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Phosinaite-(Ce)
Na13Ca2Ce(Si4O12)(PO4)4

     Phosinaite-(Ce), formerly UK # 64, is another rare species at MSH. Phosinaite-(Ce) crystals are usually covered by a brownish film masking the true colour of the crystals.

PHYSICAL CHARACTERISTICS:

Color is usually colorless to light brown.
Luster is vitreous.
Diaphaneity is transparent.
Crystal System is orthorhombic; P22121.
Crystal Habits include fibres and thin acicular needles.
Cleavage [100] is perfect, [010] and [110] are indistinct.
Fracture is (??).
Hardness is 3.5
Specific Gravity is approximately 2.97 g/cm3.
Streak is white.
Associated Minerals include eudialyte, fluorite, steenstrupine,
   thermonatrite, ussingite, villiaumite and vuonnemite.
Distinguishing Features: Crystal habit.
Origin: Named in 1974 to reflect its composition: phosphorus, silicon
   and sodium.

CLASSIFICATION:

Dana System
# 60.2.2.1

Strunz Classification
# VIII/E.07-185

REFERENCES:
AmMin 60:488 (1975)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX
--

SS
--

MC
--

HF
--

BR
--

SX
¤¤

FR
--

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