Mimetite

Pb(AsOCl

Mimetite, a member of the apatite group, is an extremely rare secondary mineral at MSH.

PHYSICAL CHARACTERISTICS:

Color is usually white or beige.
Luster is adamantine.
Diaphaneity is transparent to translucent.
Crystal System is hexagonal;
Crystal Habits include minute needles.
Cleavage {001} is distinct and {100} is indistinct.
Fracture is conchoidal to uneven.
Hardness is 3.5 – 4.
Specific Gravity is approximately 7.3 g/cm
Streak is white.
Associated Minerals include aegirine, anglesite, arsenopyrite,
beudantite, gonnardite, hemimorphite, hydrocerussite, microcline,
muscovite, natrolite, pyrite, pyrrhotite and sphalerite.
Distinguishing Features: Crystal habit and luster.
Origin: Named in 1835 from the Greek mimetes, an imitator,
alluding to its ressemblance to pyromorphite.

CLASSIFICATION:

Dana System
# 41.8.4.2

Strunz Classification
# VII/B.39-160

REFERENCES:
MinRec 21:323 (1990), Dana 8:866-877 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
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