Abstract
Chemical, x-ray and thermal analyses together with petrographical data are given for specimens of antigorite from Unst, Shetland Islands. The x-ray powder diagrams are indexed on the basis of an ortho-hexagonal cell and the mineral is therefore named “ortho-antigorite” to distinguish it from the monoclinic varieties hitherto described. Evidence is obtained for a superlattice similar to that described by Aruja. The unit cell contains two structural layers and their relative orientation is probably similar to that of the kaolin-type layers in amesite. Structural formulae are derived.
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