Illustrated Catalogue of Gems, Cameos & Amber Collected by A. Booth, Gloucester

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John Bellows, 1880 - Amber - 11 pages
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Page 8 - ... destroy by setting its carbon at liberty. The opal has no colour that may be called its own, but a faint bluish tinge analogous to the tint of certain resinous quartz, of which it is a variety. Its true beauty and its great value are produced by a physical accident ; it is traversed by a multitude of fissures filled with air and moisture, which reflect all the prismatic colours. The tender violet of the amethyst, the blue of the sapphire, the green of the emerald, the golden yellow of the topaz,...
Page 6 - Chemical analysis shows that there are in 100 grammes of amber 81 grammes of carbon, 7*30 of hydrogen, 675 of oxygen, and some traces of clay, alumina, and silica, amounting altogether to about 3 grammes. This is exactly the composition of resin; indeed amber is itself a resin. " Amber," said Pliny, " trickles from the pith of certain trees resembling pines.
Page 6 - AMBER. Amber has been known from earliest antiquity. The celebrated founder of the Ionian school of philosophy, Thales, who lived 600 years before our era, speaks of the property which, above all, contributed to render it celebrated — that of attracting light bodies when it was rubbed. It is from the Greek- name of amber, electron, that our modern term electricity is derived. To explain the origin of amber, the Greeks had one of those graceful traditions-characteristic of the young and marvellous...
Page 10 - Glass is a mixture of silicate of potash or soda, or of both, with one or more silicates insoluble in water, as silicate of baryta, strontia, lime, magnesia, alumina, protoxide of manganese, protoxide of iron, sesquioxide of iron, and oxide of lead. Pure silicate of potash or soda, or a mixture of the two, even with a sufficient quantity of silica to form a very infusible glass, would still be attacked by water...
Page 9 - ... the creators of the science of chemistry — Humphry Davy in England, and Lavoisier in France. "And what is the diamond?" asks Babinet, who has such a quick eye to the poetry of science. "The most precious thing in the whole world. And what is carbon? The most common material that is known ; one that not only exists in vast quantities in the bowels of the earth, but that plants and trees of every kind contain, in an inconceivable quantity. Silver can hardly pay for the diamond; for if we imagine...
Page 6 - This quotation proves that the Roman naturalist considered amber as a contemporary production. He was right so far — amber is a resin; but it is a fossil resin, The places most rich in amber are the borders of the .Baltic Sea, between Dantzic and Memel -;- it is found also in Denmark, in Norway and Sweden, in Poland, France, and England, and in different parts of Asia and America.
Page 5 - Clear crystals are used in jewelry, as watch jewels, and as an imitation of the diamond. It may be distinguished from the latter by its inferior hardness, and in not becoming electrified by friction so readily.
Page 6 - halcedony is quite a common stone of a dull or milky white : and sometimes of a bluish tint, when it is called hirine.
Page 7 - Chen analysis ; but it is known to contain silica and alumina, with a supplement of soda, lime and sulphur. Its...

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