Abstract
A tabular zircon, with dominant {001} pinacoid, was observed in the sodium-rich pyroxene syenites of the Meponda alkaline complex, Mozambique. Comparison of its morphology with those of zircon crystals from several alkaline granites — Cameroun, Nigerian Air, Corsica — as well as with the morphology of some artificial crystals, seems to point out that the {001} form would preferentially develop in alkaline magmas with an agpaitic trend and where Si and Na play an important part.
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