… matite i:as been studied as background to the setting of the simpsonite par- … Canon:ca1
variable histogram for microli:es from simpsonitebearing versus simpsonite-free associa:ions …

A study of the Alto do Giz, near Equador, Rio Grande do Norte, Brazil, reveals an interesting
series of tantalum minerals including the rare aluminum tantalate, simpsonite. Crystals of …

… and several tons of tantalite and simpsonite concentrates have been exported to America. …
The discovery of simpsonite in a more consistent body has somewhat improved the working …

… a background study to the setting of the simpsonite paragenesis, and shows that enrichment
… of the simpsonite paragenesis. Crystallization histories of all occurrences of the simpsonite …

… Optical, chemical, and powder X-ray data are given and the formula of simpsonite is considered
; a new formula is proposed. … The first find of simpsonite in Southern Rhodesia was from …

… simpsonite, and in some instances the simpsonite is replaced. The Brazilian and African
specimens are apparently more nearly pure simpsonite … The formula of simpsonite is believed to …

… simpsonite) [16, 17], which has not only interplanar spacings but also peak intensities identical
to those of the phase in question. Simpsonite … , the formula of simpsonite can be written as …

… The examination of simpsonite was prompted by a … The present study of simpsonite from
seven of its nine known … Optically uniaxial negative, simpsonite has a hardness of 7th, an (<o) in …

… At about this time, during a systematic study of simpsonite, we encountered a mineral …
Close inspection of other samples procured for the simpsonite study reveals a third locality …

The crystal structure of alumotantite; its relation to the structures of simpsonite and the (Al,Ga)(Ta,Nb)O
4 compounds | The Canadian Mineralogist | GeoScienceWorld …