521 resultados para Butte Symphony
Resumo:
The manganese minerals occur in the peripheral zone of the Butte district with quartz in veins, which at depth contain galena and sphalerite closely associated with silver-bearing minerals. The manganese oxides are all oxidation products formed by weathering of primary rhodochrosite or rhodonite.
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During the last few years a great deal of research has been done in connection with the black manganese oxide minerals. This is especially true of the so called mineral psilomelane. It has been proven without a doubt that the name psilomelane has been used in the past to include a great variety of similar black manganese oxide minerals. By the use of X-ray equipment these minerals have been definitely identified.
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Three cycles of erosion have modified the Boulder batholith. The earliest cycle produced a peneplaination that has been largely obliterated by a partially completed intermediate cycle, and the recent cycle now in progress.
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Signatur des Originals: S 36/F11969
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F available only in microfiche
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Mode of access: Internet.
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Duration: ca. 51 min.
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First ed. Cf. Šourek.
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Duration: 51 min.
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Mode of access: Internet.
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Mode of access: Internet.
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Includes 4 p. analysis in English and Spanish.
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"Edition Eulenburg no. 525".