. Scientific survey of Porto Rico and the Virgin Islands. Scientific expeditions. , Gh'OLOiiY OF TJIK SAX JI'AX lilSTUli'T The aridcBitcs arc the most alnuularit us well as \\w iiiuHt widrr^prcnd of I he igTicons rocks. arc lii^ oi ]:>or| tt''o aiiil a>>iiiim' all the strur'tiiral roriris"'lliat, are rcprc^ iii the (lisli-e-i. The esseii^ tial consiilneiit.^ are phio'iocJase of uiediirm cniiipoFitiiHi (oliti-uehibi' ami ami liorahJcTide. Certain varieties of ilie andesite jii which. ilu' phejioer3'sts were chiefl)' fehlspar
. Scientific survey of Porto Rico and the Virgin Islands. Scientific expeditions. , Gh'OLOiiY OF TJIK SAX JI'AX lilSTUli'T The aridcBitcs arc the most alnuularit us well as \\w iiiuHt widrr^prcnd of I he igTicons rocks. arc lii^ oi ]:>or| tt''o aiiil a>>iiiim' all the strur'tiiral roriris"'lliat, are rcprc^ iii the (lisli-e-i. The esseii^ tial consiilneiit.^ are phio'iocJase of uiediirm cniiipoFitiiHi (oliti-uehibi' ami ami liorahJcTide. Certain varieties of ilie andesite jii which. ilu' phejioer3'sts were chiefl)' fehlspar showed a i^potte<l appearanee due to iIh' white fehlspar pheiiocrvsts in a <hirk ^lii'tHirulniaHS. Other varieties in whieli the pheiioerysts were composed ehitdly of the I'erromagues!an iniii- 'rals a darker and more hasic appearance. Diopsidc is much tlie • Host abiiudant oC the forronjagnesiari inineraJs; hornhlemk; oeenrs hifr«'^ i«entl\', am] biotite quite raTeJy. The t»resent mineral constitnents ol' aianj of the andenites are largely the result of seeoodary alteration, ''•''?'•me of them contain sneh large (juantities oi' seeoinlary carl)onates that ^eey effervesce slighlJv in oold dilute acid. Serieite," chlorite, 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
Size: 1530px × 1633px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectscienti, bookyear1919
