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Kalsilite in venanzite from San Venanzo, Umbria, Italy

  • F. A. Bannister, TH. G. Sahama and H. B. Wuk

Extract

Shortly after the discovery of the mineral kalsilite, the pure potash analogue to nepheline, as a natural mineral occurring in some volcanic ]avas of SW. Uganda by Bannister and Hey, Professor Arthur Holmes suggested that the ncpheline-looking ruineral occurring in a very potash-rich lava at San Venanzo, Umbria, Italy, also might be kalsilitc. His suggestion was based on the high potash : soda ratio of the bulk rock and on the optical properties of the mineral. No X-ray evidence or chemical analysis on the supposed kalsilite has been presented so far.

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page 46 note on 4. Bannister, F. A. and Hey, M. H., Min. Mag., 1942, vol. 26, p. 218 .

page 46 note on 5. Holmes, A., Geol. Mag. Hertford, 1942, vol. 79, p. 225. [M.A. 8-318.]

page 47 note on 1. Rigby, G. R. and Richardson, H. M., Min. Mag., 1947, vol. 28, p. 75 .

1 Keeper of Minerals in the British Museum

2 Professor of Geochemistry. University of Helsinki, Finland

3 Chemist, Geological Survey of Finland, Helsinki

Kalsilite in venanzite from San Venanzo, Umbria, Italy

  • F. A. Bannister, TH. G. Sahama and H. B. Wuk

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