Ankangite from the Monte Arsiccio mine (Apuan Alps, Tuscany, Italy): occurrence, crystal structure, and classification problems in cryptomelane group minerals

被引：16
|
作者：
Biagioni, Cristian [1 ]
Orlandi, Paolo [1 ]
Pasero, Marco [1 ]
机构：
[1] Univ Pisa, Dipartimento Sci Terra, I-56126 Pisa, Italy
来源：
PERIODICO DI MINERALOGIA | 2009年 / 78卷 / 02期
关键词：
ankangite; crystal structure; classification; Monte Arsiccio mine; Apuan Alps; Tuscany; MODULATED STRUCTURE; HOLLANDITE; REDLEDGEITE; MANNARDITE; PRIDERITE;
D O I：
10.2451/2009PM0005
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
A new occurrence of ankangite, a rare member of the hollandite structural family, is described. Ankangite was found in small fractures in dolomitic marble at the Monte Arsiccio mine, a small deposit of baryte, pyrite and Fe oxides in the Apuan Alps, Tuscany, Italy. The mineral Occurs as prismatic black crystals, up to 5 mm in length, associated with "apatite", anatase, arsenopyrite, Ba-rich K-feldspar, baryte, dolomite, pyrite, quartz, sphalerite, stibnite, valentinite, and zinkenite. The crystal structure of ankangite from the Monte Arsiccio mine wits refined to R(1) = 0.016. Ankangite is a member of the titanate subgroup in the cryptomelane group. The classification and nomenclature of the hollandite-group minerals are discussed.
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页码：3 / 11
页数：9
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