Uraninite Crystal in Matrix — Cardiff Uranium Mine, Cardiff Township, Ontario, Canada

A large crystal specimen of Uraninite in natural matrix from the Cardiff Uranium Mine in Cardiff Township, Haliburton County, Ontario — a significant and historically documented Canadian uranium mineral locality within the Precambrian metamorphic terrain of the Grenville Province.

The Cardiff Mine operated within the same Bancroft-Haliburton mineral district that has produced some of Canada's finest uranium and thorium mineral specimens, hosted in the ancient gneisses and pegmatites of the Grenville Province. Uraninite from this locality occurs in well-crystallized form associated with the characteristic mineral assemblages of the region, making matrix specimens with intact crystal development particularly desirable for advanced collectors.

Matrix specimens preserve the natural geological context of the mineral — the relationship between the Uraninite crystal and its host rock tells the story of formation conditions that isolated specimens cannot convey. Large cabinet-sized matrix pieces from documented Canadian uranium localities are increasingly scarce as historical mining collections are dispersed.

Uraninite is a radioactive mineral. Suitable for advanced collectors and researchers with appropriate handling and storage knowledge. This specimen comes out of my personal collection, and is one of the few large Uraninite crystal I have ever seen from this locale.

Approx. specimen size: 35mm x 30mm x 20mm

Approx. specimen weight: 23.20 grams

Approx. specimen activity on an SE International Ranger EXP: 89000 CPM