Tremolite

specimen number:
1605134

location:
Wilberforce, Haliburton Co., Ontario, Canada

description:
Slightly translucent lustrous green terminated crystals of tremolite measuring to 2.8 cm in height coming off matrix. In good condition.

Wilberforce, located in Haliburton County, Ontario, Canada, has a history rooted in mineral exploration and small-scale mining that began in the early 20th century, highlighted by the discovery of radioactive minerals by prospector W.M. Richardson in 1922. Initial development at the local Fission (Richardson) mine occurred primarily between 1929 and 1931, with intermittent prospecting, trenching, and brief exploratory operations continuing through the 1940s and the major 1950s uranium boom, though commercial-scale production was short-lived or experimental rather than long-term. Geologically, the area sits within the Central Metasedimentary Belt of the Mesoproterozoic Grenville Province. The local geology is characterized by complexly deformed and metamorphosed Precambrian rocks, including Grenville marbles, granitic gneisses, and pegmatite dikes. These intrusive pegmatites and skarn-like carbonate environments host a famous assemblage of rare-element and radioactive minerals, including uraninite, fluorite, apatite, and zircon, alongside accessory sulfides like pyrite.

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