The optical orientation of labradorite from County Down (Ireland) determined by the Fedorov Method
- 1 September 1928
- journal article
- Published by Mineralogical Society in Mineralogical Magazine and Journal of the Mineralogical Society
- Vol. 21 (122) , 543-551
- https://doi.org/10.1180/minmag.1928.021.122.02
Abstract
Labradorite of exceptional purity, occurring as phenocrysts in two basaltic dikes just below the lighthouse at St. John's Point, Ardglass, County Down, Northern Ireland, was described by Professor A. Hutchinson and myself in 1912. The refractive indices for sodium-light were determined on an Abbé-Pulfrich total-reflectometer. Carefully selected material was analysed by Mr. G. G. Knighton and by Mr. M. C. Burkitt, and the specific gravity of the material analysed was determined.Keywords
This publication has 2 references indexed in Scilit:
- Optical dispersion of three intermediate plagioclasesMineralogical Magazine and Journal of the Mineralogical Society, 1923
- On Sericite from North Wales and on Penninite and Labradorite from IrelandMineralogical Magazine and Journal of the Mineralogical Society, 1912