Building Materials
Ultimate strength to cement is provided by

Di-calcium silicate
Tetra calcium alumino ferrite
Tri-calcium silicate
Tri-calcium aluminate

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Building Materials
Asbestos

Is a natural fibrous mineral substance
Contains iron oxide and alumina
All of these
Is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3)

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