534 



Henry C. Richards 



Formula. 



Mol. Weight. 



SiO . - 

 K O.AL.Og 

 Na^O.ALO 

 CaO. Al^b, 



MgO'. SiOa - 

 FeO.SiOo - 

 FeO . Fe.Og 

 FeO.TiOa " 

 FeS., - 

 3Ca,P..0„+CaF 



6SiO., 

 . 6SiO„ 

 2810" 



Class 



Order 



Sal 



Fern 



Q + L 



F 



K„0 + Na, 



Rang = 



Sub-rang = ^^^ ^ 



CaO 

 K.,0 



.3985 



.029 



.038 



.072 



.023 



.062 



.0475 



.005 



.016 



.0025 



.001 



_82.3 

 ^16^8 



24.0 

 "56X) 



67 

 ~ 72 



_ ?^ 

 " 38" 



X 60 

 x556 

 x524 

 x278 

 xl02 

 X 100 

 x 132 

 x232 

 X 152 

 X 120 

 x310 



<7/l 

 < 3 5 

 <5/3 

 <5/3 



Mineral. 



Quartz 



Orthoclase 



Albite 



Anorthite 



Corundum 



Norm. Group. 7. Group. % 



24.0 Q 24.0\ 



16.1) I 



19.9 VF 56.0 !- Sal 

 20.0 ) 



2.3 C 2.3 J 



82.3 



^ Hyi^erstheue 12.6 P 12.6 



Magnetite 1.2) jy, ^^ 



Ilmenite 2.4 j 



Pyrite 0.3^ 



Apatite 0.3 ) ^ ""^ 



- Fern 16.8 



>5'3= Class II. 



> 1/7 = Order IV. 



> 3/5 = Rang III. 



Dosalane 



Quardofelic Aiistrare 

 Alkali-calcic Tonalase 



• 3/5 = Sub-rang III. Sodi-potassic Harzose 



Calculation op Formula of the Minerals. 



Hypersthene. 



Ilmenite. 



6.4 



4.2 



4.44 



2.30 



22.33 



14.27 

 0.24 

 0.25 



0.76 

 0.06 



Mol. 

 Prop. 



920) 



/ 

 431 

 14/ 



Ratio. Per cent. 



310 

 356 



16 



12 



3/ 



67.28 



31.92 

 0.80 



Mol. 

 Prop. 



1 



841/ 



443^ 



20 



1.8 



Formula 2R.20.4RO. R.>0,- 6R0, 3R0.4RO, R0.2R0., 



Biotite - - 2 (KH).,0 . •t(F('Mg)0 . Al.O, • 6 (SiTi)O, 



Hypei'sthene 

 Ilmenite 



3(FeMg)0 . 48iO., 

 (FeMg)O . 2TiO., 



