Building Materials
Ultimate strength to cement is provided by

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

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Building Materials
Asbestos

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

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