- A
**matrix**of wood or iron is covered with successive layers of papers, pasted together so as to form pasteboard. - The Montana sapphires and the
**matrix**have been described by Dr G. - If the
**matrix**, however, is originally crystalline it does not seem probable that perlitic structure can develop in it. - The
**matrix**most commonly used is Portland cement, by far the best and strongest of them all. - Whatever
**matrix**is used, it is almost invariably "diluted" with sand, the grains of which become coated with the finer particles of the**matrix**.

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