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(The new mineral tolbachite, CuCl2. / Bergasova, L. B.; Filatov, S. K.
In: Doklady Akademii nauk SSSR, Vol. 270, 01.01.1983, p. 415-417.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - (The new mineral tolbachite, CuCl2.
AU - Bergasova, L. B.
AU - Filatov, S. K.
PY - 1983/1/1
Y1 - 1983/1/1
N2 - Tolbachite occurs as one of the principal Cu minerals accompanying exhalations of the large fractures of the Tolbachin basaltic eruption in the Kurile-Kamchatka volcanic field. It was formed at 300o-350oC in incrustations of fumaroles and secondary slag cones, together with melanthallite, dolerophanite, tenorite, euchlorine, chalcokyanite and a K-Cu basic sulphate chloride. It is unstable in air, becoming hydrated to eriochalcite, CuCl2.2H2O. On fresh fractures of the fumarolic incrustations, tolbachite is found as a tangled fibrous deposit of golden brown colour with a pearly lustre; the average size of the crystals is 2 X 0.02 mm. In transmitted light it shows distinct pleochroism from pale green perpendlar elongation to reddish brown parallel elongation; birefringence high (refr. ind. not determined as the mineral reacts with the liquids). Indexed XRD data are tabulated; strongest lines 5.76(100), 2.915(35), 3.445(25) A; a 6.89, b 3.31, c 6.82 A, beta 122.3o; D 3.42 g/cm3. Chemical analysis of an aqueous extract indicates, after deduction of impurities, a composition corresponding with CuCl1.96, or ideally CuCl2. (From translation by M. Fleischer)-R.A.H.
AB - Tolbachite occurs as one of the principal Cu minerals accompanying exhalations of the large fractures of the Tolbachin basaltic eruption in the Kurile-Kamchatka volcanic field. It was formed at 300o-350oC in incrustations of fumaroles and secondary slag cones, together with melanthallite, dolerophanite, tenorite, euchlorine, chalcokyanite and a K-Cu basic sulphate chloride. It is unstable in air, becoming hydrated to eriochalcite, CuCl2.2H2O. On fresh fractures of the fumarolic incrustations, tolbachite is found as a tangled fibrous deposit of golden brown colour with a pearly lustre; the average size of the crystals is 2 X 0.02 mm. In transmitted light it shows distinct pleochroism from pale green perpendlar elongation to reddish brown parallel elongation; birefringence high (refr. ind. not determined as the mineral reacts with the liquids). Indexed XRD data are tabulated; strongest lines 5.76(100), 2.915(35), 3.445(25) A; a 6.89, b 3.31, c 6.82 A, beta 122.3o; D 3.42 g/cm3. Chemical analysis of an aqueous extract indicates, after deduction of impurities, a composition corresponding with CuCl1.96, or ideally CuCl2. (From translation by M. Fleischer)-R.A.H.
UR - http://www.scopus.com/inward/record.url?scp=0021063994&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0021063994
VL - 270
SP - 415
EP - 417
JO - ДОКЛАДЫ АКАДЕМИИ НАУК
JF - ДОКЛАДЫ АКАДЕМИИ НАУК
SN - 0869-5652
ER -
ID: 53958275