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Silicates as the base of the Earth crust Silica and compounds derived from it, silicates, constituteca. 90% of the Earth crust substances. Silica gives rise to a beautiful meterial-glass. Nobody knows exactly how glass was discovered. There is a well-favoured story related to phoenician sailors who fused occassionally sea sand and soda ash. It is likely that they discovered the secret of "liquid glass" (LGL) sodium metasilicate (Na_(2)SiO_(3)) soluble in water. Determine the charge (n). |
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