An introduction to mineralogy: founded on the chemical composition of mineral and metallic bodies

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James Wacey, 1838 - 78 páginas
 

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Página 60 - This is strikingly shown in an alloy called the " fusible metal," which is composed of 8 parts of bismuth, 5 of lead, and 3 of tin, and melts at 203° F.
Página 62 - Its characters resemble those of pure molybdic acid ; but, treated with soda, it sinks into the charcoal, leaving a residuum of protoxide of iron on the surface.
Página 72 - Jirst water. — The following are some of the most extraordinary diamonds known : - — one in the possession of the rajah of Mattan, in the island of Borneo, where it was found about a century ago : it is shaped like an egg, and is of the finest water : its weight is 367 carats, or 2 oz.
Página 64 - ... at Munroe, Connecticut, along with wolfram, in large imperfect crystals imbedded in quartz, and massive, in pieces of considerable dimensions. 3. Yellow oxide of tungsten is found in the state of an orangeyellow powder investing tungsten, from whose decomposition it appears to result. It is readily soluble in warm liquid ammonia, and is precipitated white by acids ; the precipitate, by standing, reacquiring the yellow color. It has only been met with at Munroe, Connecticut. The easiest method...
Página 76 - Minerals exhibiting impressions of the forms peculiar to the crystals of other substances are said to be pseudo-morphous.
Página 40 - In the north of England it occurs in beds of considerable thickness and great extent, resting on the Newcastle coal formation. In the Isle of Man, it occurs in a limestone which rests on greywacke.
Página 27 - SE metamorphic zone. The sericite is a compact mass of minute muscovite scales with usually a faint green colour, and bearing a strong resemblance to talc, from which, however, it can easily be distinguished by aid of the blowpipe. 7. METALLIFEROUS DEPOSITS OF THE a. Contemporaneous. Devonian. — (1.) The famous copper and lead deposit of the Rammelsberg, near Goslar, has now been proved to be a set of great lenticular beds of ore in the Upper Devonian Goslar shale group, which is here inverted,...
Página 46 - By fusion with nitre, it acquires a dull black colour, but recovers its original colour and lustre, by heating with charcoal. It consists of iridium, wirti a portion of osmium.
Página 8 - The constituent parts of the emerald are, silica 64.5, alumina 16, glucina 13, oxide of chrome 3.25, lime 1.6, and water 2 ; and its colour is believed to be owing to the presence of chrome.
Página 76 - Iridescent. This term relates only to the colour with which the surfaces of some minerals are naturally tarnished : as yellow copper ore, iron pyrites, galena, sulphmet of antimony, &c.

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