Ilimaussite-(Ce)

Formula:  Ba₂Na₄CeFeNb₂Si₈O₂₈ ^. 5H₂O

Origin of name:  Locality; Ilimaussaq, South Greenland

Crystal system:  Hexagonal

Crystal class:  6/m 2/m 2/m

Twinning: 

Unit cell: a = 10.8, c = 20.31

Colour:  Brownish-yellow, yellowish white

Diaphaneity: Transparent to subtranslucent

Luster:  Resinous, earthy

Habit:  Lamellar aggregates

Hardness:  ~ 4

Specific gravity:  3.6

Cleavage: 

Tenacity: 

Streak: White

Synonyms/varieties:

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