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Ianbruceite
Ianbruceite is a rare hydrated zinc arsenate with the formula ()(H2O)2; material from the Driggith mine has traces of cobalt.〔〔 It was first discovered at Tsumeb, approved by the International Mineralogical Association as a new mineral species in 2011, reference IMA2011-49, and named for Ian Bruce,〔http://crystalclassics.co.uk/page.php?id=3>〕 who founded "Crystal Classics" in the early 1990s, and was heavily involved in attempts to reopen the famous Tsumeb mine for specimen mining.
In 2013 new occurrences of ianbruceite were reported from the neighbouring Driggith and Potts Gill mines on High Pike in the Caldbeck Fells, Cumbria, England. Here the mineral is probably a post-mining product.〔 Caldbeck Fells and Tsumeb are the only reported localities for ianbruceite to date (May 2013).
== Structure ==
There are four formula units per unit cell (Z = 4).〔 Unit cell parameters are the lengths of the sides of the unit cell, a, b and c, and the angle β between the a and c crystal axes. For ianbruceite a = 11.793 Å, b = 9.1138 Å, c = 6.8265 Å, and β = 103.859°.〔〔〔 It belongs in the monoclinic, prismatic crystal Class 2/m, with space group P21/c.〔〔〔
Ianbruceite consists of layers with composition () alternating with an inter-layer space containing loosely bound water molecules.〔 The arsenic is tetrahedrally coordinated by four oxygen anions.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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