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Here the arrangement of the trap and sandstones can be again profitably studied, and the mineralogical localities which I have described in a former one of these articles examined, not omitting the one at West Paterson, wherein so much phrenite may be found.
Apopholite is distinguished from calcite, as noticed under that species, and from the others by its form, difficult fusibility, and part solubility. Phrenite is characterized by its hardness, greenish color, occurrence, and action of acid. Iron pyrites is always known by its brassy metallic aspect and great hardness.
Upon heating with nitric acid it partly dissolves, and the remainder becomes flaky and gelatinous. Apopholite, although quite rare, now may be bought from the men, or at least one of the engineers of Shaft No. 2's elevator, and generally at low terms. Phrenite. This mineral is quite abundant in Shafts No. 1 and 2, in very small masses, incrustations, and even in small crystals.
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