Devitrification of Cracked and Brecciated Obsidian

Grenville A. J. Cole

Professor of Geology in the Royal College of Science, Dublin

Mineralogical Magazine; December 1891 v. 9; no. 44; p. 272-274; DOI: 10.1180/minmag.1891.009.44.02
© 1891, The Mineralogical Society
Mineralogical Society (www.minersoc.org)