Mineral (Cryptocrystalline Quartz)

Polished agate slice

Agate, a banded variety of chalcedony (microcrystalline SiO₂)

Polished jasper (likely brecciated or orbicular jasper)

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

Polished brecciated jasper

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

Tumbled orange-and-white chalcedony

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

Polished yellow-brown chalcedony (likely carnelian or mossy/iron-stained agate)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide inclusions

Botryoidal chalcedony (agate/jasper), likely iron-stained

Microcrystalline quartz, SiO₂; chalcedony with possible jasper and goethite/hematite inclusions

Raw carnelian/chalcedony

Microcrystalline quartz (SiO₂), orange chalcedony with iron-oxide coloration

Polished banded jasper

Microcrystalline quartz (SiO₂), commonly with iron-oxide and clay-mineral bands

Polished red jasper

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

Tumbled dendritic agate (likely moss agate)

Microcrystalline quartz, SiO₂, with iron/manganese oxide inclusions

Polished ocean jasper (orbicular jasper)

Microcrystalline quartz (SiO₂), commonly with chalcedony and iron-oxide inclusions

Tumbled yellow-orange chalcedony (likely carnelian or jasper)

Microcrystalline quartz, SiO₂; iron-oxide coloration

Polished chalcedony (likely carnelian or brown agate)

Microcrystalline quartz, SiO₂; chalcedony variety with iron-oxide coloration

Tumbled carnelian (likely agate/chalcedony)

Microcrystalline quartz, SiO₂; reddish color typically from iron oxides

Carnelian Agate

Silicon Dioxide (SiO2) with iron oxide inclusions

Petrified Wood

Silicified Wood (SiO2)

Agate

Silicon Dioxide (SiO2)

Carnelian

Chalcedony (SiO2)

Carnelian (Red Chalcedony)

SiO2 (Silicon Dioxide with Hematite impurities)

Tumbled jasper, likely ocean jasper

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

Polished ocean jasper (orbicular jasper)

Microcrystalline quartz (SiO₂), commonly with chalcedony and iron-rich alteration minerals

Tumbled purple agate (likely grape agate or amethystine chalcedony)

Microcrystalline quartz, SiO₂; purple coloration commonly from iron, manganese, or inclusions

Chert Concretion

Microcrystalline Quartz (SiO2) in Carbonate Matrix

Carnelian (Agate / Chalcedony)

Silicon Dioxide (SiO2) - Iron-stained Chalcedony

Chert (Septarian or Banded Nodular Variety)

Microcrystalline Quartz (SiO2)

Quartz River Pebble with Algae

Silicon Dioxide (SiO2) with organic biofilm

Jasper

Microcrystalline Quartz (SiO2)

Chert Nodule

Microcrystalline Quartz (SiO2)

Jasper and Quartz Breccia

Silicified Breccia / Microcrystalline Quartz

Orange chalcedony (likely carnelian)

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

Polished brecciated jasper

Jasper (microcrystalline quartz, SiO₂), likely iron-oxide-rich breccia

Black Onyx

Silicon Dioxide (SiO2)

Polished brown chalcedony or jasper

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

Polished agate (likely seam or plume agate)

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

Chert / Quartz Pebble

Cryptocrystalline Quartz (SiO2)

Red Jasper (with Quartz)

Silicon Dioxide (SiO2) with Hematite inclusions

Quartz Pebble

Silicon Dioxide (SiO2)

Polished Ocean Jasper beads

Orbicular jasper (microcrystalline quartz, SiO₂), commonly sold as ocean jasper

Chrysocolla-bearing rock (likely chrysocolla in a host rock)

Chrysocolla, hydrated copper aluminosilicate: approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O

Polished orbicular jasper / brecciated jasper bead bracelet

Jasper, microcrystalline quartz (SiO₂), with variable iron oxides and other silicate inclusions

Orbicular jasper (likely ocean jasper)

Silica-rich jasper, predominantly microcrystalline quartz (SiO₂), with iron-oxide and volcanic/mineral inclusions

Green Aventurine

Si O2 (Silicon Dioxide with Fuchsite inclusions)