Greigite
FeFe2S4

     Greigite, a member of the linnaeite group, is extremely rare at MSH. Only a few grains have been recovered.

PHYSICAL CHARACTERISTICS:

Color is usually dull black.
Luster is metallic.
Diaphaneity is opaque.
Crystal System is isometric; Fd3m.
Crystal Habits include anhedral crystals to 2mm.
Cleavage none observed.
Fracture is not apparent.
Hardness is 4.
Specific Gravity is approximately 4.0 g/cm3.
Streak is black.
Associated Minerals include aegirine, analcime, ancylite, calcite,
   microcline and rhodochrosite.
Distinguishing Features: Not enough material.
Origin: Named in 1964 after Joseph Wilson Greig (1895-1977),
   American petrologist and geochemist.

CLASSIFICATION:

Dana System
# 2.10.1.10

Strunz Classification
# II/D.01-10

REFERENCES:
MinRec 21:313 (1990), Dana 8:101 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
¤¤

AP
--

MX
--

SS
--

MC
--

HF
--

BR
--

SX
--

FR
--

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