Science, Том 23John Michels (Journalist) American Association for the Advancement of Science, 1894 Since Jan. 1901 the official proceedings and most of the papers of the American Association for the Advancement of Science have been included in Science. |
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Стр. 32
... pyrites and colored brown or yellow by the iron oxides resulting from the decomposition of the pyrites , are the rocks always spoken of in the camp as " porphyry . " It is not surprising that the veins occur- ring in these rocks are so ...
... pyrites and colored brown or yellow by the iron oxides resulting from the decomposition of the pyrites , are the rocks always spoken of in the camp as " porphyry . " It is not surprising that the veins occur- ring in these rocks are so ...
Стр. 33
... pyrites , associated with graphic tellurium ( sylvanite ) , forming a rich and valuable ore . Some of this sylvanite ore is very beautiful as well as valuable - the surfaces being stained a rich blue verging on purple , by fluoric acid ...
... pyrites , associated with graphic tellurium ( sylvanite ) , forming a rich and valuable ore . Some of this sylvanite ore is very beautiful as well as valuable - the surfaces being stained a rich blue verging on purple , by fluoric acid ...
Стр. 35
... pyrites , in the manner described , and colored as they are by iron oxides . Much of the gold in the veins may have been derived by a more direct process from the micas , and did not undergo the intermediate stage of deposition with pyrites ...
... pyrites , in the manner described , and colored as they are by iron oxides . Much of the gold in the veins may have been derived by a more direct process from the micas , and did not undergo the intermediate stage of deposition with pyrites ...
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Meeting of the Iowa Academy of Sciences | 10 |
ROUGHING IT WITH AN ECLIPSE PARTY | 42 |
ESTERBROOKS | 56 |
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