The Earth And Its Story a First book of Geology
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In our eReader you can find the full English version of the book. Read The Earth And Its Story a First book of Geology Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Earth And Its Story a First book of Geology
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SOME OF THE COMMON AND MORE USEFUL METALS AND MINERALS.
Gold is a widely distributed mineral, and is usually found in association with quartz veins of mountainous and volcanic regions, or among the washings (sand, gravel, ' river-mud) that have been derived from the destruction of the parent rock. Its more general form is that known as "native gold, " wliich is an alloy of about ninety per cent pure gold and eight or ten per cent silver; all native gold has silver with it, and in the substance ...known as electrum the quantity of the latter amounts to about twenty per cent. Common or native gold is a soft, highly ductile and malleable metal, heavy in weight (about nineteen times the weight of water), and free from tarnish; in the solid rock it occurs as strings, flakes, and crystalloids, fre- quently in association with iron pyrites, and occupying cavities in the " rotten " rock which have been left by their decomposition. In the river-washes, " placer " deposits, it is also found in flakes, grains, and scales, and at times as " nuggets " of considerable size and weight.
What to read after The Earth And Its Story a First book of Geology?
You can find similar books in the "Read Also" column, or choose other free books by Angelo Heilprin to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
SOME OF THE COMMON AND MORE USEFUL METALS AND MINERALS.
Gold is a widely distributed mineral, and is usually found in association with quartz veins of mountainous and volcanic regions, or among the washings (sand, gravel, ' river-mud) that have been derived from the destruction of the parent rock. Its more general form is that known as "native gold, " wliich is an alloy of about ninety per cent pure gold and eight or ten per cent silver; all native gold has silver with it, and in the substance ...known as electrum the quantity of the latter amounts to about twenty per cent. Common or native gold is a soft, highly ductile and malleable metal, heavy in weight (about nineteen times the weight of water), and free from tarnish; in the solid rock it occurs as strings, flakes, and crystalloids, fre- quently in association with iron pyrites, and occupying cavities in the " rotten " rock which have been left by their decomposition. In the river-washes, " placer " deposits, it is also found in flakes, grains, and scales, and at times as " nuggets " of considerable size and weight.
What to read after The Earth And Its Story a First book of Geology?
You can find similar books in the "Read Also" column, or choose other free books by Angelo Heilprin to read onlineMoreLess
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