Genthelvite and the Helvine Group

Pete J. Dunn
Dept. of Mineral Sciences, Smithsonian Institution, Washington, D.C. 20560, U.S.A.

Summary: A plot of seventy-five new analyses of members of the helvine group and fifty-seven analyses from the literature indicates complete miscibility between the Fe and Zn members (danalite and helvine) and between the Fe and Mn members (danalite and genthelvite). The new analyses include essentially pure helvine and genthelvite (for both of which X-ray data are presented) and the nearest approach to pure danalite (86 at. % Fe). Two new localities for genthelvite, the rarest member, are reported.

Mineralogical Magazine; June 1976 v. 40; no. 314; p. 627-636; DOI: 10.1180/minmag.1976.040.314.10
© 1976, The Mineralogical Society
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