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Serpierite
Serpierite (Ca(Cu,Zn)4(SO4)2(OH)6·3H2O) is a rare, sky-blue coloured hydrated sulfate mineral, often found as a post-mining product. It is a member of the devilline group, which has members aldridgeite (Cd,Ca)(Cu,Zn)4(SO4)2(OH)6·3H2O, campigliaite Cu4Mn2+(SO4)2(OH)6·4H2O, devilline CaCu4(SO4)2(OH)6·3H2O, kobyashevite Cu5(SO4)2(OH)6·4H2O, lautenthalite PbCu4(SO4)2(OH)6·3H2O and an unnamed dimorph of devilline.〔 It is the calcium analogue of aldridgeite and it is dimorphous with orthoserpierite CaCu4(SO4)2(OH)6·3H2O.〔
It was discovered in 1881 and named by Alfred Des Cloizeaux in honour of . Serpieri was an Italian revolutionary, engineer and mining entrepreneur who developed mines in the Lavrion area of Greece〔 and founded the Montecatini Company.〔 He was born in Italy in 1832 and died in Greece in 1897.〔
== Crystallography ==
Serpierite is a hydrated sulfate with the formula Ca(Cu,Zn)4(SO4)2(OH)6.3H2O〔 with molar mass 644.32 g〔 and calculated density 3.08 g/cm3.〔〕 It belongs to the monoclinic crystal system, point group 2/m and space group C2/c.〔 It is pseudo-orthorhombic〔〕 and isostructural with aldridgeite.〔
The unit cell has side a of length 22.2 Å, side c of length 21.9 Å and the angle β between them equal to 113.4°. The third side b, which is perpendicular to both a and c, has length 6.25 Å. There are 8 formula units (Z = 8) per unit cell.〔〔〔〔
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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