Steenstrupine-(Ce)
Na₁₄Ce₆Mn²⁺Mn³⁺Fe₂²⁺(Zr,Th)(OH)₂(PO₄)₇(Si₆O₁₈)₂ · 3H₂O

     Steenstrupine-(Ce) occurs very rarely at MSH. It is found in both metamict and non-metamict forms and is X-ray amorphous.

PHYSICAL CHARACTERISTICS:

Color is usually dark red or red brown.
Luster is vitreous.
Diaphaneity is opaque.
Crystal System is hexagonal; R3m.
Crystal Habits include tabular crystals terminated by pinacoids to 3mm,
   glassy plates and blobs.
Cleavage {001} is poor.
Fracture is conchoidal.
Hardness is 4 - 5.
Specific Gravity is approximately 3.4 g/cm³.
Streak is black.
Associated Minerals include aegirine, eudialyte, lueshite, sodalite,
   villiaumite and vuonnemite.
Distinguishing Features: Crystal habit.
Origin: Named in 1881 after Knud Johannes Vogelius Steenstrup
   (1842-1913), Danish geologist who discovered the mineral.

CLASSIFICATION:

REFERENCES:
MinRec 21:340-341 (1990), Dana 8:1265 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

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