An occurrence of monazite in Puumala, eastern Finland
A monazite occurrence consisting of three monazite-bearing biotite-rich veins is described. The veins have pegmatitic affinities but are very inhomogeneous. They are located in Precambrian migmatitic cordierite-garnet gneiss or between gneiss and pegmatite. In biotite-rich accumulations the monazite...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Geological Society of Finland
1969-12-01
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| Series: | Bulletin of the Geological Society of Finland |
| Online Access: | http://www.geologinenseura.fi/bulletin/Volume41/sgs_bt_041_pages_117_124.pdf |
| Summary: | A monazite occurrence consisting of three monazite-bearing biotite-rich veins is described. The veins have pegmatitic affinities but are very inhomogeneous. They are located in Precambrian migmatitic cordierite-garnet gneiss or between gneiss and pegmatite. In biotite-rich accumulations the monazite content may be about 10 volume per cent. The chemical analysis, unit cell dimensions, optical properties, magnetic susceptibility and specific gravity of monazite are presented. A comparison is made with monazite deposits of migmatite type.
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| ISSN: | 0367-5211 1799-4632 |