Abstract
The alkalic granites here considered all consist Of the same mineral suite - perthite, quartz, riebeckite, albite and biotite. Strong reactions (probably due to introduction of hydrothermal silica and molybdenum) in the contact zones replace the soda feldspar by albite and the riebeckite by quartz; such zones also include comparatively large quantities of fluorite, zircon and metal sulfides.
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