tysonite - meaning and definition. What is tysonite
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What (who) is tysonite - definition

HALITE MINERAL
Tysonite

Tysonite         
·noun A fluoride of the cerium metals occurring in hexagonal crystals of a pale yellow color. ·cf. Fluocerite.
Fluocerite         
·noun A fluoride of cerium, occuring near Fahlun in Sweden. Tynosite, from Colorado, is probably the same mineral.

Wikipedia

Fluocerite

Fluocerite, also known as tysonite, is a mineral consisting of cerium and lanthanum fluorides, with the chemical formula (Ce,La)F3. The end members are classified as two different mineral types depending on the cation, fluocerite-(Ce) and fluocerite-(La), corresponding respectively to lanthanum trifluoride and cerium trifluoride. Both crystallize in the trigonal system.

Fluocerite-(Ce) was first described (without the Ce) in 1845 from hydrothermal veins in granite in Sweden. Fluocerite-(La) was first described in 1969 from the type locality in central Kazakhstan. The name tysonite was given in 1880 to the same type of mineral found in Colorado. Tysonite-type structure is used for rare-earth fluorides with the P3c1 space group structure.