
Biggs jasper
A locality-linked picture jasper · not a mineral species
A growing field cabinet of cutting material from the American West.
← Return to the Specimen LibraryA page in progress. Start with a name, a pattern or a place. These records trace the material’s geology and collecting story without turning a visual resemblance into proof of origin.
Named records and regional guides are being expanded; some reference photographs and bed-specific details remain in review.
Color helps narrow the cabinet. It does not prove a material’s identity or locality.

A locality-linked picture jasper · not a mineral species

A locality-linked jasper · Bruneau River canyon

Montana moss agate · a regional lapidary name

A group of named beds · not one uniform material

Fossil wood with a mineral-filled second story

Obsidian; volcanic glass

Locality-linked jasper/trade name

Regional comparison group; jasper and agate labels

Chalcedony; locality/trade-name agate

Moss-bearing chalcedony / jasper–agate · Oregon locality name
Silicified petrified wood; mineralized fossil material

Plume/inclusion-bearing agate; geographic trade family
Named Graveyard Point plume-agate variation

Agate/chalcedony-filled volcanic thunderegg material
Agate-filled volcanic thunderegg
Agate / opal-bearing volcanic thunderegg; source-labelled bed
Moss-bearing volcanic thunderegg; locality/trade label
Volcanic rock; welded rhyolitic tuff
Quartz/chalcedony-filled volcanic geodes
Silica-filled rhyolitic nodules and geodes
Nephrite; interlocking amphibole rock

Agate; sedimentary-hosted chalcedony
Ranch/deposit group; silica-filled volcanic nodules
Trade/locality-linked brecciated jasper
Regional opal group; some wood-associated material
Locality-linked opal; rough and assembled products must be distinguished
Silicified fossil wood; locality group
Locality-linked blue chalcedony/agate

Regional agate / jasper–chalcedony · Pastelite trade-name context
Regional patterned volcanic-rock trade name
Locality-linked iridescent chalcedony
Copper-bearing labradorite feldspar
Local name for silicified laminated sediment
Mine/locality label; several silicified materials
Regional umbrella; not a single material
Natural opal; several appearances and stability classes

Transported chalcedony; coastal comparison group
Silica-filled plant mould; distinguish from preserved wood texture
Regional/trade name for picture material
Regional structure group; silica-filled volcanic nodules

Trade-named spotted siliceous material
Silicified wood; locality label
Locality/trade-named picture material
Trade/locality-named patterned silica

Brecciated jasper–chalcedony · California locality/trade name

Patterned carbonate lapidary material · Calico Mountains trade name

Tube-patterned chalcedony · Oregon locality/trade name

Silicified fossil wood · founder-labelled Oregon comparison

Red patterned jasper · Maricopa County, Arizona
No record matches this combination yet. Try another color, material or state.
THE AMERICAN WEST / A GROWING FIELD CABINET
We’re building a field guide to the lapidary materials of the American West, one state at a time. Oregon is our first major collection focus. We’re adding verified examples and refining the records as the cabinet grows; the neighbouring states will follow.
Want to know when the next state collection is ready? A collection-update signup will be available here when registration opens.