Abstract
Thomsonite was first recognized by H. J. Brooke (1820) in a JL study of the mesotypes or 'needlestones'. The 'needlestone' of Lochwinnoch and Old Kilpatrick, Dumbartonshire, was found to be an independent species, in addition to the natrolite, mesolite, and scolecite into which k. F. Gehlen and J. N. Fachs, and J. N. Fuchs, had divided the mesotype of R. J. Haüy. The new species was named thomsonite, in honour of Dr. T. Thomson, who analysed the material a few months later.

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