Fluocerite
| Fluocerite-(La) | ||
|---|---|---|
| General | ||
| Category | Mohs scale hardness 4-5 | |
| Luster | Vitreous | |
| Streak | White | |
| Diaphaneity | Transparent to translucent | |
| Density | 5.93 | |
| Birefringence | 0.006 | |
| Fluocerite-(Ce) | ||
|---|---|---|
| General | ||
| Category | Specific gravity 5.93 - 6.14 | |
| Density | 5.93 - 6.14 g/cm3 (Measured) | |
| Birefringence | 0.005 - 0.007 | |
Fluocerite, also known as tysonite, is a mineral consisting of
cerium trifluoride. Both crystallize in the trigonal system.[3]
Fluocerite-(Ce) was first described (without the Ce) in 1845 from
hydrothermal veins in granite in Sweden.[4] Fluocerite-(La) was first described in 1969 from the type locality in central Kazakhstan.[3] The name tysonite was given in 1880 to the same type of mineral found in Colorado.[5][6] Tysonite-type structure is used for rare-earth fluorides with the P3c1 space group structure.[7]
References
- ^ "Fluocerite-(La) Mineral Data". webmineral.com. Retrieved 2021-02-12.
- ^ "Fluocerite-(Ce) Mineral Data". webmineral.com. Retrieved 2021-02-12.
- ^ a b "Fluocerite-(La)". www.mindat.org. Retrieved 2021-02-12.
- ^ "Fluocerite-(Ce)". www.mindat.org. Retrieved 2021-02-12.
- ISSN 0016-786X.
- ^ Allen, Oscar D., and W. J. Comstock. "Bastnaesite and tysonite from Colorado." American Journal of Science 3.113 (1880): 390-393.
- ISBN 978-981-4651-91-2.