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Mineralpedia Details for Mountkeithite

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Mountkeithite

Mountkeithite

Named for the Mount Keith deposit in Western Australia, Australia which is the type locality for the mineral. At the type locality, Mountkeithite occurs “in a vein in serpentinite in a disseminated nickel sulfide deposit [that was formed by low-temperature alteration of stichtite by sulfate-rich solutions.” This rare mineral occurs only in Australia and at a newer locality in California, USA.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/mountkeithite.pdf

Formula
Mg11Fe3+3(SO4)3.5(OH)24ยท11H2
Crystal System
Hexagonal 
Crystal Habit
Flakes, Granular, Rosette 
Cleavage
Perfect, None, None 
Luster
Pearly 
Color
white, light pink 
Streak
white 
Class
Hexagonal 
Hardness
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Mountkeithite from Mount Keith mine, Mt. Keith, Western Austrialia, Australia

Mountkeithite
            from Mount Keith mine, Mt. Keith, Western Austrialia, Australia

Rose pink soft, platy aggregates as grains to 1mm as an alterations in nickel rich Serpentinized matrix associated with excellent micro crystals of Magnetite.

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