gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1965.035.272.05 A Note on Varlamoffite and Associated Minerals from the Batang Padang District, Perak, Malaya, Malaysia1 Alexander, J. B. C.B.E., Ph.D., F.G.S. Director Geological Survey, Malaya Flinter B. H. B.Sc. Senior Geologist, Malaya

Compiled from material included in a cyclostyled circular issued by the Director of the Geological Survey, Malaysia, for internal distribution.

 12 1965 35 272 622 627 21 4 1965 Copyright © 1965, The Mineralogical Society 1965 Summary

A new occurrence of varlamoffite is described, and the status of this species is considered; the term is best employed for cryptocrystalline yellowish material consisting predominantly of Sn and H20 that may yield a diffuse powder pattern comparable to, or closely resembling that of cassiterite, but does yield a powder pattern identical with that of cassiterite after heat-treatment at about 1200° C. A new mineral, malayaite, CaSnSiO5, is briefly described; it is isostructural with sphene.