(The new mineral tolbachite, CuCl2.

L. B. Bergasova, S. K. Filatov

Research output

13 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)415-417
Number of pages3
JournalDoklady Akademii nauk SSSR
Publication statusPublished - 1 Jan 1983

Scopus subject areas

  • Engineering(all)

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