Subject ASC0000zld
The Quarterly journal of the Geological Society of London.
v.59 (1903), (1903)
Smithsonian Libraries
BHL Page 41497434
Keywords
geology microscopic view rock Obsidian Cliff crystals porous spherulites Cadhat Plains Sokotra spherulitic structure quartz felspar quartz-felsite crossed nicols Tan-y-macs Caernarvonshire felspar-crystals matrix of the rock micrographic speckled Girgha range Hadibu Plain structure root-like Corriegills shore Isle of Arran pitchstone rocks igneous glassy microscopic devitrification