1 Silver – Gems stone
Pink Color Tourmaline Specimen

Pink Color Tourmaline Specimen

Beautiful Natural Golden Colour Topaz Specimen From Pakistan More »

Blue sapphire gemstone Specimen

Blue sapphire gemstone Specimen

Blue sapphire gemstone Specimen,sapphire crystal Specimen,Tourmaline Specimen,Crystal Tourmaline, More »

Tourmaline Cuts Shapes

Tourmaline Cuts Shapes

Tourmaline Cuts Shapes,Blue sapphire gemstone Specimen,sapphire crystal Specimen,Tourmaline Specimen, More »

watermelon Tourmaline

watermelon Tourmaline

watermelon Tourmaline,Blue sapphire gemstone Specimen,sapphire crystal Specimen,Tourmaline Specimen, More »

Blue sapphire gemstone Specimen

Blue sapphire gemstone Specimen

watermelon Tourmaline,Blue sapphire gemstone Specimen,sapphire crystal Specimen,Tourmaline Specimen, More »

 

Category Archives: Silver

Silver

SILVER

COLOUR : Silver

COMPOSITION :Ag

CRYSTAL STRUCTURE :cubic

HARDNESS :2.5-3 specific gravity :10.1-11.1

LUSTER:Metallic

TRANSPARENCY :  Opaque

 

Silver usually occursin massive form as nuggests or grains, although it may also be found in wiry ,dendritic (tree-like) aggregates .when newly mined or recently polished ,it has a characteristic bright ,silver-white colour and metallic lustre .However,on exposure to oxygen in the air a black layer of silver oxide readily forms,tarnishing the surface .Because of this ,and the fact that it is too soft to be used in most jewellery in its pure form,silver is often alloyed with other metals ,or given a covering layer of gold and silver in use since the time of the Ancient Greeks contains 20-25 percent silver. Sterling silver  contains 921/2percent or more pure silver (and usually some copper) ,and Britannia silver has a silver content of 95 percent to more . Both alloys are used as standards to define silver content .

OCCURRENCE:Most silver is a by-product of lead mining ,and is often associated with copper .The main silver mining areas of the world are South America,the USA,Australia ,and the former USSR .The greatest single producer of silver is probably Mexico ,where silver has been mined from about AD1500 to the present day . The finest native silver ,which occurs naturally in the shape of twisted wire, is from Kongsberg ,Norway.