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Ca2Cu9(AsO4,SO4)4(OH,O)10 · 10H2O
Crystal System:
For the relation to tyrolite (considered to be orthorhombic at that time).
A synonym of Tangdanite
"Clinotyrolite" was published without CNMMN approval because the authors thought it is different from tyrolite (which was considered to be orthorhombic at that time). However, tyrolite was later shown to be monoclinic(-pseudo-orthorhombic), with at least two monoclinic polytypes being detected (Krivovichev et al., 2006); one of them seems to be identical to "clinotyrolite".
Since it is well-known that also carbonate-free varieties of tyrolite exist, "tyrolite" may actually represent more than two minerals/polytypes.

In 2014, clinotyrolite was discredited due to being identical with the (approved) tangdanite.

Clinotyrolite was originally described from Lanniping Mine, Dongchuan Cu ore field, Dongchuan District, Kunming Prefecture, Yunnan Province, China and Tangdan Mine, Dongchuan Cu ore field, Dongchuan District, Kunming Prefecture, Yunnan Province, China.

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References for ClinotyroliteHide

Reference List:
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Ma Zhesheng, Qian Rongyao, and Peng Zhizhong (1980): Clinotyrolite: A new mineral of the hydrous copper arsenate discovered in Dongchuan, Yunnan. Acta Geologica Sinica 54(2), 134-143 (in Chinese with English abstract). - Mineralogical Abstracts 80, 4909 (abstract).
"Clinotyrolite has been published without CNMMN approval. It might well be a separate phase." (Ernst Burke - 21/06/2004).
Krivovichev, S. V., Chernyshov, D. Yu., Döbelin, N., Kahlenberg, V., Tessadri, R., Armbruster, T. and Kaltenhauser, G. (2005): The crystal structure of tyrolite, Ca2Cu9(AsO4)4(CO3)(OH)8(H2O)10: synchrotron X-ray diffraction study. Mitt. Österr. Mineral. Ges. 151, 74. (Poster abstract)
Krivovichev, S.V., Chernyshov, D. Yu., Dobelin, N., Armbruster, Th., Kahlenberg, V., Kaindl, R., Ferraris, G., Tessadri, R., Kaltenhauser, G. (2006). Crystal chemistry and polytypism of tyrolite. American Mineralogist, 91, 1378-1384.
Zhesheng, M., Guowu, L., Chukanov, N. V., Poirier, G., Nicheng, S. (2014): Tangdanite, a new mineral species from Yunnan Province, China and the discreditation of 'clinotyrolite'. Mineralogical Magazine 78, 559-569.

Internet Links for ClinotyroliteHide

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