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Siderophyllite

     Siderophyllite, a member of the mica group, occurs rarely at MSH.

PHYSICAL CHARACTERISTICS:

Color is usually dark green to black.
Luster is vitreous.
Diaphaneity is transparent to opaque.
Crystal System is monoclinic, C2/m.
Crystal Habits include foliated masses and pseudo-hexagonal prisms.
Cleavage {001} is perfect.
Fracture is not apparent due to cleavage.
Hardness is 2.5
Specific Gravity is approximately 3.0 g/cm3.
Streak is greenish-gray.
Associated Minerals include annite and biotite group.
Distinguishing Features: Crystal habits.
Origin: Named in 1880 from the Greek sideros, iron, plus phyllon, leaf,
   alluding to its composition and perfect basal cleavage.

CLASSIFICATION:

Dana System
# 71.2.2b.5

Strunz Classification
# VIII/H.11-90

REFERENCES:
MinRec 21:338 (1990), Dana 8:1461-1462 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX
--

SS
¤¤

MC
--

HF
--

BR
--

SX
--

FR
--

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