1. SIR C R REDDY (A) COLLEGE
N.GANESH
5133
III-B.Sc
( )

2. Physical properties of minerals
A mineral should be definite solid substance having chemical composition
The physical structure of mineral is formed by the crystal

3. Physical properties are observed eye in proper light
A mineral should be studied by physical, chemical and optical properties
Physical properties are observed eye in proper light

4. Different physical properties
Depending on light
Colour
Form
Streak
Lustre
Cleavage
Fracture
Hardness
Specific gravity
Depending on light
Senses
Inner atomic structure
Specific gravity of minerals
Properties depending on heat
Magnetism
radioactivity

5. Colour Depends on obsorption and reflection
A mineral occurs in different colours
Ex : quartz
Ex : calcite

6. Form Crystal structure Depends on the group of crystal structure
Crystal character of the minerals is called crystal structure
Important forms are
Bladed form
Tabular form
Acicular form
Fibrous
Platy
Columnar
Reni
Granular
Prismatic grains
Crystal structure

7. Acicular form and prismatic grains

8. Streak It is the colour of the mineral powder
Streak tested on the streak plate
It is mode of unglazed porcelane
Streak and colour of minerals may be same or different

9. Lustre
It is amount of reflection of light on the mineral surface. They are different types
Intensity of lustre is called splended
Metallic
Adamantine
Vitreous
Resinous
Greasy
Waxy
Pearly
Silky etc

10. Cleavage

11. Fracture It is broken surface of the mineral Different types
Conchoidal
Even
Uneven
Hackly
fracture

12. Concoidal fracture It is the curved concave surface
It shows concentric lines
If it is less clear than the subconcoidal
Ex : Quartz
concoidal fracture

13. Even fracture Even fracture : The mineral surface will be even
Ex : chert
Even fracture :

14. Uneven
Surface will be ruff and irregular Ex : Limestone Uneven Fracture

15. Hackly fracture
The surface will have projection of crystals Ex : Asbectas , Zeolites Hackly Fracture==

16. Hardness
It is resistance offered by mineral to the pressure applied

17. Specific gravity
It is the amount of substance , the ratio of the weight equal to the volume of water
Amount of water displaced by a substance is it’s specific gravity
Picnometer is used to measure the specific gravity
Chemical balance , spring , walkers , steel yard method etc.

18. Thank you