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متالوژی::
آلومینا
(b) Clays produced by lateritic action - very rich in alumina, some of which is apparently in a free state.
Normally aluminous, maximum alumina 40 per cent.
Highly aluminous, alumina exceeds 40 per cent.
(b) Diasporic clay Refractories High alumina 4, Stoneware, paving and Stoneware, paving bricks, Dense burning sewer pipe clays sewer pipes 5.
Alumina, which is also an integral constituent of the clay minerals, has some advantages.
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