KNOOP HARDNESS NUMBERS FOR 127 OPAQUE MINERALS

Submitted by stuart on Wed, 02/21/2018 - 20:17

F. O. R. B. E. S. ROBERTSON, “KNOOP HARDNESS NUMBERS FOR 127 OPAQUE MINERALS”, Geological Society of America Bulletin, vol. 72, no. 4, p. 621, 1961.

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