A piece of rare natural* red Zincite and a piece of natural Chalcopyrite, individually mounted in Woods metal. These form the main components of a 'Perikon' detector. The Zincite mount has an M2.5 mounting stud and the Chalcopyrite mount is tapped M3 on the back face. Size indicator: the brass Chalcopyrite mount is 11mm dia. nom.
*natural by-product of zinc processing
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