Silicate gemstones_garnet, tourmaline, quartz, jadeite, zircon, topaz

Silicate minerals are generally classified into seven major groups according to the structure of their silicates anion.
Nesosilicates, solosilicates, cyclosilicates, insilicates-single and double chain, phyllosilicates and tectosilicates.
According to F.W.Clarke known as the "father of geochmistry", average composition of the earth's crust consists of Lithosphere 93%, Hydrospere 7% and Atmosphere 0.03%.
As average composition 10mile crust, elements ar as follows: oxygen 49.52%, silicon 25.75%, aluminum 7.51%, iron 4.7% and etc.

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