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Walter R. Kellogg


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Mineral Specimen #6812    Zussmanite (TL), Stilpnomelane variety: Ferristilpnomelane, Quartz, Pyrite

Laytonville, Mendocino Co., California

7.4 x 3.6 x 4.3 cm
2.9 x 1.4 x 1.7 in


Ex. Steve Pullman

K(Fe,Mg,Mn)13(Si,Al)18O42(OH)14. K(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27

This specimen is composed of layers of Zussmanite interspersed with Stilpnomelane and Quartz, and likely other species. The Zussmanite is dull green in color. This is quite a rare species which is only found in a few places in the world with this, the type location, being the only place where specimens have been available in any quantity. The varietal name, Ferristilpnomelane, refers to a slightly ferrian variety of Stilpnomelane. There are very small Pyrite crystals also present. From the discoloration of the label, this appears to be an older specimen.

Condition: Composed of massive material.

Flaws: Essentially massive material.

This mineral is also found in the following galleries: Minerals From California and Nevada | Phyllosilicates | Rare Minerals | Minerals Priced Between 25 and 49 Dollars