Mineral, Variety Of Chalcedony (Microcrystalline Quartz)

Tumbled blue-green stone, likely dyed agate

Agate (microcrystalline quartz, SiO₂); blue coloration may be artificial

Polished red jasper

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

Polished banded jasper (likely red jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides; exact variety uncertain

Polished yellow-brown agate (likely carnelian or chalcedony)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

Polished red jasper and carnelian-like stones

Jasper: microcrystalline quartz (SiO₂), commonly colored by iron oxides; translucent piece may be carnelian, a chalcedony variety

Dyed agate slice

Microcrystalline quartz (SiO₂), typically banded chalcedony

Small rough jasper and agate specimens (identification tentative)

Microcrystalline quartz: chalcedony, SiO₂; opaque varieties are commonly called jasper, while translucent or banded varieties are agate.

Jasper

Silicon dioxide, SiO2

Chalcedony on Matrix

Silicon Dioxide (SiO2)

Jasper (likely brecciated jasper)

Microcrystalline quartz/chalcedony (SiO₂), with possible iron-oxide coloring

Tumbled jasper or chert

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

Red jasper pebble

Microcrystalline quartz (SiO₂), colored by iron oxides; possibly brecciated jasper

Tumbled jasper, likely mookaite or brecciated jasper

Microcrystalline quartz (SiO₂), with iron-oxide inclusions

Tumbled red jasper (probable)

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

Botryoidal chalcedony (likely agate/jasper variety)

Microcrystalline quartz, SiO₂

Chalcedony (Botryoidal/Agate nodule)

Microcrystalline Quartz (SiO2)

Polished yellow chalcedony pendant (possibly yellow agate)

Microcrystalline quartz, SiO₂; chalcedony variety

Polished agate pebble (likely dyed or naturally banded chalcedony)

Chalcedony, microcrystalline SiO₂; agate is banded chalcedony

Tumbled chalcedony or agate

Microcrystalline quartz (SiO₂), likely pale agate/chalcedony

Tumbled brown jasper (likely orbicular or brecciated jasper)

Jasper, microcrystalline quartz/chalcedony; SiO₂

Jasper

Silicon dioxide (SiO2)

Likely rough carnelian (orange-brown chalcedony)

Chalcedony, microcrystalline quartz (SiO₂); variety possibly carnelian

Tumbled jasper (likely brecciated or mahogany jasper)

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

Weathered jasper/chert nodule

Microcrystalline quartz (SiO₂), likely iron- and clay-stained jasper or chert

Tumbled brown agate (probable)

Microcrystalline quartz, SiO₂ (chalcedony/agate)

Red Jasper Pebble

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Blue lace agate (likely dyed or color-enhanced)

Microcrystalline quartz (chalcedony), SiO₂

Banded Agate

Silicon Dioxide (SiO2) - Chalcedony Variety

Agate

Silicon dioxide (SiO2) - variety Chalcedony

Blue Lace Agate

Cryptocrystalline variety of Quartz (SiO2)

Tumbled brown agate (possible carnelian or chalcedony)

Microcrystalline quartz, SiO₂; agate is banded chalcedony

Tumbled brown chalcedony/jasper

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

Tumbled brown jasper

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

Carnelian

Carnelian (Silicon Dioxide - SiO2)

Agate Geode

Silicon Dioxide (SiO2) - Chalcedony variety

Jasper or Agatized material

Microcrystalline Quartz (SiO2)

Likely tumbled jasper or agate

Microcrystalline quartz (SiO₂), possibly iron-rich jasper

Lake Superior Agate

Silicon Dioxide (Chalcedony variety)

Polished agate (likely moss or plume agate)

Microcrystalline quartz, SiO₂ (chalcedony)

Tumbled green agate (likely moss or chalcedony agate)

Cryptocrystalline quartz, SiO₂; likely green chalcedony with possible chlorite or iron inclusions

Tumbled jasper (likely brown/yellow jasper)

Microcrystalline quartz, SiO₂, typically with iron-oxide and clay impurities

Tumbled jasper or weathered chert

Microcrystalline quartz (SiO₂), likely jasper/chert with iron-oxide impurities