Thirty-seven crystals of pyrite representing a wide range of habit, locality, and mode of occurrence, vary as follows: composition, FeS1.94 to FeS2.01 (10 analyses); specific gravity, 5.000 to 5.025 (10 crystals); optical anisotropism, none to strong; specific resistance at 20°C., in known and random directions, 0.014 to 256 ohms/cm. cube; temperature coefficient of resistance, -214 through zero to +26.5; thermo-electric potential against copper, strongly negative, through zero, to strongly positive, and often difierent in different parts of one crystal. Well developed lineage structure, with the “trunk” following a body-diagonal of the cube, is shown by one crystal.

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