General Information:
Chemical Formula:
Na26REE6(SiO3)6(PO4)6(CO3)6(S++++O2)O
Composition:
(Molecular Weight = 2,928.18 gm)
La,Ce,Pr,Nd,Sm,29.51 % RE
Sodium 20.41 % Na
Silicon 5.75 % Si
Phosphorus 6.35 % P
Carbon 2.46 % C
Sulfur 1.10 % S
Oxygen 34.42 % O
Empirical Formula:
Na26REE6(SiO3)6(PO4)6(CO3)6(SO2)O
Environment:
A single crystal embedded in sodalite in a xenolith of sodalite syenite.
IMA Status:
Approved IMA 1992
Locality:
TL: Poudrette Quarry, Mont Saint-Hilaire, Rouville County, Quebec, Canada.
Name Origin:
For the Abenaki Indian tribe, which inhabited the area around Mont Saint-Hilaire.
Physical Properties:
Cleavage:
[0001] Poor
Color:
pale brown.
Density:
3.21
Diaphaniety:
Transparent
Habits:
Euhedral Crystals - Occurs as well-formed crystals showing good external form., ,
Hardness:
4 - Fluorite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
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