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Millerite crystals - click for larger pic
Millerite crystals
© Bill Lechner

Millerite crystals - click for larger pic
Millerite crystals
© Modris Baum

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Home > Mineral Descriptions > Millerite - (2 Photos)



Millerite
NiS

     Millerite is an extremely rare accessory mineral in igneous breccia cavities.

PHYSICAL CHARACTERISTICS:

Color is usually brass-yellow.
Luster is metallic.
Diaphaneity is opaque.
Crystal System is hexagonal; R3m.
Crystal Habits include long and thin flexible striated acicular crystals
   forming diverging sprays.
Cleavage {1011} and {0112} are perfect.
Fracture is uneven.
Hardness is 3 - 3.5
Specific Gravity is approximately 5.4 g/cm3.
Streak is green-black.
Associated Minerals include (??).
Distinguishing Features: Crystal habit.
Origin: Named in 1845 for William H. Miller (1801-1880), English
   mineralogist, who first studied the crystals.

CLASSIFICATION:

Dana System
# 2.8.16.1

Strunz Classification
# II/C.21-30

REFERENCES:
MinRec 21:322 (1990), Dana 8:81 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX
--

SS
--

MC
--

HF
--

BR
¤¤

SX
--

FR
--

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