Mineral (Cryptocrystalline Quartz)

Black Onyx

Chalcedony (Silicon Dioxide, SiO2)

Black Onyx (Tumbled)

Silicon Dioxide (SiO2)

Polished brown jasper pebble

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

Polished carnelian/chalcedony

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony

Red jasper (likely polished/tumbled)

Jasper, an opaque microcrystalline variety of quartz; mainly SiO₂ with iron-oxide inclusions

Polished banded agate (likely Botswana or plume-type agate)

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

Tumbled carnelian/chalcedony

Microcrystalline quartz (SiO₂), iron-oxide-stained chalcedony

Tumbled brown mineral pebble, possibly jasper or weathered quartzite

Indeterminate from the blurred image; likely microcrystalline quartz (SiO₂) if jasper, or quartzite dominated by quartz

Tumbled orbicular jasper (likely ocean jasper)

Microcrystalline quartz/chalcedony (SiO₂) with iron oxides and other accessory minerals

Tumbled amber-colored chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; orange-red variety commonly termed carnelian

Tumbled yellow chalcedony (likely honey agate or yellow jasper)

Microcrystalline quartz, SiO₂; precise identification is uncertain from the photograph

Banded agate (likely carnelian–chalcedony agate)

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

Petrified Wood

Silicified Wood (SiO2)

Chalcedony (Agate/Chert)

Chalcedony (Silicon Dioxide, SiO2)

Tumbled orange chalcedony / jasper

Microcrystalline quartz, SiO₂, likely iron-stained chalcedony or quartz-rich jasper

Red Jasper with Quartz

Microcrystalline Quartz (SiO2)

Jasper with Quartz Vein

Microcrystalline quartz (SiO2) and chalcedony with a quartz vein

Tumbled dark reddish-brown stone, possibly red jasper

Jasper, microcrystalline quartz (SiO₂), likely iron-oxide colored

Tumbled jasper or iron-rich chert

Microcrystalline quartz (SiO₂), likely colored by iron oxides

Chalcedony (Botryoidal or Chalcedony Rose)

Silicon dioxide (SiO2)

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz-veined Diabase or Basalt Pebble

Diabase or Basalt with Hydrothermal Quartz Veins (SiO2)

Polished red jasper

Jasper, microcrystalline quartz (SiO₂)

Jasper

Microcrystalline Quartz (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Orange carnelian (likely tumbled chalcedony)

Carnelian, an orange variety of chalcedony (microcrystalline quartz, SiO₂)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Chrysocolla on Matrix

Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4·nH2O

Milky quartz pebble

Quartz, silicon dioxide (SiO₂), cryptocrystalline-to-coarse crystalline aggregate

Quartz Pebble

Silicon Dioxide (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Hag Stone

Perforated Flint or Chert

Chert (with Quartz Veining)

Microcrystalline Quartz (SiO2)

Reddish-brown chert or jasper fragment

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

Tumbled Ocean Jasper (likely orbicular jasper)

Microcrystalline quartz (SiO₂), chiefly chalcedony with iron oxides and other inclusions

Blue Chalcedony

Silicon Dioxide (SiO2)

Polished red jasper and carnelian-like stones

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

Petrified Wood

Silicified Wood (SiO2)

Bloodstone

Chalcedony (Quartz)

Chalcedony (Agate/Carnelian variant)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Chalcedony Pebble

Silicon Dioxide (SiO2)