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 %
RESodium 20.41 %
NaSilicon 5.75 %
SiPhosphorus 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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