Mineral, Variety Of Chalcedony (Microcrystalline Quartz)

Likely tumbled brown agate

Microcrystalline quartz (SiO₂), a variety of chalcedony

Green chalcedony (likely dyed or treated)

Chalcedony, microcrystalline quartz (SiO₂)

Tumbled orange-and-white jasper or brecciated chalcedony

Microcrystalline quartz (SiO₂), likely iron-oxide-stained jasper; exact variety cannot be confirmed from the image

Tumbled carnelian

Carnelian, orange chalcedony (microcrystalline SiO₂)

Gray Agate

Cryptocrystalline Quartz (SiO2)

Ocean Jasper or Orbicular Jasper

SiO2

Yellow jasper (likely iron-rich chert)

Microcrystalline quartz, SiO₂, colored by iron oxides/hydroxides

Tumbled brown jasper

Microcrystalline quartz/chalcedony (SiO₂), iron-oxide colored

Red jasper (likely brecciated jasper)

Microcrystalline quartz, SiO₂, colored mainly by iron oxides

Polished red jasper

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

Chalcedony (Tumbled Agate/Jasper)

Silicon dioxide (SiO2)

Brown chalcedony/agatic jasper nodule

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony with included or weathered host material

Polished brown agate (likely)

Microcrystalline quartz, SiO₂ (chalcedony; agate variety)

Bloodstone

Chalcedony (Variety Heliotrope), SiO2

Bloodstone (Heliotrope)

Cryptocrystalline Quartz (SiO2) with inclusions of Hematite or Chlorite

Red Jasper Concretion

Cryptocrystalline Quartz (SiO2)

Red jasper pebble

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

Tumbled brown jasper

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

Quartz (Chalcedony/Agate)

Silicon Dioxide (SiO2)

Carnelian

Carnelian (Silicon Dioxide, SiO2)

Botryoidal chalcedony (likely quartz with iron staining)

Chalcedony, cryptocrystalline SiO₂; possible quartz druse and limonite/goethite inclusions

Tumbled banded agate beads

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

Dyed Agate

SiO2 (Silicon Dioxide) - Chalcedony variety

Tumbled chalcedony (likely jasper/chert variety)

Microcrystalline quartz, SiO₂ (chalcedony; opaque varieties commonly called jasper or chert)

Weathered agate or chalcedony nodule

Microcrystalline quartz (SiO₂), likely chalcedony/agate

Banded agate (chalcedony)

Microcrystalline quartz (SiO₂), variety chalcedony

Tumbled yellow jasper or chert

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

Agate

Silicon dioxide (SiO2)

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

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

Brown agate (chalcedony)

Microcrystalline quartz, SiO₂; likely iron-stained chalcedony

Jasper

Silicon dioxide (SiO2)

Chalcedony (Tumbled)

Cryptocrystalline Quartz (SiO2)

Tumbled brown chalcedony or jasper

Microcrystalline quartz, SiO₂; possibly iron-bearing jasper

Tumbled jasper or chert

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

Tumbled brown agate

Microcrystalline quartz (SiO₂), variety of chalcedony

Chalcedony with jasper (likely brecciated jasper)

Microcrystalline quartz, SiO₂, with iron-oxide-rich jasper fragments

Polished jasper pebble (possibly orbicular jasper)

Microcrystalline quartz (SiO₂), likely jasper; exact variety cannot be confirmed visually

Tumbled brown chalcedony (likely smoky quartz or agate)

Chalcedony, microcrystalline SiO₂; exact variety cannot be confirmed visually

Jasper

SiO2

Chalcedony (Agate/Carnelian pebbles)

Cryptocrystalline Quartz (SiO2)

Agate (Carnelian Agate with Quartz Matrix)

Silicon Dioxide (SiO2)

Small tumbled quartz pebble, possibly chalcedony

Quartz (SiO₂), likely microcrystalline chalcedony