Gmelinite and Herschelite from the Ilímaussaq Intrusion in South Greenland

S. Karup-Møller
Institut for Petrologi, Øster Voldgade 5-7, DK-1350, København K, Danmark

Summary: Hypogene alteration of ussingite from the southern part of the Ilímaussaq intrusion in South Greenland has resulted in the formation of three associations: gmelinite-apophyllite, gmelinite-herschelite-earthy-natrolite, and earthy natrolite alone. Ossingite reacted with late magmatic fluids, producing the secondary minerals either by in situ replacement of the ussingite or in cavities, which may be up to 3 cm across.

Mineralogical Magazine; December 1976 v. 40; no. 316; p. 867-873; DOI: 10.1180/minmag.1976.040.316.08
© 1976, The Mineralogical Society
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