Mineral 1.0Test your knowledge of specific minerals

M
E
N
U
« Home | Browse Minerals | QuizzesMinerals by letter: All | A | B | C | D | E | F | G | H | K | L | M | N | O | P | Q | S | T | W | Z
Minerals by class: Carbonates | Halides | Hydroxides | Native elements | Oxides | Phosphates | Silicates | Sulfates | Sulfides
Silicate Subclasses: Amphiboles | Cyclosilicates | Frameworks | Nesosilicates | Phyllosilicates | Pyroxenes | Sorosilicates
  

« Back to mineral listing

A
U
G
I
T
E

Click for expanded view




Augite(Ca,Na)(Mg,Fe,Al,Ti)(SiAl)2O6

Class: Silicate
Subclass: Pyroxene
Hardness: 5.5 - 6
Density: 3.2 - 3.5
Streak: White or gray
Lustre: Vitreous
Habit: Small blocky grains.
Colours: Dark-greeny black colour

  Crystal System: Monoclinic
Cleavage: Good / Uneven
Fracture: Uneven to conchoidal
Magnetism: None
Reaction with HCl: None

Identification in hand sample:
Colour, cleavage and hardness are indicative of a pyroxene. Augite has 2 cleavage planes at 90.

Associations:
Found in mafic to ultramafic rocks, and in high-grade metamorphs.

Industrial / ecomonic uses:
None.

Comments:
Often twinned.

  

Inaccurate data? Better photos? .