Mineral (Chalcedony

Dyed Agate

Silicon dioxide, SiO2

Chalcedony (possibly agate or common quartz)

Microcrystalline quartz, SiO₂

Carnelian

Carnelian (SiO2 with Iron oxide impurities)

Likely tumbled quartz/chalcedony pebble

Quartz (SiO₂), possibly microcrystalline chalcedony

Jasper-Agate

Silicon Dioxide (SiO2)

Agate Nodule (Chalcedony)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Agate (Dyed Blue)

SiO2 (Silicon Dioxide)

Geode Nodule Fragment

Quartz / Chalcedony Nodule

Sphalerite in Chalcedony (Crescent Carving)

Zinc Sulfide (ZnS) with Silicon Dioxide (SiO2)

Tumbled brown agate or jasper

Microcrystalline quartz, SiO₂ (likely chalcedony/agate with iron oxides)

Botryoidal Chalcedony

Silicon Dioxide (SiO2)

Chalcedony (Agate)

Chalcedony (Cryptocrystalline Quartz, SiO2)

Tumbled yellow-orange chalcedony (likely carnelian)

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

Tumbled pale-yellow chalcedony (possibly yellow jasper)

Microcrystalline quartz, SiO₂; chalcedony/jasper varieties

Flower Agate

Silicon Dioxide (SiO2) with Chalcedony inclusions

Chalcedony (Agate/Carnelian variant)

Silicon Dioxide (SiO2)

Orange-pink chalcedony (likely carnelian/chalcedony rough)

Microcrystalline quartz, SiO₂; iron-oxide-bearing chalcedony

Chalcedony (likely yellow agate or jasper fragment)

Microcrystalline quartz, SiO₂

Tumbled jasper or chert

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

Chalcedony (Agate / Chert)

Silicon Dioxide (SiO2)

Chalcedony

Chalcedony (SiO2)

Possible rough agate/chalcedony nodule

Microcrystalline quartz (SiO₂), likely chalcedony or agate

Tumbled blue chalcedony or dyed quartz

Microcrystalline quartz, SiO₂ (likely dyed chalcedony)

White Chalcedony (likely Common Opal or Milky Quartz)

Silicon Dioxide (SiO2)

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Tumbled yellow chalcedony (likely yellow agate)

Chalcedony, microcrystalline quartz (SiO₂); possibly iron-stained agate

Chalcedony (Tumbled)

Cryptocrystalline Quartz (SiO2)

Chalcedony (Agate/Common Opal blend)

Microcrystalline Quartz (SiO2)

Chalcedony (Quartz Var.)

Silicon Dioxide (SiO2)

Red Jasper or Iron-stained Quartz

SiO2 with Fe impurities

Polished agate geode slice

Agate, a banded variety of microcrystalline quartz (SiO₂); likely quartz/chalcedony lining a geode

Blue Chalcedony

Silicon Dioxide (SiO2)

Flower Agate (Plume Agate)

Chalcedony (Silicon Dioxide) with Spherulitic Inclusions - SiO2

Botryoidal Chalcedony (Agate/Chert Nodule)

Chalcedony (SiO2)

Chalcedony

Chalcedony (SiO2)

Chalcedony (Agate/Carnelian)

Cryptocrystalline Silicon Dioxide (SiO2)

Tumbled yellow-orange chalcedony (likely carnelian or honey agate)

Microcrystalline quartz, SiO₂; orange coloration commonly from iron oxides

Yellow Chalcedony

Chalcedony (a cryptocrystalline variety of Quartz, SiO₂)

Tumbled orange-and-white chalcedony

Chalcedony, microcrystalline quartz (SiO₂), likely orange carnelian/white agate variety

Chalcedony (Agate/Carnelian)

Silicon Dioxide (SiO2)

Tumbled pink chalcedony (likely pink agate)

Chalcedony, microcrystalline SiO₂; variety of quartz

Tumbled chalcedony (likely orange agate/carnelian)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration