. Scientific survey of Porto Rico and the Virgin Islands. Scientific expeditions. of variahk wulfh. As pheuoerystf^ au«l as grouudimiss tlie fiddspars make ap CO per eeni of the nndx. Ahout 'M) per oiart of hytownite iiiHuiiiite ni-cairs, whieh is simihir to tbi' otlu;r felds|airs except in extinctirju. Xearly 10 per cent, of .i>5 mm. ecpiant grain of angitc are prcseni. CaK .ilc. <-hlorite ami hennilite oc^cur as sceondary minerals (Fig. 2'.)). Oliriiic Bmalh. ^The nlivine are found frc tahular dark greiui ang'itcs, o mm. talnilar. striated, light grei-n Cchl- -pars. and
. Scientific survey of Porto Rico and the Virgin Islands. Scientific expeditions. of variahk wulfh. As pheuoerystf^ au«l as grouudimiss tlie fiddspars make ap CO per eeni of the nndx. Ahout 'M) per oiart of hytownite iiiHuiiiite ni-cairs, whieh is simihir to tbi' otlu;r felds|airs except in extinctirju. Xearly 10 per cent, of .i>5 mm. ecpiant grain of angitc are prcseni. CaK .ilc. <-hlorite ami hennilite oc^cur as sceondary minerals (Fig. 2'.)). Oliriiic Bmalh. ^The nlivine are found frc tahular dark greiui ang'itcs, o mm. talnilar. striated, light grei-n Cchl- -pars. and pits of olivine shape. Most of these rocks arc either ?"'sieular or amygdaloidal (Fig. ?A)). A study of the thin sections ^..me of them to l„- basalt it- xitropliyrcs which have a deitledly bialal. 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
