430 I Si EO VOCE 
is connected another quite subordinate variety of norite (see 
the analysis in the chapter on norite in Part Il). The entire 
MINERALS AND ROCKS FROM ROMSAAS 
aa 
z = ORBICULAR Pas 
oy 5 = NoriTtE ze 
SSIGRES | fa PLAGIOCLASE 8 Bin Z Ay 
a | & 2 | gs EE 
Bie 3 | FF | aer jamal 22 
No 41 42 43a 43 43¢ 44 45 46 48 
SiOw: 2084: 53-3.| 37-04] 52-33) 50: 25) 57-55) 542 55on. 25mg 75 |52.86 
MI Ose pests |e Sao | eeaeteell icant ed | eter rs Gi 0.58] 0.40] 0.5 an 
ALO;..... 3.0/| 20.15] 29190] 27.03 27-20) 4. 45|) 21556) 9 1086 os 
FesOy ee T.2\ g2| 0-51] 0-45] 0.32] 0.50) 0.22] 0.4 35 |(0.47) 
COW ne: cA CAE Aaie  sk| SeaUaN AG ae aN 24 14.50] 1.509] 10.6 g2 |11.81 
MnO ie ©: 30/2 (O40) oes eee eel leet ©.50| 0.20] ©.4)|" (0.46/22 eee 
WIEO) so oo oe 23.7 | 16.44] 0.97] ©.19| ©.14| 22.08) 1.85] 16.0 61 |I7.15 
CaOe eee 20) |) O70] LE.04|) 19 4)50| sO ROS | 2 On| ames mere 4.58 
NazO\2 22 dee 2.57| 4.80] 5.40] 6.01] 0.64) 4.44] 1.7 1428 
KOZ eae ence 7.01] 0.42] 0.16] 0.26] 0.56] 0.74] 0.65 1.03 
BLO cas cl Reet T2312. ceet hal een | otencnee ©. Ll (On5 2 Or23 0.53 
le eee eereme lato rralore TsO) ee tare 0422.0 2710) 1252 On40|tO 0.99 
Total .|100.0 | 99.93|100. 66/100. 28/100. 43] 99.36|100.77| 99.6 |100.57 |99.87 
EXPLANATION 
No. 41: Hypersthene (somewhat changed to hornblende) from the orbs, the 
medium of four well-conformable analyses, by Hiortdahl (2), Meinich, and 
Chrustschoff.—No. 42: Biotite from the orbicules by Bugge.—No. 43a-c: 
Different analyses of plagioclase from the intervening mass between the orbs, 
No. a (from the kernel of the plagioclase) by Meinich, Nos. 8, c (fromthe exterior 
parts of the plagioclase) by Chrustschoff.—No. 44, the orb, and No. 45, the 
intervening mass between the orbs, by Bugge.—No. 46, the coarse-grained orbic- 
ular norite, calculated by myself, and originating from 70 per cent orbs (No. 
44) and 30 per cent intervening mass (No. 45).—No. 47 orbicular norite with 
smaller orbs, analyzed by Bugge.—No. 48, the ordinary norite, analyzed by 
Bugge, whose analysis applies to a rock with 3.88 per cent pyrrhotite which 
I have deducted from the analysis, and recalculated to the sum found. 
igneous field' has an area of only ca. 65,000 sq. m. In some 
places, in part directly at and in part quite close to the boundary 
of the norite field, the rock has an orbicular structure. We may 
« See map and profile in Beyschlag, Kreusch, Vogt, Erzlagerstdtien, I (2d ed., 1914), 
Fig. rot. 
ks eee 
