Cannonite and leguernite from Bukuka deposit, Transbaikalia

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Marco E. Ciriotti
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Cannonite and leguernite from Bukuka deposit, Transbaikalia

Messaggio da Marco E. Ciriotti » mar 13 lug, 2021 15:01

Referenza:
▪ Kasatkin, A., Škoda, R., Chuaknov, N.V. (2020): On restudy of mineral specimens from museum collections. II. Cannonite and leguernite from Bukuka deposit, Transbaikalia. New Data on Minerals, 54, 53–60.

Abstract:
Rare bismuth sulfates cannonite Bi2O(SO4)(OH)2 and leguernite Bi12.67O14(SO4)5 have been identified by us as a result of the restudy of the samples of bismuthinite from Bukuka tungsten deposit (Eastern Transbaikalia, Russia), deposited in the systematic collection of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow under catalogue number 56077. Both minerals are intimately intergrown in polymineral pseudomorphs after bismuthinite forming veins up to 4 cm long and up to 0.5 cm thick. Empirical formulae are as follows: cannonite Bi2.06S0.97O5(OH)2, leguernite Bi12.67S5.00O34. The monoclinic unit-cell dimensions are: cannonite: a = 7.691(1), b = 13.874(2), c = 5.6569(8) Å, β = 109.23(1)°, V = 569.90(9) ų and Z = 4; leguernite: a = 11.197(2), b = 5.714(1), c = 11.879(2) Å, β = 99.37(2)°, V = 749.9(2) ų and Z = 1. Frequencies of strong bands in Raman spectra are for cannonite: 111, 121, 144, 184, 221, 318, 437, 450, 560, 619, 983, 1059, 3439 cm–1, for leguernite: 150, 183, 216, 313, 474, 969 cm–1. Both minerals are found for the first time in Russia.
Marco E. Ciriotti

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