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Greisen

A rock classification type
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A highly variable, low to high-temperature metasomatic rock characterised by the presence of quartz and white mica, commonly with topaz, fluorite, tourmaline and locally with cassiterite, biotite, zinnwaldite, orthoclase, andalusite and diaspore; some contain various sulphides. Typically greisens may host Be, W, Mo, Sn and Ta mineralization. They are associated with high-level late-orogenic leucogranites or alkali-feldspar granite and form during cooling and exsolution of F-rich fluids as replacements either in the granite body and/or in a wide range of country rocks. Zoning may be present.


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Unique IdentifiersHide

Mindat ID:
48655
Long-form identifier:
mindat:1:1:48655:2

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
TourmalineAD3G6(T6O18)(BO3)3X3Z
Wolframite GroupNote: "Wolframite" usually has a chemical composition covering the range between Hübnerite and ...
ZinnwalditeMica Group.

Synonyms of GreisenHide

Common AssociatesHide

Associations Based on Photo Data:
21 photos of Greisen associated with CassiteriteSnO2
2 photos of Greisen associated with QuartzSiO2
1 photo of Greisen associated with 'Smoky Quartz'SiO2
1 photo of Greisen associated with 'Tin ore'
1 photo of Greisen associated with 'Copper ore'
1 photo of Greisen associated with ChalcopyriteCuFeS2
1 photo of Greisen associated with SpessartineMn2+3Al2(SiO4)3

Internet Links for GreisenHide

References for GreisenHide

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