Mineral, Variety Of Chalcedony (Microcrystalline Quartz)

Red Jasper (Skull Carving)

Jasper, a cryptocrystalline variety of Quartz (SiO2)

Tumbled chalcedony (likely mossy or iron-stained agate)

Microcrystalline quartz, SiO₂; chalcedony/agate variety

Blue Lace Agate (Polished Point)

Silicon Dioxide (SiO2) - Variety of Chalcedony

Tumbled quartz-rich stone, likely brown agate or jasper

Microcrystalline silica (chalcedony/quartz, SiO₂), possibly iron-stained agate or jasper

Brown chalcedony (likely carnelian/iron-stained quartz)

Microcrystalline quartz, SiO₂; brown coloration from iron oxides/hydroxides

Tumbled carnelian

Carnelian, orange-red chalcedony (microcrystalline quartz, SiO₂)

Banded Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Chert / Flint Nodule

Microcrystalline quartz (SiO2)

Tumbled jasper (likely brecciated or orbicular jasper)

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

Polished brown jasper pebble

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

Tumbled jasper, likely brecciated or orbicular jasper

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide impurities

Quartz Geode (partially formed/chalcedony with iron staining)

Quartz (SiO2) with Chalcedony (cryptocrystalline quartz) and likely Iron Oxides/Hydroxides

Jasper

Silicon Dioxide (SiO2)

Iron-rich jasper (likely brecciated or orbicular jasper)

Microcrystalline quartz (SiO₂) colored by iron oxides/hydroxides

Tumbled brecciated jasper

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

Polished brown jasper pebble

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

Tumbled yellow-brown jasper

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

Tumbled red jasper

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

Tumbled yellow jasper

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

Carnelian agate (likely)

Cryptocrystalline quartz, SiO₂; orange chalcedony with iron-oxide staining

Tumbled jasper (likely ocean or picture jasper)

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

Tumbled jasper, likely brecciated or brown-green jasper

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

Orange chalcedony (likely carnelian)

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

Tumbled brown chalcedony or jasper pebble

Microcrystalline quartz, SiO₂; possibly iron-rich jasper

Polished agate (likely carnelian/mossy chalcedony)

Chalcedony, microcrystalline quartz (SiO₂), with iron-oxide banding and possible inclusions

Polished jasper (likely brecciated or red jasper)

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide pigments and possible breccia fragments

Tumbled banded agate

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

Polished agate cabochons

Agate, a banded variety of chalcedony (microcrystalline quartz, SiO₂)

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides (Goethite/Limonite)

Jasper River Pebble

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Banded agate (likely carnelian or brown agate)

Banded chalcedony, a microcrystalline variety of quartz (SiO₂)

Yellow Chalcedony (Carnelian / Agate Pebbles)

Silicon Dioxide (SiO2)

Tumbled chalcedony pebble

Chalcedony, microcrystalline quartz (SiO₂)

Polished blue banded agate slice

Chalcedony (microcrystalline quartz), SiO₂, commonly with trace iron and other coloring elements

Blue chalcedony crystal pendant

Chalcedony, microcrystalline quartz (SiO₂), likely blue chalcedony or dyed quartz

Tumbled carnelian or orange chalcedony

Chalcedony, microcrystalline quartz (SiO₂), iron-colored variety

Polished brown jasper (likely ocean jasper or iron-rich jasper)

Microcrystalline quartz, SiO₂, colored by iron oxides and other inclusions

Polished agate/jasper pebble (probable)

Microcrystalline quartz, SiO₂, with iron-oxide and other inclusions

Yellow-brown jasper (likely iron-stained chert)

Microcrystalline quartz (SiO₂), varieties of chalcedony/chert colored by iron oxides

Tumbled orange-brown jasper

Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides

Tumbled brown jasper

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

Tumbled quartz pebble (likely milky quartz or chalcedony)

Quartz, SiO₂; possibly microcrystalline quartz (chalcedony)