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  • 1970-1974  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 249 (1974), S. 754-755 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Biogenous opal is the principal source of silica for the formation of chert12. Silica may also be produced by the alteration of volcanic detritus, resulting in the mineral assemblage smectite, zeolite and opal3*4. A third possible source, not previously suggested in the literature, is the ...
    Type of Medium: Electronic Resource
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