Formula :
Na2(Mg,Fe2+)3(Al,Fe3+)2[OH/Si4O11]2
System: monoclinic Hardness:6 Rarity:not common
Strunz id:VIII/F.8-30 -
SILICATES
Name origin: Named in 1894 by Charles Palache for Charles Whitman Cross [September 1, 1854 Southampton near Amherst, Massachusetts - April 20, 1949 Chevy Chase, Maryland]. Cross was a petrologist the the United States geological Survey and was widely regarded as the greatest field petrologist of his generation. He was important in classifying igneous rocks, etc.-
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