208 Frretp Museum oF NATURAL History — Geo toey, Vot. III. 





EXAMPLE II 
FELIX 
Proc. U.S. Nat. Mus. Igo1, 24, 197 
Tentative Final 
Per Cent.} Mol. |Chromite/Leuc.| Nep.} An. | ——————|Deficit} Ak. }———_—— 
Diop.| Oliv. Diop:|Olv. 
Dt Oe meer 33-57 | 560 4. | 20 | 40 |154 1437.) "O05 )057eeecen 467 
PWNS NORE Jol a 3°22 31 Rha ges ly o28, ae me - “Bes = 
Acie: Cae ete .80 5 5 gi 
FeO Awe 26:22) |) 364 5 ee be A ZL amd URS a) oa 
Nt Aion a ae i401 13 ay 77 1875 ye 7 I |874 
Mir Ono t ae .68 10 at a a ee Dae ee hE 
IM SOs te 19.74 | 493 i = Mee eA ; 
Cave en 5.45 97 PAI. TT 76 I 
Nas CO) eee .62 10 10 44 3 svi. 
Ka Ore ae 14 I I 
H, Cleves ge 16 
POs wok coos 2.59 
Nip ene .36 
CO eee.. See .08 
OT Oe ee OI 
Bee are 4.76 
Graphite 36 
rine are 99.79 
2% + 3Y +== 496 = available Si O2 
x + 4y = 77 = molecules of CaO 
bia z = 875 = molecules of Mg O + FeO. 
Whence, x = I = diopside, y = I9 = akermanite, z = 874 = olivine. 
Formula Mol. Wt. Norm 
K. O.Al, 03.4 Si Oo... I X 436 = leucite = 2 dade 28 
Naz O.Al; O3.2 SiOz. 10 X 284 =nephelite = 2.84 3: { Sal 8.84 
Ca O.Al, QO3.2 Si O2.. 20 K 278 = anorthite = 5.56 PF 5756 
Ca, O59 Oop eh ese I X 116 
Mg O.Si On...... 5 X 100 + = diopside = / “20 ee .24 
Fe.0.51 Oo won en See 
EA ORS B NO — F 492 X 70) = olivine = 73-40 ) 
p2ike OS Osa. ae 382 X 102 3 O 81.08 | Fem 90.24 
a (Sa a not Wate rece 19 X 404 =akermanite = 7.68 \ 
He OCs Oe alee Jee 5 X 224 = chromite =. 725 ae Tet? 
Pe le see op ott tee = troilite =. 42760 
Pe ON aes tn te nickel-iron = 3.045 A ee 
He O = .16 
graphite = .36 
99.60 
Perfemic Persilicic Perpolic 
Dal 884s ee OM meee: Ave PO _ 61325eee a 
Fema OG tea oe Ate) 2 7480 .’ Mo eee I 
Perolic Permirlic Permiric 
Rite ieee om: Ca OF ig Ol Fe ON Ge a7 MgO + FeO _ 3800 @ 
OES. 08 eaere Naz O lOve Ca O ee 
Magnesiferrous 
NIE O See 20 Ieee a 
FeO 387-37 5 
