Abstract

The Precambrian rocks of Australia contain a wider variety of davidites than has been found elsewhere in the world. Investigation of davidite occurrences as an economic U ore over a number of years has revealed its many peculiar physical and chemical characteristics. It has been shown to be a primary mineral generally associated with sodium-rich acidic igneous rock as replacement lode deposits, as disseminated replacement deposits, as fissure fillings of pneumatolytic origin and as an accessory mineral in pegmatites. Its association with titania, both as regular and recognizable inclusions of rutile and ilmenite, and as the less apparent sub-microscopic titaniferous "framework", raises the question as to whether the generally accepted description and composition of davidite is valid.

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