Mineral, Variety Of Chalcedony (Microcrystalline Quartz)

Tumbled carnelian agate

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

Agate (Chalcedony)

Agate (Silicon Dioxide - SiO2)

Polished jasper pebble

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

Jasper (Multi-color Chert)

Silicon Dioxide (SiO2) with impurities

Dragon Blood Jasper

SiO2

Tumbled jasper pebble

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

Polished leopard-skin jasper

Jasper (microcrystalline quartz, SiO₂), commonly orbicular or brecciated varieties

Tumbled jasper

Microcrystalline quartz (SiO₂), commonly iron-oxide-bearing chalcedony

Polished brown agate (likely carnelian/chalcedony)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

Brown botryoidal chalcedony (likely iron-stained agate)

Microcrystalline quartz, SiO₂; chalcedony/agate variety

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

Tumbled yellowish quartz or chalcedony

Quartz/chalcedony, SiO₂

Chert (Gray Chalcedony)

Microcrystalline Quartz (SiO2)

Polished ocean jasper / orbicular jasper (likely)

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

Fancy Jasper

Silicon Dioxide (SiO2) with mineral inclusions

Quartz (Chalcedony/Agate nodule)

Silicon dioxide (SiO2)

Polished agate (likely)

Banded chalcedony, a microcrystalline variety of quartz (SiO₂)

Banded Agate (Dyed Purple)

Agate (Variety of Chalcedony/Quartz), SiO2

Chalcedony Pebble

Cryptocrystalline Quartz (SiO2)

Tumbled yellow-brown jasper or chalcedony

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

Honey/brown agate (chalcedony)

Microcrystalline quartz, SiO₂; likely translucent agate or chalcedony

Tumbled orange chalcedony or carnelian

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

Chalcedony (Agate Pebble)

Microcrystalline Quartz (SiO2)

Tumbled quartz-rich chalcedony (likely carnelian or orange jasper)

Microcrystalline quartz, SiO₂, colored mainly by iron oxides

Chalcedony (Quartz variety)

Silicon Dioxide (SiO2)

Tumbled brown jasper (likely)

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

Tumbled Chalcedony

Quartz (Silicon Dioxide - SiO2)

Banded Agate (Jasper-Agate)

Silicon Dioxide (SiO2) - Chalcedony Variety

Polished red-and-cream jasper

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

Red-orange jasper pebble

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

Polished red jasper (likely brecciated or opaque chalcedony)

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

Tumbled jasper pebble

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

Polished jasper or iron-stained chert

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

Agate

Chalcedony (Cryptocrystalline variety of Quartz, SiO2)

Blue Lace Agate

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Blue chalcedony cabochon (likely dyed)

Microcrystalline quartz, SiO₂ (chalcedony)

Tumbled chalcedony (likely yellow/brown agate or carnelian)

Microcrystalline quartz, SiO₂; chalcedony with possible iron-oxide staining

Red Jasper

Quartz (Silicon Dioxide) with Hematite inclusions, SiO2

Polished agate (likely moss or plume agate)

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

Agate (Geode nodule fragment)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Tumbled agate/chalcedony pebble

Microcrystalline quartz (SiO₂), likely agate or jasper variety

Polished banded agate (likely carnelian and black agate)

Chalcedony, microcrystalline quartz (SiO₂), with iron-oxide coloration