Minerals And How to Study Them a book for Beginners in Mineralogy With More T
Minerals And How to Study Them a book for Beginners in Mineralogy With More T
Edward Salisbury Dana
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6 when pure, but higher when alloyed with gold, as often in nature. Native silver occurs rather abundantly in nature, as in Mexico, Arizona, Norway, also in South America and Australia. Silver is readily dissolved by nitric acid, forming silver nitrate, and from its solution the addition of any compound containing chlorine, as hy- drochloric acid or sodium chloride, causes part to separate as a white curdy deposit of silver chloride. This is a very delicate test for silver. Argentite, or Silver... Glance. Silver sulphide, Ag 2 S. Argentite is named from the Latin word of silver, argentum. It is a very valuable though not very common ore, since when pure it contains 87 per cent of metallic silver. It is found in cubic or octahedral crystals, often growing together in branching forms; more commonly it occurs simply in masses. The hardness is about 2, and the specific gravity 7. 3. It is readily cut with the knife, almost like lead, and hence is said to be eminently sectile, also flattening to some extent under the hammer, while almost all other sulphides are brittle and break at once with a blow into fragments.
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