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Cordierite
(Mg,Fe2+)2Al3(AlSi5O18) ยท H2O

     Cordierite is rare at MSH.

PHYSICAL CHARACTERISTICS:

Color is usually white or pale gray.
Luster is vitreous to greasy.
Diaphaneity is transparent to translucent.
Crystal System is orthorhombic; Cccm.
Crystal Habits include small embedded grains.
Cleavage {100} is moderate, while {001} and {010} are poor.
Fracture is conchoidal to uneven.
Hardness is 7.
Specific Gravity is approximately 2.6 g/cm3.
Streak is white.
Associated Minerals include (??).
Distinguishing Features: Crystal habits.
Origin: Named in 1813 after Pierre Louis Antoine Cordier (1777-1862),
   French geologist who described the mineral.

CLASSIFICATION:

Dana System
# 61.2.1.1

Strunz Classification
# VIII/E.12-40

REFERENCES:
Dana 8:1251-1253 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX
--

SS
--

MC
--

HF
--

BR
--

SX
--

FR
--

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