Mineral (Chalcedony

Brown chalcedony (possibly carnelian)

Microcrystalline quartz, SiO₂; carnelian is orange-red 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

Tumbled orange-brown stone, likely carnelian or iron-stained chalcedony

Chalcedony (microcrystalline SiO₂), possibly iron-oxide-colored carnelian

Tumbled chalcedony (likely agate)

Chalcedony, microcrystalline quartz (SiO₂); banding is not clearly visible to confirm agate

Sphalerite in Chalcedony (Crescent Carving)

Zinc Sulfide (ZnS) with Silicon Dioxide (SiO2)

Polished agate with possible iron-oxide inclusions

Microcrystalline quartz (chalcedony), SiO₂; inclusions appear to be iron oxides, possibly goethite or hematite

Polished agate or chalcedony pebble

Microcrystalline quartz (SiO₂), likely agate/chalcedony

Tumbled brown agate or jasper

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

Tumbled brown chalcedony (likely agate)

Microcrystalline quartz, SiO₂; agate is banded chalcedony

Polished gray chalcedony (likely agate)

Microcrystalline quartz, SiO₂; chalcedony, possibly banded agate

Tumbled orange-brown chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; carnelian is iron-colored chalcedony

Chalcedony (Agate)

Chalcedony (Cryptocrystalline Quartz, SiO2)

Polished blue chalcedony (possibly agate)

Microcrystalline quartz, SiO₂; chalcedony, potentially banded agate

Gray chalcedony (possibly agate)

Microcrystalline quartz, SiO₂

Tumbled yellow-orange chalcedony (likely carnelian)

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

Chalcedony nodule (likely agate)

Microcrystalline quartz, SiO₂; banded varieties are agate

Botryoidal Chalcedony

Silicon Dioxide (SiO2)

Tumbled honey-brown chalcedony (likely agate)

Microcrystalline quartz, SiO₂; chalcedony, possibly iron-stained agate

Flower Agate

Silicon Dioxide (SiO2) with Chalcedony inclusions

Chalcedony (Agate/Carnelian variant)

Silicon Dioxide (SiO2)

Tumbled pale-yellow chalcedony (possibly yellow jasper)

Microcrystalline quartz, SiO₂; chalcedony/jasper varieties

Yellow-orange translucent pebble, possibly chalcedony (agate)

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

Chalcedony (likely yellow agate or jasper fragment)

Microcrystalline quartz, SiO₂

Orange-pink chalcedony (likely carnelian/chalcedony rough)

Microcrystalline quartz, SiO₂; iron-oxide-bearing chalcedony

Chalcedony (Agate / Chert)

Silicon Dioxide (SiO2)

Tumbled jasper or chert

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

Chalcedony

Chalcedony (SiO2)

Possible rough agate/chalcedony nodule

Microcrystalline quartz (SiO₂), likely chalcedony or agate

White Chalcedony (likely Common Opal or Milky Quartz)

Silicon Dioxide (SiO2)

Tumbled blue chalcedony or dyed quartz

Microcrystalline quartz, SiO₂ (likely dyed chalcedony)

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

Tumbled yellow chalcedony (likely yellow agate)

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