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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.


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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