A chromian tourmaline from Swat, West Pakistan
- 1 June 1972
- journal article
- Published by Mineralogical Society in Mineralogical Magazine
- Vol. 38 (298) , 756-759
- https://doi.org/10.1180/minmag.1972.038.298.11
Abstract
Traces of a green chromian tourmaline occur in calcareous rocks in contact with serpentinite near Alpurai, Swat, West Pakistan. The petrography of the rocks and the optical properties of the tourmaline are presented along with its chemistry (it contains over 8 % Cr2O3 and about 0·2 % V2O3). The mineral is compared with other chromian tourmalines and its paragenesis discussed: it is thought to have been produced by silica-rich hydrothermal (or gaseous) solutions, which have crystallized as thin quartz veins in the calcareous rocks, introducing boron and other constituents.Keywords
This publication has 2 references indexed in Scilit:
- Quantitative Electron-probe Microanalysis of Rock-forming MineralsJournal of Petrology, 1969
- A chromian tourmaline from Outokumpu, FinlandBulletin of the Geological Society of Finland, 1968