Bernardino Rivadavia (1780-1845). (Who's who in mineral names).(Rivadavite)(Biography)

Rocks & Minerals | January 1, 2003| | Copyright

Rivadavite, [Na.sub.6]Mg[B.sub.24][O.sub.40]*22[H.sub.2]O, was first described from the Tinealayu borax deposit, Salar del Hombre Muerto (Salt Pan of the Dead Man), Salta Province, Argentina (Hurlbut and Aristarian 1967), where it occurs as nodular aggregates of bladed monoclinic crystals, to 3 mm in length, embedded in borax. The crystals are colorless, show excellent {100} and {[bar]111} cleavage, and are extremely brittle. The mineral has a hardness of 3.5 and a specific gravity of 1.905. It has also been found in the Furnace Creek district, Inyo County, California.

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