Mineralish (Variety Of Chalcedony)

Banded agate cabochon

Microcrystalline quartz (chalcedony), SiO₂

Blue Lace Agate

Microcrystalline Quartz (Chalcedony), SiO2

Agate

Silicon Dioxide (Chalcedony), SiO2

Tumbled chalcedony pendant (likely agate)

Chalcedony, microcrystalline quartz (SiO₂); the pale bands suggest agate

Jasper (likely brecciated jasper)

Microcrystalline quartz, SiO₂, colored by iron oxides

Polished jasper (likely brecciated or red jasper)

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

Orange cabochon ring

Possibly carnelian (microcrystalline quartz, SiO₂); identification from the photograph is uncertain.

Black onyx-style bead bracelet

Likely polished black chalcedony (microcrystalline quartz, SiO₂); the beads may also be dyed agate or another black stone.

Red jasper (likely iron-rich chert)

Microcrystalline quartz, SiO₂, colored mainly by hematite/goethite

Polished carnelian agate

Microcrystalline quartz, SiO₂, commonly chalcedony with iron-oxide coloring

Red jasper (probable)

Microcrystalline quartz/chalcedony (SiO₂) colored by iron oxides

Tumbled dark reddish-brown stone, possibly red jasper

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

Tumbled carnelian (orange chalcedony)

Carnelian, a microcrystalline quartz variety; SiO₂, commonly colored by dispersed iron oxides

Raw carnelian/chalcedony

Microcrystalline quartz (SiO₂), orange chalcedony with iron-oxide coloration

Red jasper

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

Polished agate (likely moss or plume agate)

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

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides

Tumbled Agate

Silicon Dioxide (SiO2)

Jasper

Silicon Dioxide (SiO2) with impurities

Jasper / Chert (Lake Superior Agate or similar chalcedony nodule)

Microcrystalline Quartz (SiO2)

Tumbled quartz-rich stone, likely brown agate or jasper

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

Polished agate or chalcedony cabochon (probable)

Microcrystalline quartz, SiO₂; likely translucent chalcedony with subtle agate banding

Tumbled jasper or iron-rich chert

Microcrystalline quartz (SiO₂), likely colored by iron oxides

Tumbled jasper, likely ocean or brecciated jasper

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

Tumbled brown jasper (likely common jasper or chert)

Microcrystalline quartz, SiO₂, chiefly chalcedony/quartz with iron-oxide impurities

Polished brown jasper or chert pebble

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

Chalcedony (Agate/Carnelian pebbles)

Cryptocrystalline Quartz (SiO2)

Red Jasper

Silicon Dioxide with Iron inclusions (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Yellow Jasper

Silicon Dioxide (SiO2) with iron inclusions

Black Jasper

Silicon Dioxide (SiO2) with impurities

Red Jasper

Jasper (Silicon Dioxide with Hematite inclusions), SiO2

Agate

Silicon dioxide (SiO2)

Quartz (Agate/Chalcedony)

Silicon Dioxide (SiO2)

Green Jasper

Silicon Dioxide (SiO2) with iron silicate inclusions

Polished brecciated jasper (likely septarian or iron-rich jasper)

Microcrystalline quartz (chalcedony), SiO₂, with iron oxides and possibly calcite or other rock fragments

Yellow Jasper

Silicon dioxide (SiO2)

Red Jasper

Argillaceous microcrystalline quartz (SiO2 with Fe2O3 inclusions)

Jasper

Silicon dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2)