Building Materials
The rocks having alumina or clay as their major constituents are known as

Sedimentary rocks
Argillaceous rocks
Calcareous rocks
Siliceous rocks

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Building Materials
Sapwood consists of

Portion of timber between heartwood and cambium layer
Thin fibre which extends from the pith outwards and holds the annular rings together
Innermost annular rings around the pith
Thin layers below the bark

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