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Lepidocrocite crystals
© Doug Merson
FeO(OH)
Lepidocrocite is a rather unimportant and relatively rare mineral species from MSH.
PHYSICAL CHARACTERISTICS:
Color ranges from dark red to reddish-brown.
Luster is adamantine.
Diaphaneity is opaque.
Crystal System is orthorhombic; Cmc
Crystal Habits include granular to powdery fillings and masses.
Cleavage {010} is perfect, {100} is less perfect and {001} is fair.
Fracture is not apparent.
Hardness is 5.
Specific Gravity is approximately 4.1 g/cm
Streak is orange.
Associated Minerals include aegirine, anglesite, arsenopyrite,
beudantite, gonnardite, greigite, hemimorphite, microcline,
mimetite, muscovite, natrolite, pyrite, pyrrhotite and sphalerite.
Distinguishing Features: none.
Origin: Named in 1813 from the Greek lepidos, scale, plus
krokis, fiber or thread, alluding to its scale or feathery habit.
CLASSIFICATION:
Dana System
# 6.1.2.2
Strunz Classification
# IV/F.06-40
REFERENCES:
MinRec 21:318 (1990), Dana 8:270-271 (1997)
DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:
MSH
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