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Wupatkiite from the Cameron Uranium District, Arizona, a new member of the halotrichite group

Published online by Cambridge University Press:  05 July 2018

Sidney A. Williams  and
Fabien P. Cesbron
Sidney A. Williams
Affiliation:
Globo de Plomo, Box 872, Douglas AZ 85608, USA
Fabien P. Cesbron
Affiliation:
LEMI-ESEM, Rue Leonardo de Vinci, 45072 Orleans Cedex 2, France
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Abstract

Wupatkiite (Co,Mg,Ni)Al2(SO4)4.22H2O is a new member of the halotrichite group. It occurs 8 miles ESE of Gray Mountain, Arizona, near the prehistoric pueblo dwelling Wupatki. It occurs as cross-fibre veinlets with fibres up to 8mm long. Colour: empire rose (RHS48C), streak white, H. = 1 ½. G = 1.92, D(calc) = 1.87g/cm3. Nonpleochroic with α = 1.477, γ = 1.484, Z^fibre axis = 12°. Wet chemistry gave MgO 1.63, CaO 0.10, MnO 0.17, FeO 0.15, NiO 0.52, CuO 0.12, CoO 3.41, Al2O3 11.30, SO3 35.97, H2O 42.26 (total 95.63%); rem. = montmorillonite and quartz. Parameters refinedo from the powder pattern are close to those of halotrichite. Wupatkiite is monoclinic P21/c with a = 6.189 Å, b = 24.23 Å, c = 21.20 Å, β = 100.33°. Strongest lines are 4.790, 100 (024); 4.295, 27 (140); 3.945, 26 (025); 3.768, 33 (062); 3.494, 92 (124, 063).

Keywords

wupatkiitehalotrichitenew mineralGray MountainArizona
Type
Mineralogy
Information
Mineralogical Magazine , Volume 59 , Issue 396 , September 1995 , pp. 553 - 556
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1995

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References

Austin, S.R. (1964) Mineralogy of the Cameron Area, Coconino County, Arizona. U.S. Atomic Energy Comm. RME-99, Tech. Inf. Serv., Oak Ridge, 99.Google Scholar
Dubanskỳ, A. (1956) PZispevky K Poznani geochemie sekundarnich sulfatu III, Sulfaty z Dubniku u PreSova. Chem. hasty Praha, 50, 1347–61.Google Scholar