Formula :
Ca(La,Ce)(Al2Fe2+)(Si2O7)()Si2O4)O(OH)
System: monoclinic Hardness:5-6 Rarity:not common
Strunz id:VIII/C.23-65 -
SILICATES
Name origin: Named in 1810 by Thomas Thomson for Thomas Allan (1777-1833), Scottish mineralogist, who first observed the mineral.
The Levinson rule suffix, -(Ce), was later added to designate this species as the Ce-dominant member among all allanites.
|
