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Britholite-(Ce)
(Ce,REE,Ca,Na)5{(Si,P)O4}3(OH,F)

     Britholite-(Ce) is an uncommon member of the apatite group at Mont Saint-Hilaire. It is very similar to several other species such as pectolite, cancrinite and revdite, and visual identification is impossible.

PHYSICAL CHARACTERISTICS:

Color is usually colorless.
Luster is adamantine.
Diaphaneity is transparent to translucent, and opaque.
Crystal System is hexagonal; P63/m or P63.
Crystal Habits include radiating groups of prismatic crystals
   to 1.5mm long, tabular grains and anhedral grains.
Cleavage none observed.
Fracture is conchoidal to uneven.
Hardness is approximately 5.
Specific Gravity is > 3.9 g/cm3.
Streak is brown.
Associated Minerals include aegirine, analcime, astrophyllite,
   biotite, calcite, fluorite, monazite, pectolite, sodalite and zircon.
Distinguishing Features: Crystal habit and luster.
Origin: Named in 1901 from the Greek brithos, weight, alluding
   to its relatively high specific gravity.

CLASSIFICATION:

Dana System
# 52.4.9.1

Strunz Classification
# VIII/B.27-60

REFERENCES:
MinRec 21:299 (1990), Dana 8:1100-1101 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX
--

SS
--

MC
--

HF
--

BR
--

SX
¤¤

FR
--

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