﻿410 



FERGUSON. 



6. Khyolite. McClelland Peak. Washoe Dist., Nev. Gooch. F. A.: U. 8. G. S. 

 (1885). Bull. 17. (Kemp. J. F. : Handb. of Rocks (1906), 28.) 



7. Xovaculite. Roekport, Ark. Beachett, R. N., for Griswold, L. S. : Geol. Ark. 

 ( 1890). 3, 161. (Kemp, J. F. : Handb. of Rocks (1906), 89.) 



8. Geyserite. Yellowstone Park. Weed, W. H. : U. 8. G. 8:, 9th An. Rep. 

 ( 1889), 670. 



9. Pulverent Siliceous (Sinter. Rotura, New Zealand. Weed, W. H. : U. 8. G. 8., 

 9th An. Rep. (1889), 670. 



Recast analysis of Cebu No. 57, considered as an igneous rock. 



Constituent. 



p Molec- 



eent ular .P r °- 

 t - eul - | portions. 



SiOo 76.51 



A1 2 3 14.93 



Fe.0 3 .27 



CaO 1.40 



MgO I 1.24 



KoO 4.98 



XaoO 



.67 



100.00 



1.275 

 .146 

 .002 

 . 025 

 .031 

 .053 

 .011 



Ortho- 

 clase. 



Albite. 



0.318 I 0.066 

 .053 ' .011 



An- 

 orth- 

 ite. 



0.050 

 .025 



.025 



.053 



.011 



Corun- 

 dum. 



Hema- MgO j 0nflrt . 



tite. SiOo. 



0. 031 



0.810 



0.57 



0.002 _ 



.031 



Constituent. 



Quartz 



Orthoclase 



Albite 



Anorthite _ 

 Corundum 

 MgO. Si0 2 - 



.810 

 .053 

 .011 

 . 025 

 .057 

 .031 

 Hematite I .002 



Per cent. 



48.60 Q48.60 

 29. 471 



5. 76 i F42.18 



6.95] 



5.81 C 5.81. 



3.10 .P 3.10 

 .32 



P 3.101 

 H .32/ 



Salic 96. 59 



Femic 3.42 



100. 01 100. 01 



100.01 



Class I. Persalane 



Subclass I. Persalone 



Order 3. (Quarfelic) Columbare 



Rang' 2. (Domalkalic) Alsbachose 



Subrang 2. (Dopotassic) Mihalose. 



