Formula :
Sr[B6O_9_(OH)2] * 3 H2O
System: monoclinic Hardness:2½ Rarity:rare
Strunz id:V/K.6-20 -
NITRATES, CARBONATES and BORATES
Name origin: Named by R.C. Erd, V. Morgan, and J.R. Clark in 1961 in honor of George Gerard Tunell, Jr. (4 April 1900, Chicago, Illinois, USA - 4 July 1996, Montecito, California, USA), professor of geochemistry, University of California. President of the Mineralogical Society of America (1950) and Roebling Medal recipient in 1973. He made major advances in X-ray crystallography, physical chemistry, and thermodynamic analysis of minerals, especially metallic ores.
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