Anglesite
PbSO₄

     Anglesite occurs as an extremely rare secondary mineral at Mont Saint-Hilaire.

PHYSICAL CHARACTERISTICS:

Color is usually green or tan.
Luster is adamantine to earthy.
Diaphaneity is translucent to opaque.
Crystal System is orthorhombic; Pnma.
Crystal Habits include thin crusts on galena and tiny sharp
    pseudo-rhombohedra.
Cleavage: {001} is good.
Fracture is uneven.
Hardness is 2.5 - 3.
Specific Gravity is approximately 6.3 g/cm³.
Streak is white.
Associated Minerals include aegirine, arsenopyrite, beudantite,
    galena, microcline, pyrite, pyrrhotite and sphalerite.
Distinguishing Features: Crystal habit and forms.
Origin: Named in 1832 after its discovery locality, on the Isle of
    Anglesey, Wales.

CLASSIFICATION:

REFERENCES:
MinRec 21:296 (1990), Dana 8:575-576 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

Legend