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stilpnomelane

A phyllosilicate (sheet silicate) similar to biotite with the formula (K,Na,Ca)0–1.4 (Fe2+,Fe3+,Mg,Al,Mn)5.9–8.2 [Si8O20] (OH)4(OH,F)3.6–8.5; sp. gr. 2.59–2.96; hardness 3.0–4.0; ...

stilpnomelane

stilpnomelane   Quick reference

A Dictionary of Geology and Earth Sciences (5 ed.)

Reference type:
Subject Reference
Current Version:
2020

... A phyllosilicate (sheet silicate) similar to biotite with the formula (K,Na,Ca) 0–1.4 (Fe 2+ ,Fe 3+ ,Mg,Al,Mn) 5.9–8.2 [Si 8 O 20 ] (OH) 4 (OH,F) 3.6–8.5 ; sp. gr. 2.59–2.96; hardness 3.0–4.0; properties similar to those of biotite; found in metamorphosed iron- and manganese-rich sedimentary deposits and in some glaucophane...

stilpnomelane

stilpnomelane  

A phyllosilicate (sheet silicate) similar to biotite with the formula (K,Na,Ca)0–1.4 (Fe2+,Fe3+,Mg,Al,Mn)5.9–8.2 [Si8O20] (OH)4(OH,F)3.6–8.5; sp. gr. 2.59–2.96; hardness 3.0–4.0; properties similar ...
micas

micas  

An important group of phyllosilicates (sheet silicates) with a 2:1 atomic structure (see clay minerals) and including the important minerals muscovite, biotite, and phlogopite; the group is ...
micas

micas   Quick reference

A Dictionary of Geology and Earth Sciences (5 ed.)

Reference type:
Subject Reference
Current Version:
2020

...(K,Na) 2 Y 6 [Z 4 O 10 ] 2 (OH,F) 4 , where Y = Mg, Fe, Fe 3+ , or Al, and Z = Si or Al; the micas include the common micas already mentioned, plus glauconite , lepidolite , and zinnwaldite , the brittle micas ( see margarite ), and also the related minerals talc , stilpnomelane , and pyrophyllite...

banded iron formations

banded iron formations   Reference library

The Oxford Companion to the Earth

Reference type:
Subject Reference
Current Version:
2003

...different mineralogical types: (1) oxide iron formation, containing haematite, magnetite, and chert; (2) carbonate iron formation containing siderite, ferro-dolomite, and calcite; (3) silicate iron formation, containing the hydrous iron-silicates greenalite, minnesotaite, stilpnomelane, chlorite, and amphibole; and (4) sulphide iron formation, containing pyrite. Over time, the banded iron formations have experienced variable degrees of metamorphism, which has modified the original mineralogy to differing degrees. This makes it difficult to determine...

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