||Indian Ancient Science & Horoscopes
> Gemstone Guide.
F. Beryl group.
They are generally silicates of beryllium and aluminium.Emerald and aquamarine
are precious beryls.Hardness is 7.5 to 8. Specific gravity is 2.7 Lusture
Gemstone Name : Alexandrite .
A variety of chrysoberyl. Lusture is vitreous to greasy.Crystals
are transparent.Colour is green by day and red in artificial light.
The colour is caused by chromium
Hardness : 8.5; Specific gravity
Found in : Rhodesia
Gemstone Name : Emerald.
Crystals are small with inclusions.
Colour :The colour is dark green to grass green.The colour
is due to the presence of Chromium.
Hardness : 6; Specific gravity
: 2.4 to 2.9
Found in : South africa, Brazil and Coloumbia.
Gemstone Name : Aquamarine.
It is usually step cut.
Colour :The colour is due to the presence of iron.
Hardness : 8; Specific gravity
Found in : Brazil, Madagascar,South Africa and