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Ferristilpnomelane

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Big Photo

Sterling mine, Antwerp, Jefferson Co., New York, USA
© C. Stefano '08

Show Ferristilpnomelane Photos (2)



Formula:
K(Fe
3+
 
,Mg,Fe
2+
 
)
 
8
(Si,Al)
 
12
(O,OH)
 
27
Colour:Greenish brown to dark ...Hardness:3 - 3½
A variety of Stilpnomelane

An unnecessary name given by Alexander N. Winchell in 1951 for a ferrian stilpnomelane, but sometimes mistaken as an attempt to rename ferric-rich stilpnomelane.

Classification of Ferristilpnomelane

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Physical Properties of Ferristilpnomelane

Lustre:Sub-Vitreous, Greasy
Diaphaneity (Transparency):Transparent, Translucent
Colour:Greenish brown to dark greenish brown or black
Streak:Dark greenish brown
Hardness (Mohs):3 - 3½
Tenacity:Flexible
Cleavage:Perfect
{001}
Fracture:Micaceous

Chemical Properties of Ferristilpnomelane

Formula:
K(Fe
3+
 
,Mg,Fe
2+
 
)
 
8
(Si,Al)
 
12
(O,OH)
 
27
Essential elements:Fe, K, O, Si
All elements listed in formula:Al, Fe, H, K, Mg, O, Si

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Ferristilpnomelane

Reference List:

- +
Winchell, Alexander N., 1951, Optical Mineralogy, fourth edition, part 2, p. 390.

Internet Links for Ferristilpnomelane

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    • Localities for Ferristilpnomelane

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Tajikistan
     
    • Region of Republican Subordination
      • Tien Shan Mts
        • Alai (Alayskiy) Range
    		V.A. Karpenko data
    USA
     
    • California
      • Mendocino Co.
        • Coastal Range
          • Laytonville
    		Chesterman, C.W. (1966b), Mineralogy of the Laytonville quarry, Mendocino County, California, in: Geology of Northern California: California Division Mines & Geol. Bulletin 190: 506; Rice, S.J. (1966) A new mineral locality. California Division of Mines and Geology Mineral Information Service: 19: 7; Onucki, H. and Ernst, W.G. (1969) Coexisting sodic amphiboles and sodic pyroxenes from blueschist facies metamorphic rocks. Mineralogical Association of America Special Paper 2: 242; Pemberton, H. Earl (1983), Minerals of California: 432.
    • Colorado
      • La Plata Co.
        • Durango Area
    		Minerals of Colorado (1997) E.B. Eckels
    • New Jersey
      • Sussex Co.
        • Franklin Mining District
    		Dunn(1995):Pt4:472.
    • New York
      • Jefferson Co.
        • Antwerp
    		Mineralogical Record: 15(4): 199-216.
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