PYROXENES GROUP
It is important group of rock forming minerals.
They are commonly occur in dark colours, igneous and
metamorphic rocks They are rich in calcium, magnesium, iron, silicates
It show single chain structure of silicate
It is classified into orthopyroxene and clinopyroxene.
It is based on internal atomic structure
ORTHOPYROX ENE:
Enstatite
(MgSiO3)
Hyperthene
[(Mg,Fe)SiO3]
CLINOPYROXENE:
Augite [(Ca, Na)
(Mg, Fe, Al) (Al,
Si)2O6] Diopside
[CaMgSi2O6]
Hedenbergite[CaFeSi2O6]
AUGITE:
CRYSTAL
SYSTEM: Monoclinic
HABIT:
Crystalline
CLEAVAGE: Good (
primastic cleavage)
FRACTURE:
Conchoidal
COLOUR: shades
of greyish green and black
LUSTRE:
vitreous
HARDNESS:
5-6
SPECIFIC
GRAVITY: medium
STREAK: white
OCCURRENCE: ferro
magnesium mineral of igneous rock (dolerite)
USES: rock
forming mineral
COMPOSITON: [(Ca,
Na) (Mg, Fe, Al) (Al, Si)2O6]
TRANSPARENCY:
Translucent/opaque
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