Home > American Minerals – March 20 > MS1308 Uraninite with alteration
Uraninite with alteration - Sold
- Ruggles quarry
- Grafton
- Grafton County
- New Hampshire
- U.S.A.
- 1.8 by 1.3 by 1.2 cm – Thumbnail specimen (fits into a 2.5 cm cube)
Known as gummite, the yellow-orange encrustations alterating from uraninite have long challenged mineralogists. Frondel (1956) identified over a dozen different species in gummite specimens. Foord et al. (1997) found schoepite-like minerals in material from the Ruggles mine.
This specimen consists of intergrown cubes of uraninite, to 1.0 cm on edge, with encrustations of various uranium minerals. A nice example, affordable, and from the collection of famous collector David P. Wilber.
