Opal-gemstone

Opal is the most colorful of gems. its splendid play of color is unsurpassed, and fine examples can even be more valuable than Diamond. the play of color consists of iridescent color flashes that change with the angle at which the stone is viewed. this phenomenon is often called
opalescence.the play of color may consist of large , individual flashes of color or may be of tiny, dense flashes.the intensity and distribution of color flashes is a determining is a factor in the value of an opal.the person who born is October use opal as gemstone. its have great natural super powers to change your life.and protect your from sins.





Chemical Formula: Sio/2 . nH/2O

Color                    : ,Blue,Green,Red, Green, yellow, orange, brown, pink, purple, gray, black.

Hardness              : 5.5 - 6.5

Crystal system      : Amorphous

Refractive index   : 1.37-1.47

SG                        :  1.98-2.25

Transparency        : Transparent to translucent

Double Refraction: .none

Luster                   :  Vitreous,pearly,waxy

Cleavage              :  none

Mineral Class       : opal

Sources:
             Australia is the largest producer of opal.other important deposits are in Ethiopia,Sudan,hungry,Honduras,etc