On the new mineral theophrastite, a nickel hydroxide, from Unst, Shetland, Scotland
- 1 March 1982
- journal article
- Published by Mineralogical Society in Mineralogical Magazine
- Vol. 46 (338) , 1-5
- https://doi.org/10.1180/minmag.1982.046.338.01
Abstract
The new mineral theophrastite, Ni(OH)2, from Unst, is Mg-bearing and occurs associated with a very poorly crystalline Ni-containing mixed hydroxide of the pyroaurite type and/or zaratite on chromitite. X-ray powder diffraction data show a shift in d spacing toward brucite compared with pure Ni(OH)2. Infrared, thermal, chemical, optical, and physical data are presented together with indexed powder data for fifteen lines ranging from d 4.66Å to 0.90Å. The solid-solution series brucite-theophrastite is briefly discussed.Keywords
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