Building Materials
Gypsum is a

Igneous rock
Metamorphic rock
Mechanically formed sedimentary rock
Chemically precipitated sedimentary rock

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Building Materials
Asbestos

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

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