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Clinoptilolite-Ca-Heulandite-Ca Series, Siderite

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Locality: New Cook's Kitchen Mine, South Crofty Mine (South Wheal Crofty), Illogan, Camborne - Redruth - St Day District, Cornwall, England, UK

Collected from a joint fracture in greenstone in May 2005 from the North Access Drive, Tuckingmill Decline Shaft. Crystals to 0.75mm with siderite to 1mm.
The Ca-dominance was established by XRF analysis.
Paul G. Oldfield collection.

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Photo added: 5th Sep 2011

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