Gummite & Uraninite Endcut — Ruggles Mine, Grafton, New Hampshire, USA

The Ruggles Mine is one of the most storied pegmatite localities in the northeastern United States, and its uranium mineral material — while not common — is among the most visually compelling produced by any North American site. This endcut section reveals a vivid cross-section of alteration mineralogy at its finest: primary uraninite in various stages of oxidative transformation into the suite of secondary uranium oxides collectively known as gummite.

The coloration is exceptional. Gummite from Ruggles typically presents in a palette of deep oranges, burnt reds, waxy yellows, and earthy browns — all representing distinct secondary uranium phases including betauranophane, kasolite, and curite-group minerals that develop as uraninite weathers in the pegmatite environment. The endcut format makes this a superb display and study specimen, presenting the mineral zonation clearly without obscuring matrix context.

Old, well-coloured material from a classic American locality. A standout piece for the radioactive or historical collector.

Approx. specimen size: 55mm x 45mm x 18mm

Approx. specimen weight: 105.13 grams

Approx. specimen activity on an SE International Ranger EXP: 200000 CPM