Definitions that will help you understand AUGITE:
Luster: The way a mineral looks (but not color or shape)
Vitreous luster: glassy in appearance
Transparency: How well light passes through a mineral
Transparent: completely see-through
Translucent: partially see-through (light passes through)
Opaque: not see-through at all (no light passes through)
Cleave: to break
Cleavage: How a mineral breaks -- If the broken piece has a smooth plane or crystal shape, the mineral has cleavage. A mineral that never produces any crystallized fragments when broken off due to stress has no cleavage. Minerals with perfect cleavage break (cleave) without leaving any rough surfaces
Fracture: the "chipping" of a mineral. All minerals exhibit a fracture. If a mineral with cleavage is chipped a certain way, it will fracture rather than cleave.
Crystal System: A way of dividing crystals based on properties like symmetry, how light bends within the crystal, and number of axes
Monoclinic system: has one plane of symmetry and one axis

Augite: (Ca,Na)(Mg,Fe,Al)(Si,Al)2O6

Augite: General Info

Mineral Category: silicate (calcium, magnesium, iron, aluminum)

Mineral Group: Pyroxene (solid solution)

Hardness: 5 to 6.5 on Mineral Hardness Scale

Color: Dark green, brown, black (sometimes with greenish-white streak)

Crystal System: monoclinic, 2/m

Crystal Habits: short, prismatic, granular, columnar, lamellar, fibrous

Mineral Cleavage: Good (110)

Fracture: Uneven

Luster: Vitreous

Transparaency: Opaque (Translucent in thin splinters)

Uses: No significant uses

Works Cited

"Augite.jpg." Augite Image. Web. 8 Dec 2010. <>.

"augite.jpg." Web. 22 Nov 2010. <>.

Cooper, Frances. "Augite." Department of Earth Sciences at University College London. The University College London, 2010. Web. 2 Jan 2011.

Covey, Stephen. "The Mineral Augite." Amethyst Galleries Mineral Gallery. Amethyst Galleries, 2010. Web. 23 Nov 2010. <>.

Jones, C. E. "Pyroxene (Augite)." Department of Geology and Plantary Science at The University of Pittsburgh. The University of Pittsburgh, 2008. Web. 2 Jan 2011.

Sorrell, Charles. Rocks and Minerals. New York: St. Martin's Press, 1973. 63-66. Print.