(Ca,Mg,Fe²⁺,Fe³⁺,Al,Ti)₂(Al,Si)₂O₆

Augite is extremely rare at MSH. A single crystal had been found and is now lost. Any information on this species from MSH would be appreciated.

PHYSICAL CHARACTERISTICS:

Color is brown green, green, light brown, dark brown, black.
Luster is vitreous to resinous.
Diaphaneity is translucent to opaque.
Crystal System is monoclinic; C2/c.
Crystal Habits include granular crystals in matrix.
Cleavage: [110] is perfect, [010] is indistinct.
Fracture is conchoidal.
Hardness is 6 – 6.5
Specific Gravity is approximately 3.4 g/cm³.
Streak is greenish gray .
Associated Minerals include (??).
Distinguishing Features: Brittle.
Origin: Named in 1792 from the Greek auge, bright, referring to its
appearance of its cleavage planes.

CLASSIFICATION:

REFERENCES:
Dana 8:1299-1301 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

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

Legend