Formula: (Ca3REE)[(H2O)2Ca0.5☐0.5]Ti(Si2O7)2(OH)2(H2O)2
Sorosilicate (Si2O7 groups), rinkite group
Specific gravity: 3.2 to 3.4
Hardness: 4 to 5
Streak: Pale yellow, yellowish green
Colour: Deep reddish brown, brownish green, yellowish; greenish yellow
Solubility: Gelatinises with acids (Dana)
Weakly RADIOACTIVE
Environments:
Mosandrite is an alteration product of rinkite
(Dana).
At Mont Saint-Hilaire, Quebec, Canada, mosandrite occurs in
eudialyte-rich pegmatites,
sodalite xenoliths and
nepheline syenite
(Dana).
In Greenland mosandrite occurs in sodalite
syenite
(Dana).
The type locality is Låven, Larvik, Vestfold, Norway.
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