The ultra‐micro‐hardness of non metallic crystals has been measured for 16 substances. These are products usually produced in mass‐crystallization; inorganic, organic, with hydrates and unhydrates. The hardness‐force‐dependency was examined and data are compared to literature. KNO3 crystals showed a strong direction dependency (a factor of 2). In the end there has been made a first attempt to introduce a correlation of the measured micro‐hardness and physical properties of the crystals, but so far this was only possible for face centred cubic lattices.
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Ulrich et al. (1989) studied this question.
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