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Greisen

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A medium-temperature metasomatic rock characterized by the presence of quartz and white mica, commonly with topaz, fluorite, tourmaline and locally with amazonite, orthoclase, andalusite and diaspore. Typically greisens may host Be, W, Mo, Sn and Ta mineralization. They are associated with high-level late-orogenic leucogranites and form as replacements either in the granite body and/or in a wide range of country rocks. Zoning may be present.


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Classification of GreisenHide

Sub-divisions of GreisenHide

Mineralogy of GreisenHide

Essential minerals - these are minerals that are required within the classification of this rock:
MicaA petrological term for Mica Group.
Silica > QuartzSiO2
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
AmazoniteK(AlSi3O8)
AndalusiteAl2(SiO4)O
CassiteriteSnO2
DiasporeAlO(OH)
Feldspar > Alkali Feldspar > OrthoclaseK(AlSi3O8)
FluoriteCaF2
Mica > MuscoviteKAl2(AlSi3O10)(OH)2
MolybdeniteMoS2
TopazAl2(SiO4)(F,OH)2
TourmalineA(D3)G6(T6O18)(BO3)3X3Z
Wolframite(Fe2+)WO4 to (Mn2+)WO4
ZinnwalditeKLiFe2+Al(AlSi3O10)(F,OH)2

References for GreisenHide

Reference List:
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Fettes (et al.), Metamorphic Rocks - A Classification and Glossary of Terms (2007) Cambridge University Press

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