grail
copper agate
native copper + chalcedony
The tell
Chalcedony and native copper in the same stone: a solid metal field meeting milky blue-white silica, usually with a crusty red-maroon or green oxide seam between them.
On a cut and polished face the copper shows fine dark flow-lines where the wheel cut down through its growth layers, like the end grain of a burl. That is the tell nothing else has.
What it gets mistaken for
The facts
- also callednative copper + chalcedony
- age~1.1 billion yrs
- where it turns upKeweenaw Peninsula
- on the chartgrail · 100 stickers ever
Put it on the shelf
Every stone on this chart is drawn and kiss-cut at three inches. The rarer the stone, the fewer exist: only 100 copper agate will ever be printed, then the run is retired.
10% of every order goes to the Roscommon County Animal Shelter.