-stained jasper)

Microcrystalline quartz, SiO₂, colored by iron oxides

Tumbled jasper (likely brecciated jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides

Tumbled brown jasper

Microcrystalline quartz (SiO₂), commonly called jasper when opaque and colored by impurities

Red jasper (likely tumbled)

Microcrystalline quartz, chiefly SiO₂, colored red by iron oxides

Red agate bead pendant

Chalcedony, microcrystalline quartz (SiO₂), likely colored red; exact material cannot be confirmed from the image

Chalcedony (Banded/Mottled Variety)

Chalcedony (a cryptocrystalline variety of Quartz, SiO2)

Polished carnelian jasper / brecciated jasper

Microcrystalline quartz (SiO₂), chalcedony with iron-oxide pigments and opaque jasper fragments

Tumbled agate/chalcedony

Microcrystalline quartz (SiO₂), likely banded chalcedony or agate

Tumbled agate and chalcedony specimens

Microcrystalline quartz (SiO₂), chiefly chalcedony/agate

Tumbled orange chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; iron-bearing variety commonly termed carnelian

Blue Lace Agate

Chalcedony (SiO2)

Tumbled carnelian

Carnelian, an orange variety of chalcedony (microcrystalline quartz, SiO₂)

Tumbled brown stone, likely jasper

Likely microcrystalline quartz (SiO₂), possibly iron-stained jasper; exact identification is uncertain from the photo

Polished banded agate (possibly Botswana agate)

Banded chalcedony, microcrystalline SiO₂

Carnelian cabochon earrings

Carnelian, a translucent orange variety of chalcedony (microcrystalline SiO₂)

Polished agate (likely chalcedony)

Microcrystalline quartz, SiO₂; agate is banded chalcedony

Jasper / Chert (river tumbled)

Microcrystalline Quartz (SiO2)

Polished orbicular jasper (likely ocean jasper)

Silicified microcrystalline quartz (SiO₂), with iron-oxide and other mineral inclusions; exact variety cannot be confirmed from the image

Yellow Chalcedony

Chalcedony (a cryptocrystalline variety of Quartz, SiO₂)

Grape Agate

Chalcedony (SiO2)

Tumbled jasper (likely picture jasper)

Jasper, an opaque microcrystalline variety of quartz (SiO₂); exact variety uncertain from the photo

Jasper and Chalcedony Composite

Silicon Dioxide (SiO2) microcrystalline quartz

Yellow-orange translucent pebble, possibly chalcedony (agate)

Chalcedony, microcrystalline quartz (SiO₂); identification is tentative from the photo

Chrysoprase

Chalcedony (Silicon Dioxide, SiO2)

Jasper

Chalcedony (SiO2)

Brecciated jasper with quartz vein

Jasper (microcrystalline quartz, SiO₂) with quartz/chalcedony cement; brecciated silica-rich rock

Black Onyx

Silicon dioxide (SiO2)

Dalmatian jasper (polished stone beads)

Commercial “Dalmatian jasper”; typically a feldspar-rich rock with dark aegirine or arfvedsonite inclusions, not true jasper

Tumbled chalcedony or agate

Microcrystalline quartz (SiO₂), likely pale agate/chalcedony

Honey-colored chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; orange chalcedony colored by iron oxides

Blue Chalcedony

Silicon Dioxide (SiO2)

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Jasper

Silicon Dioxide (SiO2)

Chalcedony

Silicon Dioxide (SiO2)