Abstract
Thalenite occurs as a minor constituent of a single small pegmatite within an extensive area of granite a few miles south of Kingman, Aizona. Crystals are large but not faceted, and it is partly crystalline and partly metamict. The composition of this thalenite corresponds to Y3[Si3O10](OH), with extensive substitution of Y by RE elements, especially Dy, Er and Yb. Upon heating, even at moderate temperatures, both the crystalline and the metamict thalenite are converted to a phase with a structure corresponding to that of thortveitite, Sc2Si2O7.
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