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Hornblende-biotite gneiss from
Birch Portage pegmatites, Jan Lake, Saskatchewan, Canada


Locality type:Pegmatite Field
Classification
Type:Hornblende-biotite gneiss
Comments:The gneisses are typically coarse-grained and porphyroblastic, with large feldspar crystals set in a foliated matrix. They commonly show gradational contacts and local banding or migmatitic features.

Overall, the gneisses represent metamorphosed sedimentary and/or volcanic rocks (paragneisses) formed under amphibolite-facies conditions, providing the main host for the pegmatite dykes
Confirmation
Validity:Believed Valid
Associated Minerals:
Associates:Albite
Amphibole Supergroup
Biotite
Garnet Group
Microcline
Plagioclase
Quartz
Titanite
Tremolite
Data
Mineral Data:Click here to view Hornblende-biotite gneiss data
Locality Data:Click here to view Birch Portage pegmatites, Jan Lake, Saskatchewan, Canada
Data Identifiers
Mindat Occurrence Record ID:1953611
Long-form Identifier:1:3:1953611:8
GUID (UUID V4):0
References
Dennis Radcliffe (1964) THE GEOLOGY OF THE BIRCH PORTAGE BERYL PEGMATITE DEPOSIT, SASKATCHEWAN. Master, University of Alberta, Edmonton, Alberta, Canada.
 
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