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Graeserite - Buca della Vena Mine, Pontestazzemese, Stazzema, Lucca Province, Tuscany, Italy (#:MINS8998)

Extremely rare Graeserite xls up to 1.5 mm on matrix.

Formula :
Fe³⁺4Ti₃As³⁺O₁₃(OH)
System: monoclinic Hardness:5½ Rarity:extremely rare
Strunz id:IV - OXIDES and HYDROXIDES
Name origin: Named in 1998 by M. S. Krzemnicki and E. Reusser in honor of Dr. Stefan Graeser (1935-), professor at the Mineralogical-Petrographic Institute, University of Basel, Switzerland in recognition of his extensive research on the oxides and sulfosalts of arsenic in the Binntal region of Switzerland.