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Dwornikite, (Ni,Fe)SO4 · H2O, a member of the kieserite group from Minasragra, Peru

Published online by Cambridge University Press:  05 July 2018

Charles Milton ,
Howard T. Evans Jr.  and
Robert G. Johnson
Charles Milton
Affiliation:
US Geological Survey and George Washington University
Howard T. Evans Jr.
Affiliation:
US Geological Survey, National Center 959, Reston, Virginia 22092, USA
Robert G. Johnson
Affiliation:
US Geological Survey, National Center 959, Reston, Virginia 22092, USA
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Abstract

Dwornikite, (Ni1−xFex)SO4 · H2O is a member of the kieserite group, monoclinic with space group C2/c. Specimens from Minasragra, Peru with x ∼ 0.1 have a unit cell with a = 6.839(2), b = 7.582(2), c = 7.474(2) Å, and β = 117.85(2)°. The six strongest lines of the powder pattern are: 3.342 (12, 100), 4.732 (110, 70), 3.024 (200, 70), 4.754 (11, 50), 3.293 (021, 35), 2.491 (022, 35). The mineral occurs as fine grained white aggregates associated with vanadium sulphide ores containing patronite and bravoite, mixed with other oxidation products. New unit cell data for the synthetic end-member compounds NiSO4 · H2O and FeSO4 · H2O, and new X-ray powder data for retgersite (NiSO4 · 6H2O) are provided.

Type
Research Article
Information
Mineralogical Magazine , Volume 46 , Issue 340 , September 1982 , pp. 351 - 355
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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