Formula :
Ca6(Cr3+,Al)2[(OH)12/(SO4)3] * 26 H2O
System: hexagonal Hardness:2 Rarity:very rare
Strunz id:VI/D.13-20 -
SULFATES, CHROMATES, MOLYBDATES and TUNGSTATES
Name origin: Named in 1977 by Shulamit Gross in honor of Professor Yaakov K. Ben-Tor [February 13, 1910 Königsberg, East Prussia, Germany - October 29, 2002 La Jolla, California, USA], petrologist and geologist, Scripps Institute of Oceanography, University of California, San Diego, California, USA and Department head of Geology, Hebrew University, Jerusalem, Israel from 1954-1966, for his contributions to the geology and mineralogy of Israel and the Middle East.
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