MICA GROUP
Form sheet like structure
Can be spilt into very thin sheets along one direction Aluminium and magnesium are rich Occupy 4% of earth crust
HORNBLENDE:
(COMPOUND-COMPLEX SILICATE)
CRYSTAL SYSTEM: Monoc;inic
HABIT:
crystalline
CLEAVAGE: good(prismatic) FRACTURE:
conchoidal
COLOUR: dark
green, dark brown black
LUSTRE:
vitreous
HARDNESS: 5 to 6
SPECIFIC
GRRAVITY: 3 to 3.5 (medium)
STREAK:
colourless or white
COMPOSITION: hydrous
silicates of Ca, Na,
Mg, Al TRANSPARENCY:
translucent/opaque
OCCURRENCE:
found
in igneous rocks
USES: road
material
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