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Abenakiite-(Ce)

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Abenakiite-(Ce)
Abenakiite-(Ce) (or IMA 1991-054) is a mineral of sodiumceriumneodymiumlanthanumpraseodymiumthoriumsamariumoxygensulfurcarbonphosphorus, and silicon with a chemical formula Na26Ce6(SiO3)6(PO4)6(CO3)6(S4+O2)O. It is named after the Abenaki, an Algonquian Indian tribe of New England. Its Mohs scale rating is 4 to 5.

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Mineralogy Database Dictionary

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Abenakiite-(Ce)

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 % 
Carbon 2.46 % 
Sulfur 1.10 % 
Oxygen 34.42 % 
 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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