440 Pirsson and Washington — Geology of New Hampshire. 



gray to black specks ; apparently equigranular in texture 

 but subporphyritic, with occasional phenocrysts of feldspar 

 2-3 mm ; of a sugar granular habit ; fracture easy and brittle ; 

 superficially slightly weathered. 



Microscopic. — Alkalic feldspar and quartz essential ; biotite, 

 iron ore, allanite and zircon accessory. 



Alkalic feldspars consist of orthoclase and albite in 

 roughly equidimensional anhedral grains. Some albite-oligo- 

 clase noted, subtabular to subprismatic in form ; albite and 

 Carlsbad twinning. Fhenocrystic feldspars roughly equidimen- 

 sional or cuboidal, of orthoclase with much perthitic inter- 

 growth of soda-microcline and albite. Quartz, equidimensional, 

 anhedral, sometimes micrographic with feldspar. Quartz and 

 feldspar of groundmass average 0'5 mrn . Biotite dark brown, 

 pleochroic, tabular, platy and in shreds, subhedral ; about 0'2 mm , 

 thinly scattered. Hornblende very rare, pleochroic, dark green 



I II 111 IV V VI VII 



Si0 2 _75-65 76-49 76-05 76'64 76*03 74*12 1-261 



A1 9 G 3 12-89 11-89 11-68 13-50 11-76 1239 '126 



Fe 2 3 0-89 T16 0'34 0'50 1*99 0'31 '006 



FeO 1-11 1-56 1-05 n.d. n.d. 0-21 -015 



MgO 0-20 tr. 0-29 12 0'27 0'42 '005 



CaO 0-48 0-14 0-42 ("65 0'45 0'30 '009 



Na 9 3-71 4-03 3-79 3'48 3-36 3'22 '060 



K 2 5-50 5-00 5-09 5*51 5'61 507 *059 



H o 110°+ 0-15 0-12 1-36 n. d. 0-63 217 



H;0 110°— 0-08 0-38 .... .__ 2-22 



Ti0 2 0-05 tr. 0-05 .... 



P o 5 n.d. __.. 



MnO " tr. tr. 



ZrO. " .... -42 ... .... 



100-71 100-77 100-54 100-40 100*10 100'33 



I. Biotitic-grano-liparose (aplite) ; dike on upper southwest 

 slope of Mt. Belknap. H. S. Washington analyst. 



II. Riebeckite-phjn-o-liparose (paisanite) ; Magnolia, Mass. 

 Washington, Jour. Geol., vii, 1899, p. 113. 



III. Liparose (quartz porphyry) ; Drarnmen, Norway ; Lang, 

 Nyt. Mag. xxx, p. 40, 1886 ; P. Jannasch analyst. 



IV. Liparose (granitite) ; Arild, Kullen, Sweden ; A. Hennig, 

 Act. Univ. Lund, xxxiv, 1898. Hennig analyst. 



V. Liparose (quartz porphyry) ; Thai, Thiiringerwald, Baden ; 

 K. Futterer, Mitth. Bad. Geol. Ld. Anst. II. p. 58, 1893. 



VI. Liparose (trachyte) ; Wantialable Creek, Gowen Co., New 

 South Wales; G. W. Card, Rec. Geol. Surv. N. S. W., iv, p. 116, 

 1895. Mingaye analyst. 



VII. Molecular proportions of No. 1. 



