Platinum

Platinum is the most valued precious metal; its value exceeds even that of gold. it has beautiful
silver white color,and ,unlike silver,does not tarnish.it is unaffected by common household chemicals and will not get damaged or discolored by chlorine,bleach, or detergents. it is tougher than all precious jewelry metals, though due to its flexible tenacity it still must be alloyed with other metals to prevent it from bending.natural platinum usually contains small amounts of the rare element iridium.in jewelry, iridium is alloyed with the platinum to increase its toughness.platinum jewelry is usually 90 to 95 percent pure.


Chemical Formula: Pt

Color                    : Metallic,white 

Hardness              : 4-4.5

Crystal system      : Isometric

Refractive index   : 

SG                         : 14-19 

Transparency        : Opaque

Double Refraction:  none

Luster                   :  Metallic

Cleavage              :  none

Mineral Class       : Platinum 


Sources:
            South Africa,Canada,U.S.A, etc