USA (Part 2)
Sources:
Colorado
- Blanca (San Luis Hills)
- Del Norte (Twin Mountains)
- Log House Creek
- Specimen Mountain
Idaho
- Bruneau
- Crutcher's Crossing (rare)
- Fir Grove (Gooding)
- Marsing (Blue Opal)
- Rabbit Springs
- Spencer Opal Mine
- Willow Creek
Minnesota
- 5 Mile Hill
Michigan
- Isle Royale
- Keweenaw Point (subsurface)
Missouri
- St. Francois Mountains
Montana
- Avon (near)
- Gallatin Valley
Colorado
size:
A large Del Norte thunderegg with some clear chalcedony filling.
Idaho
size:
The famous so called Bruneau jasper, a thunderegg jasper from a quarry in the Bruneau Canyon (Owyhee Co.).
size:
A thunderegg with botryoidal chalcedony from Rabbit Springs (Twin Falls Co.).
size:
A nice slab of the famous and expensive Willow Creek Jasper from the same named creek in the Ada Co. This jasper occurs in thundereggs.
Michigan
size:
Keweenaw Point is a pretty rare location. The eggs are collected sub-surface. Very old and very intersting.