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Ch. 1: Form of Minerals

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	FORM OF MINERALS 63

	duce intersecting macles like the pentagonal dodecahedrons of iron pyrites in fig. 70, and the tetrahedrons of gray-cop-



	per or fahlore in fig. VI, a similar formation also occurring ' in the diamond. In macles with inclined axes the two forms almost always unite by a face of the octahedron, and the two individuals are then generally apposed and shortened in the direction of the twin axis by one half, so that they appear like a crystal that has been divided by a plane parallel to one of its faces, and the two halves turned round on each other by an angle of 180°. In this manner two octahedrons of the spinel, magnetic iron ore, or automolite



	(fig. 72), are frequently united. The same law prevails in the intersecting cubes of fluor spar, iron pyrites, and galena,

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Feuchtwanger. Treatise on Precious Stones.

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1 Page 399 second in August and September; and the more rain, the more
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2 Page 401 weight of twenty-four grains is counted as thirty; so that a
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3 Page 398 body on, or by boring a hole in, the shell. The Chinese are
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4 Page 400 At the Pearl Islands, near the Isthmus of Panama, the pearl
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5 Page 406 In 1620, King Philip IV., of Spain, purchased a pear-shaped
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6 Page 401 weight of twenty-four grains is counted as thirty; so that a
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7 Page 402 reach the age of seven or eight years, and in the fourth yea
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8 Page 403 found in the Elster river, in the kingdom of Saxony, from it
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9 Page 404 nearly two millions of francs ; Julius Csesar presented to S
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10 Page 404 nearly two millions of francs ; Julius Csesar presented to S
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11 Page 405 The seed pearls, when quite round, are worth about one hundr
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12 Page 411 and on the Continent ; around Southampton, in England, these
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13 Page 412 Artificial Pearls. Artificial pearls or beads are of variou
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14 Page 406 n 1620, King Philip IV., of Spain, purchased a pear-shaped p
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15 Page 409 near the town of Paterson, New Jersey, went to a neighbori
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16 Page 410 of Messrs. Tiffany & Co., was purchased from Mr. Howell for
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17 Page 415 The shad-fish, as well as the white-fish of our lakes, must
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18 Page 413 decomposition, and for their preservation numerous chemica
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19 Page 414 Heidelberg, Nuremberg, Sonnenberg, Meistersdorf, in Bohemi
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