stilpnomelane


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stilpnomelane

[‚stilp·nō′me‚lān]
(mineralogy)
K(Fe,Mg,Al)3Si4O10(OH)2·H2O A black or greenish-black mineral composed of basic hydrous potassium iron magnesium aluminum silicate; occurs as fibers, incrustations, and foliated plates.
References in periodicals archive ?
Stilpnomelane and biotite: K-bearing phases other than white mica and K-feldspar were only observed in FO0016.
Referring to this temperature, metamorphic pressures could have been elevated due to the assemblage phengite + stilpnomelane.
Associated minerals are: rhodochrosite, friedelite, hubnerite, sphalerite, stilpnomelane, albite, barite, hausmannite, tephroite, welinite and an unidentified manganese vanadate.
Stilpnomelane as a mineral of the Ural Mountain Alpine clefts was first discovered at Puiva.
In the course of this process, cavities were generated, in which actinolite, stilpnomelane, quartz, ilvaite and other minerals crystallized.