Mineral_variety_of_chalcedony

Ocean Jasper

Silicon Dioxide (SiO2)

Red Jasper or Iron-stained Quartz

SiO2 with Fe impurities

Orange-pink chalcedony (likely carnelian/chalcedony rough)

Microcrystalline quartz, SiO₂; iron-oxide-bearing chalcedony

Jasper

SiO2 (Cryptocrystalline quartz)

Polished brecciated jasper (likely)

Microcrystalline quartz, SiO₂, with iron-oxide-rich brown fragments and pale silica

Agate

SiO2

Red jasper (likely)

Microcrystalline quartz, SiO₂, colored red by iron oxides

Chalcedony (Agate / Chert)

Silicon Dioxide (SiO2)

Tumbled amber-colored quartz/chalcedony (likely carnelian or honey agate)

Microcrystalline quartz, SiO₂; coloration may derive from iron oxides

Geode (Unopened)

Quartz/Chalcedony concretion

Chalcedony

Silicon Dioxide (SiO2)

Tumbled blue chalcedony

Chalcedony, microcrystalline quartz (SiO₂)

Tumbled chalcedony (possibly agate)

Microcrystalline quartz, SiO₂ (chalcedony); banding is not clearly visible to confirm agate

Jasper

SiO2

Chalcedony

Chalcedony (SiO2)

Small reddish-brown pebble, possibly jasper or iron-stained quartz

Unidentified silica-rich pebble; visual identification is insufficient to distinguish jasper, quartz, or another material

Iron-rich jasper (likely rough jasper/chert)

Microcrystalline quartz (SiO₂), colored by iron oxides

Chalcedony with Quartz

Silicon Dioxide (SiO2)

Jasper (likely brecciated jasper)

Microcrystalline quartz/chalcedony (SiO₂), with possible iron-oxide coloring

Lake Superior Agate

Silicon Dioxide (Chalcedony variety)

Chalcedony (Agate/Carnelian)

Silicon Dioxide (SiO2)

Brecciated jasper

Jasper (microcrystalline quartz, SiO₂), likely iron-oxide-rich breccia

Tumbled chalcedony (likely orange agate/carnelian)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

Polished honey/brown agate (likely carnelian chalcedony)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

Honey-colored chalcedony (rough agate/chert)

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

Chalcedony nodule (likely agate)

Microcrystalline quartz, SiO₂; banded varieties are agate

Brown chalcedony (likely carnelian/agate)

Microcrystalline quartz, SiO₂; chalcedony variety

Tumbled pink chalcedony (likely pink agate)

Chalcedony, microcrystalline SiO₂; variety of quartz

Tumbled yellow-orange chalcedony (likely carnelian or honey agate)

Microcrystalline quartz, SiO₂; orange coloration commonly from iron oxides

Carnelian agate (likely)

Cryptocrystalline quartz, SiO₂; orange chalcedony with iron-oxide staining

Blue Lace Agate (or similar Chalcedony)

SiO2 (Silicon Dioxide)

Lake Superior Agate

Silicon Dioxide (Chalcedony variety)

Tumbled brown agate (likely carnelian/chalcedony)

Microcrystalline quartz, SiO₂; chalcedony, possibly iron-stained

Polished orange agate (likely carnelian)

Chalcedony, microcrystalline quartz (SiO₂); orange-red variety commonly called carnelian

Yellow jasper carving

Jasper, an opaque microcrystalline variety of quartz (SiO₂), shaped as a butterfly

Brown chalcedony (agate-like flint/chert fragment)

Chalcedony, microcrystalline quartz (SiO₂); identification is tentative from the photo

Brown chalcedony (likely carnelian or agate fragment)

Microcrystalline quartz, SiO₂; iron-oxide-colored chalcedony

Tumbled orange chalcedony

Chalcedony (microcrystalline quartz, SiO₂), likely orange carnelian

Chalcedony (Tumbled)

Cryptocrystalline Quartz (SiO2)

Tumbled pale agate or chalcedony

Microcrystalline quartz (SiO₂), likely agate/chalcedony

Chalcedony in Matrix

Silicon Dioxide (SiO2)

Chalcedony (Quartz Var.)

Silicon Dioxide (SiO2)