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January-February 2015

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Who's Who in Mineral Names: Roy Kristiansen (b. 1943)

Kristiansenite, Ca2ScSn(Si2O7)(Si2O6OH), is a calcium, scandium, tin sorosilicate found as a late-stage hydrothermal mineral in vugs in an amazonite pegmatite at Heftetjern, Tørdal, Telemark, Norway. The silicate structure has both double tetrahedra and isolated polyhedra. It occurs as colorless, white, or pale yellow, intensely twinned, triclinic crystals associated with quartz, albite, apatite, biotite, and stilpnomelane. The Heftetjern pegmatite hosts a significant number of scandium minerals, including bazzite, cascandite, heftetjernite, kristiansenite, oftedalite, scandiobabingtonite, and thortveitite. It is the type locality for three of these: heftetjernite, kristiansenite, and oftedalite. Kristiansenite was described and published by Raade et al. in 2002 and its crystal structure by Ferraris et al. in 2001. The name honors Roy Kristiansen, a well-known amateur mineralogist from Norway who first noticed the new mineral.

Dr. Steven C. Chamberlain, a consulting editor of Rocks & Minerals, is an avid collector and researcher specializing in the minerals of New York State.

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