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Rad Man Minerals

Autunite - Ruggles Mine, Grafton, Grafton County, New Hampshire, USA

Autunite - Ruggles Mine, Grafton, Grafton County, New Hampshire, USA

Regular price $20.00 USD
Regular price Sale price $20.00 USD
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Autunite from Ruggles Mine in New Hampshire is a striking uranium phosphate mineral known for its vibrant yellow-green coloration and strong fluorescence under UV light. It typically forms as thin, tabular crystals or scaly aggregates, often coating fractures and surfaces within the host rock. The mineral’s intense fluorescence is due to its uranium content, making it highly sought after by collectors. At Ruggles Mine, autunite occurs in association with granite-hosted pegmatites, where it forms as a secondary mineral through the alteration of primary uranium-bearing minerals like uraninite.

Ruggles Mine, historically one of the oldest mica mines in the United States, is well known for its diverse suite of pegmatite minerals, including autunite. While mica was the primary resource extracted, the presence of uranium-bearing minerals has made the site an interesting locality for mineral enthusiasts. Autunite specimens from Ruggles Mine are often found alongside minerals such as muscovite, feldspar, and beryl. Due to its uranium content, autunite is highly radioactive and should be handled and stored with care to prevent exposure to radiation and dehydration, as the mineral can lose water over time and alter to meta-autunite.

Approx. specimen size: 45mm x 25mm x 15mm

Approx. specimen activity on an SE International Ranger EXP: 100 cpm

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