532 I Ea VOGL 
crystallization in the deep-seated rocks of olivine and mono- 
clinic, or orthorhombic, pyroxene must be explained by the same 
laws as for the other ordinary rock-forming minerals, and that the 
individualization boundary lies at predominant pyroxene: little 
olivine. 
ON THE RELATION BETWEEN MgO AND FeO (OR BETWEEN 
Mg-SILICATE AND Fe-SILICATE) IN THE FERROMAGNESIAN 
SILICATES, CRYSTALLIZED FROM THE SAME MAGMA 
_ We include a selection of analyses of the primary ferromagnesian 
minerals appearing in the same rock: , 
No. | SiOz | Ti02 Cr.0; Al,0; Fe.0; FeO | MnO MgO CaO | Na.0| K.0 P.O; H20 Total { 
Websterite (No. 40) with Bronzite (b) and Diopside (c) 
5 oo 
Websterite..... 49 |52.55| 0.14] 0.44 | 2.71] 1.27 | 4.90] 0.24/20.39|16.52] 0.27 Tr. | 1.009|100.52 
Bronzitesseeeee Wek SBlecse. Onste) || WHO wea ye) Ih IDOI) OAS) ie|| BoA acaaliaon-|losoc- I.14|100.56 
Diopside....... (BN \eenttell @oreil) Coope fh Gere) cece) |) ciate] ADies flee oF .C | ococalfanccl.- 505 0.65) 98.84 — 
Pikrite (No. 50) with Bronzite (b) and Diopside (c) 
Pikriteseeeeecnrs Fe) ley7/ot2|| Oovlls doo oe 4.06| 8.92 | 7.62] 0.40/26.92| 6.14] 0.40]0.49| 0.10] 5.04|'98.60 
Bronzite....... Dime 5 4t20) eee nH) || BAOG)lo 50050 TOROS AEE ANCL) aK ccgallascc|leancs 0.42! 98.53 
Diopside....... @ ||KAsCBllocacs OL? || BeAANooocee O84! mere PP ERIMADCA ls secallaccolleoac- ©.57\|100. 
Hypersthene Diabase (No. 51) with Hypersthene (b) and Augite (c) 
Diabaseseen. so me lets socollaon boc 7305) lente TPenuisll gees T8.93)|13.20)) 2434) OnZO eevee | eee 100.00 
Ey persthenes -es|/00 052600) renee) ners 3.00] 0.43 |15.16| 0.36}21.80] 5.94] 0.16]0.04]..... 0.08] 99. 2¢ 
ANWEUSS ooo genes Wi Xillaoon dilpcocss OQoUS|) OoL7 |) OcC5illod ass 14.58/16.36| 0.55|0.19]..... 0.25] 99. 
: | . 
Diallage-Hornblende-Gabbro (No. 52) with Diallage (e) and Brown, Primary Hornblende (d) ; 
Gabbro........ 5A lelats)\| O.2Gllocccoc 1r.42| 1.74 | 8.15] 0.17|10.84|11.01| 2 97/0.31|.....|....- 
Diallareeeeeeee GB 5623 Salo is6 oc 2. 75||| 31.88 |£4..00]| Dr. |£7-05)|) Ok74i\- se ellemereiileleites 
——e 
IHornblendese a) 0145204 eee eee 8.98 THOM oo ace BCG Allocano|l-osclleooad|laccd "% 
. Dacite (No. 53) with Hypersthene (6), Biotite (e). and Ilmenite (f) 
DAciteseereeer 33 KO. 27) PoBOloo oace 16.50] 0.68 | 5.10] 0.03] 2.48] 4.18] 2.36/2.68 
Hypersthene...] 0 |50.42] 3.5I]...... 4.06] 2.10 |23.54| 0.24/13.04| 1.30] Tr. |o.69 
Biotitesn-eeeere G  NEXe) 810) W/-@Elloncane II.13| 1.39 |18.10| 0.58] 9.88] Tr. | 0.35|6.73 
Ilmenite....... a ean ener CW NCT lee oii |code | alee ERenOVAll niga CMe) Gace al lasence lac c 
Peridotite (No. 54, Kimberlite, Strongly Decomposed) with Olivine (g), 
Garnet (i), and Ilmenite (/) 
0.11/0.20| 0.35] 8. 
.43 | 2.01] 5.16 | 4.35] 0.23/32.41 9 
6] 0.08]0.21] 0.04] o. 
4 
3 
° 7 
.24 | 0.39| 2.36 | 7.14] 0.20/46.68] 1 
.Qr |2r.21| 4.21 | 7.93] 0.34|190.32| 4- 
.74 | 2.84] 9.13 |27.81| 0.20] 8.68] o 
Peridotite...... 54 |29.81| 2.20 
Olivine) i. >... g |40.04| 0.07 
Garmeteae eee |i Aange|onno 
Ilmenite....... if 0.76/49.32 
0,07 
oooo°o 
