Cooke, Josiah Parsons, 1827-1894 · Boston, Little, Brown and Company · leaf 174
THE THREE STATES OF MATTER. 149 … ma: a ,p a.nh. are the dihexagonal pyramids (Fig. 111). Fig.ni. This form is bounded by twenty-four sca-leiie triangles, and the symbol of the prin-cipal form of the class is ma: a:pa: b, inwhich m and p are so related that p = ^^.When m = 1 then p = x, and this formpasses into the hexagonal…
Matter · Heat
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