Hostname: page-component-7bb8b95d7b-l4ctd Total loading time: 0 Render date: 2024-09-25T19:18:48.058Z Has data issue: false hasContentIssue false
  • English
  • Français

Caratiite, a potassium, new sulphate-chloride of copper and from the lavas of the 1869 Vesuvius eruption

Published online by Cambridge University Press:  05 July 2018

A. M. Clark ,
E. E. Fejer  and
A. G. Couper
A. M. Clark
Affiliation:
Department of Mineralogy, British Museum (Natural History), Cromwell Road, London SW7 5BD
E. E. Fejer
Affiliation:
Department of Mineralogy, British Museum (Natural History), Cromwell Road, London SW7 5BD
A. G. Couper
Affiliation:
Department of Mineralogy, British Museum (Natural History), Cromwell Road, London SW7 5BD
Get access Rights & Permissions [Opens in a new window]

Abstract

Caratiite is a sulphate-chloride of potassium and copper with ideal formula K4Cu4O2(SO4)4MeCl (where Me = Na and/or Cu); it formed as fine green acicular crystals in lava of the 1869 eruption of Mt. Vesuvius, Naples, Italy. Caratiite is tetragonal, space group I4; a 13.60(2), c 4.98(1) Å, Z = 2. The strongest lines of the powder pattern are [d Å, I, hkl]: 9.61 100 (110); 6.80 80 (200); 4.296 60 (310); 3.015 100b (420,321); 2.747 70 (411); 2.673 60 (510); 2.478 60 (002); 2.388 70 (431,501); 2.281 60 (600). The mineral is uniaxial positive, ω 1.598, ɛ 1.711; it does not fluoresce under either short- or long-wavelength ultra-violet light. The specific gravity is 3.0 (meas.) and 3.22 (calc.).

Type
Research Article
Information
Mineralogical Magazine , Volume 48 , Issue 349 , December 1984 , pp. 537 - 539
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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

Effenberger, H., and Zemann, J. (1984) Mineral. Mag. 48, 541–6.CrossRefGoogle Scholar
Scacchi, E. (1884) Contribuzioni Mineralogiche, Naples, p. 10.Google Scholar