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| - Zussmanite K(Fe++,Mg,Mn)13[AlSi17O42](OH)14 is a hydrated iron-rich silicate which was found in 1960 by Stuart Olof Agrell, in the Laytonville quarry, Mendocino County, California. Zussmanite is named in honor of Jack Zussman, Head of the University of Manchester’s Department of Geology and co-author of Rock-Forming Minerals, a bible for mineralogists. Zussmanite is found as a pale green crystal with perfect cleavage. In the Laytonville quarry, Zussmanite occurs in metamorphosed shales, siliceous ironstones and impure limestones of the Franciscan Formation. It is a location of high pressure and low temperatures where blueschist-facies metamorphic rocks occur. This is also the locality in which Deerite and Howieite were also first discovered. This type of locality also produces micas, which
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| dbkwik:ceramica/pr...iPageUsesTemplate
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| - Sub-Vitreous, resinous, greasy
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| abstract
| - Zussmanite K(Fe++,Mg,Mn)13[AlSi17O42](OH)14 is a hydrated iron-rich silicate which was found in 1960 by Stuart Olof Agrell, in the Laytonville quarry, Mendocino County, California. Zussmanite is named in honor of Jack Zussman, Head of the University of Manchester’s Department of Geology and co-author of Rock-Forming Minerals, a bible for mineralogists. Zussmanite is found as a pale green crystal with perfect cleavage. In the Laytonville quarry, Zussmanite occurs in metamorphosed shales, siliceous ironstones and impure limestones of the Franciscan Formation. It is a location of high pressure and low temperatures where blueschist-facies metamorphic rocks occur. This is also the locality in which Deerite and Howieite were also first discovered. This type of locality also produces micas, which have a similar structure as Zussmanite. Some investigations as to the stability of Zussmanite have been performed to get an idea of end members and the pressure-temperature stability range.
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