Building Materials
Rapid hardening cement contains

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

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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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