FeAsS

Arsenopyrite is a relatively rare mineral at MSH

PHYSICAL CHARACTERISTICS:

Color is usually silver-white.
Luster is metallic.
Diaphaneity is opaque.
Crystal System is monoclinic; P2₁/c.
Crystal Habits include the very sharp wedge-shaped crystals to
3mm and short prismatic crystals; crystalline masses.
Cleavage {001} is distinct.
Fracture is uneven.
Hardness is 5.5 – 6.
Specific Gravity is approximately 6.2 g/cm³.
Streak is black.
Associated Minerals include albite, amphibole group, apophyllite series,
berthierine, biotite, calcite, epidote, fluorapatite, fluorite, gaidonnayite,
galena, garnet group, molybdenite, pectolite, pyrite, pyrrhotite, rutile,
siderite, sphalerite, titanite, vesuvianite and zircon.
Distinguishing Features: Crystal habit, color and luster.
Origin: Named in 1847 for its composition, a contraction of the
older term arsenical pyrites.

CLASSIFICATION:

REFERENCES:
MinRec 21:296 (1990), Dana 8:129 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH          PE          AP          MX          SS           MC          HF           BR          SX          FR
¤¤¤            —           ¤¤            ¤¤             —            ¤¤             —            ¤¤          ¤¤             —  

Legend