Mineral_variety_of_chalcedony

Tumbled blue chalcedony/agate (likely glassy silica material)

Microcrystalline quartz, SiO₂; possibly blue chalcedony or dyed agate

Carnelian (orange chalcedony)

Microcrystalline quartz, SiO₂; chalcedony colored mainly by iron oxides

Jasper or Agate Nodule

SiO2

Polished brown agate (likely)

Microcrystalline quartz, SiO₂ (chalcedony; agate variety)

Polished carnelian

Carnelian, a reddish-orange cryptocrystalline chalcedony (SiO₂), colored mainly by iron oxides.

Polished red jasper and carnelian-like stones

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

Orange-red jasper pebble

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

Tumbled orange chalcedony (likely carnelian)

Cryptocrystalline quartz, SiO₂; orange variety commonly called carnelian

Raw orange chalcedony (carnelian-like)

Chalcedony, microcrystalline quartz (SiO₂), colored by iron oxides

Polished pink agate/chalcedony pebble

Chalcedony (microcrystalline quartz, SiO₂), likely iron-stained agate

Tumbled yellow jasper

Jasper, microcrystalline quartz (SiO₂) colored by iron oxides

Tumbled jasper or jasper-rich chert

Microcrystalline quartz (SiO₂) with iron-oxide impurities

Tumbled chalcedony or agate

Microcrystalline quartz (SiO₂), likely chalcedony with iron-oxide staining

Tumbled jasper (likely brecciated or orbicular jasper)

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

Polished/tumbled agate (likely carnelian or iron-stained chalcedony)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide inclusions

Chalcedony with jasper (likely brecciated jasper)

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

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Banded Agate (Chert/Chalcedony)

Silicon Dioxide (SiO2)

Tumbled jasper, likely brecciated or brown-green jasper

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

Agate (or Chalcedony)

SiO2 (Silicon Dioxide) - a cryptocrystalline variety of quartz

Tumbled brown jasper (likely)

Microcrystalline quartz, SiO₂; jasper is an opaque variety of chalcedony

Likely rough carnelian (orange-brown chalcedony)

Chalcedony, microcrystalline quartz (SiO₂); variety possibly carnelian

Bloodstone

Heliotrope

Orca Agate

Chalcedony (SiO2) with various inclusions

Red Jasper

Jasper (Silicate mineral - SiO2)

Chrysoprase

Chalcedony (Silicon Dioxide, SiO2), flavored by Nickel

Jasper (or possibly Agate/Chalcedony) beads

SiO2 (Silicon Dioxide)

Agate

Chalcedony (Microcrystalline Quartz) - SiO2

Tumbled chalcedony (likely agate or jasper)

Microcrystalline quartz, SiO₂ (chalcedony)

Agate (Carnelian-like)

Chalcedony (Silicon Dioxide, SiO2)

Likely tumbled brown agate

Microcrystalline quartz (SiO₂), a variety of chalcedony

Chalcedony (Botryoidal Agate vein)

Chalcedony (Microcrystalline Quartz) - SiO2

Red jasper pebble

Microcrystalline quartz (SiO₂), colored chiefly by iron oxides

Polished brecciated jasper

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

Yellow Jasper

Silicon dioxide with iron inclusions (SiO2)

Polished agate or chalcedony pebble

Microcrystalline quartz, SiO₂ (chalcedony; exact identification uncertain from the image)

Dyed agate slice

Microcrystalline quartz (SiO₂), typically banded chalcedony

Likely tumbled jasper or agate

Microcrystalline quartz (SiO₂), possibly iron-rich jasper

Tumbled jasper (likely brecciated or red jasper)

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

Polished red jasper (likely brecciated or orbicular jasper)

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

Tumbled reddish-brown stone, possibly jasper or quartzite

Uncertain; likely microcrystalline quartz (SiO₂), potentially iron-stained jasper

Tumbled banded agate

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