The Amygdale Minerals in the Tertiary Lavas of Ireland. IV. The Crystal Habit of Calcite

G. P. L Walker

Dept. of Geology, Imperial College, London S.W. 7

Summary: Calcite is widespread in amygdales associated with the zeolites; the characteristic forms being {022¯1} and a steep scalenohedron in the zone [1¯101], usually {13.11.24¯.2}. Crystals from one locality have faces of {16.1.17¯.0}, a form new to calcite.

Mineralogical Magazine; December 1960 v. 32; no. 251; p. 609-618; DOI: 10.1180/minmag.1960.032.251.02
© 1960, The Mineralogical Society
Mineralogical Society (www.minersoc.org)