Mosandrite-(Ce)

mosandrite

eudialyte

rinkite

sodalite

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Formula: (Ca3REE)[(H2O)2Ca0.50.5]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:

Pegmatites

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. Mosandrite-(Ce) specimens often shows signs of hydrothermal alteration. Here the alteration products may be a mixture of fluorite, pyrochlore, calcite, magnetite, pyrophanite and lorenzenite (Mindat).

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