i68 



WHITMAN CROSS 



unusually high in alumina for the augite of a rock with potash 

 strongly predominant over soda. 



TABLE OF CHEMICAL ANALYSES 



SiO^ 



Al,03 .... 



Fe^Oa.... 



FeO 



MgO .... 



CaO 



Na^O 



K,0 



H2O- 110 

 H2O+ 1x0 

 TiO^ .... 



ZrO, 



CO2 



CI 



P.Os 



V.O3 .... 



NiO 



MnO .... 



BaO 



SrO 



50-41 



o. 840 

 27 



O. 121 



71 



0.036 

 06 



0.045 



0.217 

 08 



o. 128 



97 

 0.016 



53 



0.080 

 46 

 80 



47 

 0.019 



0.46 



o .003 

 0.03 

 o 04 

 0.15 



0.002 

 0.23 



0.002 

 0.06 



100.42 



II 



51-27 



0-855 

 3-05 



0.029 

 3.08 



0.019 



4-34 



0.061 

 14.21 



0-355 

 22.58 



0.403 

 0.67 



O.OII 



0.06 



None 

 Undet. 

 o. 70 

 0.009 



0.03 

 0.28 

 0.004 

 None 



None 



100. 27 



III 



1.58 

 1 .00 



None 

 0.87 

 I. 22 

 0.68 



Undet. 



Undet. 



None 

 Undet. 



0.46 



Trace 



None 



5.81 



IV 



52.26 

 •63 



100. 14 



56 



99.60 



57- 

 14. 

 I . 

 4- 

 7- 

 6. 



100.61 



VII 



Trace 

 0.30 

 0.07 



100. 14 



I. Prowersose (syenitic lamprophyre), Two Buttes, Colo.; W. F. Hillebrand^ 

 analyst. 



II. Augite from I; W. F. Hillebrand, analyst. 



III. Portion of I soluble in dilute nitric acid (1:40). 



IV. Prowersose (syenite porphyry), Knox county, Maine. George Steiger, 

 analyst. 



V. Ciminose (selagite); Monte Catini, Tuscany; H. S. Washington, analyst; 

 American Journal 0} Science, Vol. IX (1900), p. 47. 



VI. Ciminose (ciminite), La Colonetta, near Viterbo, Italy; H. S. Washington, 

 analyst; ibid., p. 44. 



VII. Fergusose (fergusite), Highwood Mountains, Montana; E. B. Hurlburt, 

 analyst; Bulletin No. 237, U. S. Geological Survey, p. 86. 



