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.
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:  is perfect,  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.
Dana 8:1299-1301 (1997)
DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:
MSH PE AP MX SS MC HF BR SX FR
¤¤¤ — — — — — — — — —