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.
Unique Identifiers
Mindat ID:
48655
Long-form identifier:
mindat:1:1:48655:2
GUID
(UUID V4):
(UUID V4):
2fc62e54-6d27-458c-99bf-5fa12662d71a
Classification of Greisen
Sub-divisions of Greisen
- Greisen
Mineralogy of Greisen
Essential minerals - these are minerals that are required within the classification of this rock:
Mica | A petrological term for Mica Group. |
Silica > Quartz | SiO2 |
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Amazonite | K(AlSi3O8) |
Andalusite | Al2(SiO4)O |
Cassiterite | SnO2 |
Diaspore | AlO(OH) |
Feldspar > Alkali Feldspar > Orthoclase | K(AlSi3O8) |
Fluorite | CaF2 |
Mica > Muscovite | KAl2(AlSi3O10)(OH)2 |
Molybdenite | MoS2 |
Topaz | Al2(SiO4)(F,OH)2 |
Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
Wolframite Group | Note: "Wolframite" usually has a chemical composition covering the range between Hübnerite and ... |
Zinnwaldite | Mica Group. |
Synonyms of Greisen
Common Associates
Associated Minerals Based on Photo Data:
3 photos of Greisen associated with Cassiterite | SnO2 |
1 photo of Greisen associated with Tin ore | |
1 photo of Greisen associated with Copper ore | |
1 photo of Greisen associated with Chalcopyrite | CuFeS2 |
1 photo of Greisen associated with Quartz | SiO2 |
1 photo of Greisen associated with Spessartine | Mn2+3Al2(SiO4)3 |
Internet Links for Greisen
mindat.org URL:
https://www.mindat.org/min-48655.html
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