This arrangement of mineral species is based on Dana's New Mineralogy by Richard
V. Gaines, H. Catherine Skinner, Eugene E. Foord, Brian Mason, and Abraham Rosenzweig,
with sections by Vandall T. King, Illustrations by Eric Dowty, (ISBN: 047119310-0)
Copyright © 1997, John Wiley & Sons, Inc.".
This material is used by permission of John Wiley & Sons, Inc.
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28.04.04 Langbeinite Series
28.04.04.01 Langbeinite K2Mg2(SO4)3 P 213 2 3
28.04.04.02 Manganolangbeinite K2Mn2(SO4)3 P 213 2 3
28.04.04.03 Efremovite (NH4)2Mg2(SO4)3 P 213 2 3