A series of facets in zone [010] was ground on a diamond. The grinding direction was maintained parallel to the zone axis, and the cutting rates were determined. It is shown that the grinding hardness of diamond even along a principal (four-fold) axis is dependent upon the orientation of the surface on which the measurement is made.

It is not possible to represent a grinding hardness solid, analogous, for example, with the optical indicatrix of transparent crystals. The implication is that if it were possible to develop a theory of grinding hardness in diamond, the simplest hardness model must be represented by a tensor of at least fourth order.

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