Building Materials
Pick up the constituent of good brick earth whose excess causes the raw bricks shrink and warp during drying and burning, from the following:

Magnesia
Iron-oxide
Alumina
Lime

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Building Materials
Asbestos

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

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