Abstract
Variation of microhardness with orientation of indenter (A) and quenching temperature T q is studied on freshly cleaved surfaces {100} of natural rhombohedral crystals of calcite by producing Knoop indentations for various applied loads. The relation between hardness H A and quenching temperatures for the high loads (40-80 g) is graphically established. It also depends on the crystal orientation. The anisotropic indices are also determined
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