Hostname: page-component-cd9895bd7-q99xh Total loading time: 0 Render date: 2024-12-24T16:34:41.523Z Has data issue: false hasContentIssue false
  • English
  • Français

Tangdanite, a new mineral species from the Yunnan Province, China and the discreditation of ‘clinotyrolite’

Published online by Cambridge University Press:  05 July 2018

Ma Zhesheng ,
Li Guowu ,
N. V. Chukanov ,
G. Poirier  and
Shi Nicheng
Ma Zhesheng
Affiliation:
Crystal Structure Laboratory, China University of Geosciences, Beijing 100083, P. R. China
Li Guowu*
Affiliation:
Crystal Structure Laboratory, China University of Geosciences, Beijing 100083, P. R. China
N. V. Chukanov
Affiliation:
Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow Region 142432, Russia
G. Poirier
Affiliation:
Canadian Museum of Nature, 1740 Pink Road, Gatineau, Quebec J9J 3N7, Canada
Shi Nicheng
Affiliation:
Crystal Structure Laboratory, China University of Geosciences, Beijing 100083, P. R. China
*
E-mail: [email protected]
Get access Rights & Permissions [Opens in a new window]

Abstract

Tangdanite, ideally Ca2Cu9(AsO4)4(SO4)0.5(OH)9·9H2O and monoclinic, is a new mineral species (IMA No. 2011-096) occurring in the Tangdan and Nanniping mines, southeast Dongchuan copper mining district, Dongchuan County, Kunming City Prefecture, Yunnan Province, P. R. China (26°11’N 103°51’E). The mineral is found in the oxidized zone (gossan) of an As-bearing Cu sulfide deposit and is clearly of supergene origin. Associated minerals are chalcopyrite, bornite, chalcocite, covellite, tennantite, enargite, cuprite, malachite, azurite, copper and brochantite. Crystals form radiating or foliated aggregates of flaky crystals up to 3 mm, flattened parallel to (100) and elongated along [001]. It is emerald green with a light green streak, translucent and has a pearly to silky lustre. It is sectile having perfect cleavage on {100} although neither parting nor fracture was observed. No fluorescence in long- or short-wave ultraviolet radiation was observed. The hardness is VHN50 42.0−43.6, mean 42.8 kg mm−2 (2−2½ on the Mohs scale). The density measured by pycnometry is 3.22 g cm−3 (Ma et al., 1980). The calculated density from the empirical chemical formula is 3.32 g cm−3. The compatability index gives 1 − (Kp/Kc) = −0.041 (good). The empirical formula (based on 36 O a.p.f.u) of tangdanite is Ca2.05Cu9.08(As1.03O4)4(S0.63O4)0.5(OH)9·9H2.04O. The simplified formula is Ca2Cu9(AsO4)4(SO4)0.5(OH)9·9H2O. The strongest five reflections in the X-ray powder-diffraction pattern [d in Å(I) (hkl)] are: 4.782(100) ( 1 1), 4.333(71) (6 0 2), 5.263(54) ( 0 2), 3.949(47) (8 0 2) and 2.976(46) ( 1 1). The unit-cell parameters are a = 54.490(9), b = 5.5685(9), c = 10.4690(17) Å, β = 96.294(3)o, V = 3157.4(9) Å3, Z = 4. Its structure was solved and refined in space group C2/c, with R = 0.110.

Keywords

tangdanitenew mineral species‘clinotyrolite’Dongchuan copper mining districtYunnanChina
Type
Research Article
Information
Mineralogical Magazine , Volume 78 , Issue 3 , June 2014 , pp. 559 - 569
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Brese, N.E. and O’Keeffe, M. (1991) Bond-valence parameters for solids. Acta Crystallographica, B47, 192–197.CrossRefGoogle Scholar
Krivovichev, S.V., Chernyshev, D.Y., Döblin, N., Armbruster, T., Kahlenberg, V., Kaindl, R., Ferraris, G., Tessadri, R. and Kaltenhauser, G. (2006) Crystal chemistry and polytypism of tyrolite. American Mineralogist, 91, 1378–1384.CrossRefGoogle Scholar
Lengauer, C.L., Giester, G. and Kirchner, E. (2004) Leogangite, Cu10(AsO4)4(SO4)(OH)6·8H2O, a new mineral from the Leogang mining district, Salzburg province, Austria. Mineralogy and Petrology, 81, 187–201.Google Scholar
Li, Guowu, Shi, Nicheng, Ma, Zhesheng and Xiong, Ming (2005) A new method for powder-like diffractograms of small single crystals using a SMART APEX CCD detector. Acta Mineralogica Sinica, 25, 9–14. [In Chinese, English abstract].Google Scholar
Li, Yi, Lai, Lairen, Zhou, Weining and Qin, Chaoke (2004) Mineralogical characteristics and geological significance of tyrolite. Acta Mineralogica Sinica, 24, 378–380.Google Scholar
Liao, Libing, Ma, Zhesheng and Shi, Nicheng (1996) {001} Surface structure of clinotyrolite revealed by atomic force microscope (AFM). Kexue Tongbao, 41, 341–342. [In Chinese, English pp. 759–761]Google Scholar
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, 134–143. [In Chinese, English abstract].Google Scholar
Mandarino, J.A. (2004) New minerals. The Canadian Mineralogist, 42, 1901–1928.CrossRefGoogle Scholar
Mandarino, J.A. (2007) The Gladstone-Dale compatibility of minerals and its use in selecting mineral species for further study. The Canadian Mineralogist, 45, 1307–1324.CrossRefGoogle Scholar
Mincheva-Stefanova, I. (1968) Strashmirite, a new hydrous copper arsenate. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 97, 470–477.Google Scholar
Sheldrick, G.M. (2008) A short history of SHELX. Acta Crystallographica, A64, 112–122.CrossRefGoogle Scholar
Yang, H., Jenkins, R.A., Downs, R.T., Evans, S.H. and Tait, K.T. (2011) Rruffite, Ca2Cu(AsO4)2·2H2O, a new member of the roselite group, from Tierra Amarilla, Chile. The Canadian Mineralogist, 49, 877–884.CrossRefGoogle Scholar