This is a "Figured specimen".
Mindat photo 8099 published in Ron Cleevley's paper on "The Barnstaple Zeolite".
(Ref: Cleevely, R.J. "Discovery of the Barnstaple zeolite:a minor geological controversy in the early 1800s." Devonshire Association, Report & Transactions, 2007)
22nd Nov 1997
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