NOTES ON SOME IGNEOUS ROCKS OF JAPAN 47 
A B c 
SHO Ss er aleiacat Cane cite narnUIUtes Sees kane 70.75 68.13 69.06 
INO ESS a tats Gallant ORS Nene 12.44 D575 14.41 
JE Osteen aero etc bes Sie Sees eee eeeermea 2.66 1.60 1.89 
TREO iain Ge or aes as NP hare eae a ©.70 0.74 0.54 
TN IG O) esa hea ar aS 0.08 0.45 0.39 
GAOT ee era Ss Sislies Sanieercin os aeote 0.39 On .27 trace 
IN a OMS ere aI nib cia eyelet acon 0.39 0.61 0.24 
TAO) See okcenet monn Oren Untied arene ts Tas i 10.54 T2133 
TE LAO) a rcreseetletnee Sateen Gna yee 0.84* 1.90 0.96 
MIS Oaperse iietea omuninnise ee einene 0.53 0,31 0.24 
ORE Ea ci Wane cco hWias rar Toe ial 0.10 trace 0.08 
IMD Ota trol ena Gees tig ma eeata ee 0.09 ae 
S Oe eran ear Rie LAGS ta ara all avy 0.07 0.28 
CO nk ee emit nies ten yeas ee 0.24 
MNO Fale, Vater acs ee 100.57 100.37 100.51 
* Loss on ignition. 
A. Potash-rhyolite from Manzoyama, Izu. K. Yokoyama, analyst. 
B. Quartz-porphyry from Himmelberg, Bl. Lebach, Prussia, described by Weiss and Gebe. 
K. Boettcher, analyst. 
C. Quartz-orthoclasite from Mutterbach. Masserthal, Thueringerwald, described by H. Loretz. 
Hampe, analyst. 
The chemical character of the rock from Manzoyama is notice- 
able on account of the extremely high percentage of potash, from 
which it is seen that the sanidine is entirely free from isomorphous 
mixtures of other feldspars. The quartz-porphyry from Himmel- 
berg and quartz-orthoclasite from Mutterbach, the chemical com- 
positions of which are given in columns B and C, are quite similar 
to the rock from Manzoyama. 
A B Cc 
OUUATEZ Riiitaste nucle ret raseayr rata, a Din? 2252 19.9 
@rthoclases Sake ye sve. 67.8 @2iK) 2.8 
AMDSTUEIS a 16 iced aiesel Glace ome DR aa Gere Rye Bea 
AMIOGLMILER Rene rene musi Taal ae 
@orundumey ene eer) 2.8 0.6 
ANEITANIRS 3°" 5 Eee He eeu charade oPaes etd | 2.8 
Wiopsiderrr sensed esekeeemas 5G Re os 
JShYVOSMU NING, Gabandennoss coe. a | Beat | 1.0 
ilmenitesyan cana tenuate I:1 0.6 | 0.5 
MWVielome tite eases yarn tect eis 0.6 Al | ig) 
BiTematitee dey acrwincn ess cece ina | 0.6 | aa 
PAA LICR iene ae slate iene ech sein Ou8 | 
BING Galli tee eee SUE He ietele Spc, 99 .6 98.6 99.2 
