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Walter R. Kellogg

 

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Mineral Specimen #6814    Stilpnomelane variety: Ferristilpnomelane, Zussmanite (TL), Quartz

Laytonville, Mendocino Co., California

Type Location

11.2 x 9.3 x 4.8 cm
4.4 x 3.7 x 1.9 in

$45      Click here to order this mineral.                                                                                                                                                              

Ex. Steve Pullman

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


The surface of this specimen is composed primarily of Stilpnomelane which in places is a brown color with a slight reddish tint and has a very high luster. The varietal name, Ferristilpnomelane, refers to a slightly ferrian variety. There are very minor amounts of Zussmanite present which is a dull green color which 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.

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

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