The a B C of Mining a Handbook for Prospectors
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Should the deposits of bauxite give out, the manu- facturers of aluminum would probably fall back on cryolite. At Tvigtuk, on the west coast of Greenland, it exists, as a very heavy vein, in gneiss. It is semi- transparent, and snow-white. Impurities may stain it yellow or red or even black. Its specific gravity is 2. 95, and its hardness 2. 5 to 3. It is fusible in the flame of a candle, and yields hydrofluoric acid if treated with sulphuric acid. It is still used for making soda and aluminum ...salts, and an imitation porcelain. It is also in general use as a flux.
Amber. This is a fossil resin, or gum, and may often be found in lignite beds. Recent discoveries have been made on the coast of British Columbia that are ex- pected to supply the world. All pipe-smokers know it.
Antimony. The commercial ore of this metal is the sulphide known as stibnite, or gray antimony. Its composition when pure is 72 per cent, antimony and 28 per cent, sulphur. Hardness is 2; gravity, 4. 5; luster, metallic; opaque; gray; cleavage, perfect.
What to read after The a B C of Mining a Handbook for Prospectors?
You can find similar books in the "Read Also" column, or choose other free books by Charles a Bramble to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Should the deposits of bauxite give out, the manu- facturers of aluminum would probably fall back on cryolite. At Tvigtuk, on the west coast of Greenland, it exists, as a very heavy vein, in gneiss. It is semi- transparent, and snow-white. Impurities may stain it yellow or red or even black. Its specific gravity is 2. 95, and its hardness 2. 5 to 3. It is fusible in the flame of a candle, and yields hydrofluoric acid if treated with sulphuric acid. It is still used for making soda and aluminum ...salts, and an imitation porcelain. It is also in general use as a flux.
Amber. This is a fossil resin, or gum, and may often be found in lignite beds. Recent discoveries have been made on the coast of British Columbia that are ex- pected to supply the world. All pipe-smokers know it.
Antimony. The commercial ore of this metal is the sulphide known as stibnite, or gray antimony. Its composition when pure is 72 per cent, antimony and 28 per cent, sulphur. Hardness is 2; gravity, 4. 5; luster, metallic; opaque; gray; cleavage, perfect.
What to read after The a B C of Mining a Handbook for Prospectors?
You can find similar books in the "Read Also" column, or choose other free books by Charles a Bramble to read onlineMoreLess
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