Cooke, Josiah Parsons, 1827-1894 · Boston, Little, Brown and Company · leaf 181
ms,and they are therefore called trigonal trapezohedrons. Theyare evidently tetartohedral forms of the dihexagonal pyramid. These tetartohedral forms are never found isolated in nature ;but they appear very frequently on crystals of quartz in combina-tion with other forms. The crystals of this…
Matter · Heat
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