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Schairerite
Na21(SO4)7F6Cl

     Schairerite is another rare species from MSH.

PHYSICAL CHARACTERISTICS:

Color is usually colorless.
Luster is vitreous.
Diaphaneity is transparent.
Crystal System is hexagonal, P31m.
Crystal Habits include poor blocky crystals with etched faces.
Cleavage is indistinct.
Fracture is conchoidal.
Hardness is 3.5
Specific Gravity is approximately 2.6 g/cm3.
Streak is white.
Associated Minerals include arfvedsonite, kogarkoite, leucophanite,
   pectolite, phlogopite, shortite and UK # 90A.
Distinguishing Features: Crystal habits.
Origin: Named in 1931 after John Frank Schairer (1904-1970),
   American physical chemist.

CLASSIFICATION:

Dana System
# 30.1.9.1

Strunz Classification
# VI/B.12-30

REFERENCES:
Dana 8:625 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX
--

SS
--

MC
--

HF
--

BR
--

SX
¤¤

FR
--

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