Abstract
The Kentron Microhardness Tester combines pin-point placement of the indenter to one micron, with reproducible hardness values (within variable limits) on minute opaque mineral grains as small as 10 microns in diameter. The hardness range, in Knoop values, is from 5 to 1,500 for the opaque minerals examined. The hardness values and limits of hardness for 48 opaque minerals are given. Anisotropic minerals show variations in hardness with respect to orientation. Variable loads on the indenter result in variations in hardness values which are not fully explained. The instrument should be especially useful in the field of polished surface studies of the opaque ore minerals.
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