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carminite
Carminite (PbFe3+2(AsO4)2(OH)2〔http://pubsites.uws.edu.au/ima-cnmnc〕) is an anhydrous arsenate mineral containing hydroxyl. It is a rare secondary mineral that is structurally related to palermoite (Li2SrAl4(PO4)4(OH)4).〔 Sewardite (CaFe3+2(AsO4)2(OH)2) is an analogue of carminite, with calcium in sewardite in place of the lead in carminite. Mawbyite is a dimorph (same formula, different structure) of carminite; mawbyite is monoclinic and carminite is orthorhombic.〔 It has a molar mass of 639.87 g.〔 It was discovered in 1850〔 and named for the characteristic carmine color.〔〔
== Structure ==
Carminite belongs to the orthorhombic crystal class (2/m 2/m 2/m) and has space group C ccm or C cc2.〔Finney J J (1963) American Mineralogist 48: 1-13〕 The structure consists of linked octahedra of iron surrounded by oxygen and hydroxyl which are aligned parallel to the c axis. They are connected together in the direction of the an axis by arsenate tetrahedra (arsenic surrounded by 4 oxygen). Coordination about the lead atoms is eight-fold.〔 The edges of the unit cell have lengths a = 16.59 Å, b = 7.58 Å and c = 12.295 Å. There are 8 formula units in each unit cell (Z = 8).〔
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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