A Reinterpretation of Monalbite

William L. Brown1
Department of Geology, The University, Manchester 13
1Present address: Laboratoire de Minéralogie et Cristallographie, 1 rue Victor-Cousin, Paris 5e France.

Summary: A neutron activation analysis of one of the crystals of ‘monalbite’, which was monoclinic at room temperature, shows that it contains a large proportion of potassium. It is thus not a polymorph of pure NaAlSi3O8. The contamination occurred by transfer of K through the atmosphere of the furnace from potassium-bearing ceramic materials.

Mineralogical Magazine; March 1967 v. 36; no. 277; p. 80-82; DOI: 10.1180/minmag.1967.036.277.12
© 1967, The Mineralogical Society
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