Abstract
PROF. A. S. EAKLE, of the University of California, published tables in 1904 by which the common minerals could be ‘run down’ by using in a systematic manner the properties of streak and colour, and by the observation of other characters such as hardness, crystal symmetry, cleavage and fracture, the habit or structure of the mineral, the specific gravity, and the chemical composition. Dr. A. Pabst has revised Eaklo's tables, making such additions and changes as were necessary to bring them up to date. About 200 minerals are included. For the application of the tables the only apparatus required is a streak-testing plate of unglazed porcelain, a pocket knife and set of minerals for the scale of hardness, a magnet and a pocket lens. Admittedly tests with this simple equipment do not suffice to identify definitely every mineral, and recourse must frequently be had to determination of specific gravities and to optical and chemical tests, but the application of the physical tests in a systematic way is good training for the student who will need to identify minerals in the field.
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