. A siderite specimen (an epimorph after calcite) with hollow, waxy, granular surfaced, biscuit-coloured, accompanied by sphalerite, with Dr M. G. 'Sam' Weller, MBE, collection label; Dr Bonewitz notes 'An epimorph forms when one mineral is coated by another - in this case calcite by siderite - and the interior mineral is then dissolved away, leaving a hollow shell'. See Bonewitz, Dr. Ronald Louis, Rocks & Minerals, 2008, p.178. 81 grams, 58mm (2 1/4"). Ex Dr M. G. 'Sam' Weller, MBE, collection, Cornwall, UK; acquired Dragon Minerals; from Aggeneys, Northern Cape Province, South Africa. Dr Maurice G. Weller, MBE, Ph.D, FISC, traded for many years as 'Sam Weller Minerals' following an interest held from the age of 12 years when he inherited a 19th century family collection; he was a member and sometime President of the Royal Geological Society of Cornwall and a member of Cornwall Archaeological Society (born Cornwall, 31 March 1931"). He had joined the RAF as a young man and spent 22 years in developing sophisticated military radar technology (for which he was awarded his MBE) until he medically retired in 1969, after which he established Yonder Town Field Studies Centre in Newquay, Cornwall before moving to Pendeen. Sam has now decided that the time has come to part with his private collection of minerals, including a number from historic Cornish sites, some with 19th century pedigrees. [No Reserve]

Extremely fine condition. Rare.