. Scientific survey of Porto Rico and the Virgin Islands. Scientific expeditions. Aetinolite ncxnirs as isohited needles, as needles pejjetratlng .pumz, ami iis rsidiating oT(»wths the occurreiH;*; of net i noli in .mudi rchiri,onslii|)S is peiierally regartied as sure proof of igneous ennmaJJons, The aetirioHte i> iHii, stalde, lint readily liydrat(w and ciniverts to (Jdorite. It is rnetase^^ iiuitie only in so far as it pencti-aP-s puailz ^ a ph.'iHunenon, very eonmion 01 roeks altereil by ignj'ous ematuilions, Aji interesting feature, rattier eonunr>n. is th,e assor-iation &
. Scientific survey of Porto Rico and the Virgin Islands. Scientific expeditions. Aetinolite ncxnirs as isohited needles, as needles pejjetratlng .pumz, ami iis rsidiating oT(»wths the occurreiH;*; of net i noli in .mudi rchiri,onslii|)S is peiierally regartied as sure proof of igneous ennmaJJons, The aetirioHte i> iHii, stalde, lint readily liydrat(w and ciniverts to (Jdorite. It is rnetase^^ iiuitie only in so far as it pencti-aP-s puailz ^ a ph.'iHunenon, very eonmion 01 roeks altereil by ignj'ous ematuilions, Aji interesting feature, rattier eonunr>n. is th,e assor-iation >.>!' ^ '^vilii ibf; aetiiKdite frerpjent!}' in intimate intergrowi:h. IT the aetinolite ?- an igneons emiination. Uien the zeolites nHi<r also have been iidi'odueed I'V tlieruial waters at Idgli temperaturt;. Anutlier feature is tlie extreme ' ?•vi'lopiueut of secondary quartz. Shales are converietl enlirelv to ehecfs ' '?? fill- (fuartz. 'Ilir- association of the quartz with, tlic oilier niinerids of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New York Academy of Sciences. New York, : The Academy
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectscienti, bookyear1919
