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Perhamite, a new calcium aluminum silico-phosphate mineral, and a re-examination of viséite

Published online by Cambridge University Press:  05 July 2018

Pete J. Dunn  and
Daniel E. Appleman
Pete J. Dunn
Affiliation:
Department of Mineral Sciences, Smithsonian Institution, Washington, D.C. 20560
Daniel E. Appleman
Affiliation:
Department of Mineral Sciences, Smithsonian Institution, Washington, D.C. 20560
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Summary

A new calcium aluminum silico-phosphate mineral has been found at two locations on Newry Hill, Newry, Maine, U.S.A. Its composition closely approximates to 3CaO.3·5Al2O3.3SiO2.2P2O5.18H2O (Z = 1). Perhamite is uniaxial (+), c = 1577, ω = 1·564, density = 2·64 g/cm3. The mineral is hexagonal, probably P6/mmm, with a = 7·02 Å, c = 20·21 Å. The colour is light brown to white, the habit is as aggregates of discoidal hexagonal crystals. Cleavage is perfect {0001}, the lustre is vitreous, and the streak white. The mineral is named for a pegmatite miner and geologist, Frank C. Perham of West Paris, Maine, U.S.A.

The most similar species is viséite. A re-examination of viséite indicates that the composition previously given is incorrect. A new form of viséite, also from Visé, Liège, Belgium is also examined and found to differ in composition from the type material.

Type
Research Article
Information
Mineralogical Magazine , Volume 41 , Issue 320 , December 1977 , pp. 437 - 442
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1977

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References

Appleman, (D. E.), Evans, (H. J.). and Handwerker, (D. S.), 1972. U.S. Geol. Surv. Contrib. 20, Springfield, Virginia (Nat. Tech. Inform. Serv., Doc. no. PB-2i6i88v).Google Scholar
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Nowacki, (W.), 1967. Crystal data, systematic tables, 2nd edn. A.C.A. Monograph no. 6.Google Scholar