Mineral_variety_of_chalcedony

Jasper

Chalcedony (SiO2)

Blue Lace Agate

Chalcedony (SiO2)

Chalcedony

Cryptocrystalline Quartz (SiO2)

Chalcedony

Silicon Dioxide (SiO2)

Chalcedony

Silicon Dioxide (SiO2)

Banded agate / chalcedony (likely iron-stained agate)

Microcrystalline quartz, SiO₂; varieties include chalcedony and jasper

Polished jasper pendant

Jasper, an opaque microcrystalline variety of quartz (SiO₂); exact variety cannot be confirmed from the image

Blue Chalcedony

Silicon Dioxide (SiO2)

Tumbled chalcedony or quartz pebble

Microcrystalline quartz, SiO₂ (likely chalcedony; exact identification requires testing)

Tumbled orange chalcedony or carnelian

Microcrystalline quartz (SiO₂), commonly iron-stained chalcedony; likely carnelian

Tumbled jasper (likely brecciated or mahogany jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide inclusions

Tumbled orange chalcedony or carnelian

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony

Polished agate geode slice

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

Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)

Chalcedony (SiO₂)

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron inclusions

Tumbled brown chalcedony (likely smoky quartz or agate)

Chalcedony, microcrystalline SiO₂; exact variety cannot be confirmed visually

Tumbled carnelian/chalcedony

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony

Tumbled agate/chalcedony (likely moss or plume agate)

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

Tumbled amber-brown chalcedony (probable carnelian/ag ate)

Microcrystalline quartz, SiO₂; likely iron-stained chalcedony (carnelian)

Red jasper-like chalcedony pebble

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

Carnelian

Chalcedony (SiO2)

Tumbled carnelian/chalcedony

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

Tumbled brecciated jasper (likely)

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with iron-oxide-rich zones

Tumbled chalcedony (likely milky agate)

Microcrystalline quartz, SiO₂; chalcedony/agate variety

Jasper

Silicon dioxide (SiO2)

Lake Superior Agate

SiO2 (Quartz variety chalcedony)

Brown agate (chalcedony)

Microcrystalline quartz, SiO₂; likely iron-stained chalcedony

Tumbled jasper, likely picture jasper or brecciated jasper

Microcrystalline quartz (SiO₂), chiefly chalcedony with iron-oxide pigments

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Tumbled agate or chalcedony

Microcrystalline quartz (SiO₂), likely agate/chalcedony with green inclusions

Polished orange agate beads

Chalcedony, microcrystalline quartz (SiO₂), commonly sold as agate

Agate (chalcedony), likely a cut nodule

Agate, a banded variety of microcrystalline quartz (SiO₂); associated iron oxides stain the rough outer matrix.

Tumbled jasper

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

Tumbled yellow jasper

Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions

Agate

Cryptocrystalline quartz, SiO2

Tumbled yellow chalcedony (probable)

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

Sardonyx or Carnelian Agate

Silicon Dioxide (SiO2) with iron impurities

Black Onyx

Silicon dioxide (SiO2)

Tumbled brown quartz/chalcedony (probable)

Quartz, SiO₂; possibly brown chalcedony or jasper

Agate (Carnelian / Chalcedony)

Silicon Dioxide (SiO2)

Polished ocean jasper (orbicular jasper), likely a small tumbled stone

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

Polished agate (likely moss or plume agate)

Microcrystalline quartz (SiO₂), chalcedony variety; exact variety is uncertain from the photo