Tennants’ second auction of Minerals and Fossils will be taking place on 26th May – and this cabinet displays selected highlights of fossils and minerals from the sale. Included is a display specimen of green Fluorite with interpenetrant twinned crystals, from the Heights Mine Weardale, Co Durham, and a display specimen of green Fluorite with interpenetrant twinned crystals, from the Heights Mine Weardale, Co Durham.

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