Letter | Published:

Fugitive Coloration of Sodalite

Nature volume 74, page 564 (04 October 1906) | Download Citation



WITH reference to the properties of Indian sodalite shown by Mr. T. H. Holland at the York meeting of the British Association (September 27, p. 550), will you permit me to point out that, although not generally noticed in the text-books, the change of colour referred to is not peculiar to the Rajputana mineral. The first sodalite discovered had the same property, and Giesecké, under date August 28, 1806, records the occurrence of “pfirsichblüthenrothfarbene” sodalite from Kangerdluarsuk, in Greenland, “welche die hohe Farbe auf frischem Bruche sogleich beinahe ganz verliert.” The same observation was made independently by Allan (Thomson's “Annals of Philosophy,” 1813, vol. i., p. 104); but I am not aware that there is any record of a recovery of the lost colour, which Mr. Holland appears to have observed.

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  1. Edinburgh, October 1.



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