Table 1

Selected electron microprobe analyses of orthopyroxene and clinopyroxene. Web, websterite; Clinopx, clinopyroxenite; Chrom, chromitite.

LojaneRadusa Rabrovo
Sample no.48-142-357-157-157-657-659-757-557-559-7RA1RA1RA2
Rock typeWebWebWebWebWebWebChromWebWebClinopxWeb
Wt%
SiO253.4953.7451.9353.3153.5256.2353.4253.3654.8453.9653.7956.7654.02
TiO20.150.130.250.110.050.090.060.080.050.050.000.020.08
Al2O32.321.471.90.831.641.371.121.211.351.111.151.180.69
FeO2.842.588.5321.543.9310.081.755.0713.71.623.119.62.06
Cr2O30.460.560.210.040.340.21.820.40.251.780.440.261.36
MnO0.070.030.130.370.060.280.080.10.260.140.20.270.01
NiO0.020.000.020.150.020.110.030.120.000.040.000.000.05
MgO16.9917.8914.5423.317.0631.6217.2616.4129.2317.4617.5131.9517.48
CaO24.1424.3722.790.7523.420.6323.8423.890.5424.1924.030.6225.16
Na2O0.050.100.160.010.110,000.430.100.010.370.110,000.15
K2O0.000.000.000.000.000.000.000.000.000.000.000.000.00
Total100.53100.87100.46100.41100.15100.6199.81100.74100.39100.72100.34100.66101.06
Atomic concentration based on 6 O
Si1.9391.9421.9311.9711.9531.9641.9511.9521.9531.9521.9581.9741.953
Ti0.0040.0040.0070.0030.0010.0020.0020.0020.0010.0010.0000.0010.002
Al0.0990.0630.0830.0360.0710.0560.0480.0520.0570.0470.0490.0480.029
Fe0.0860.0780.2650.6660.1200.2940.0530.1550.4080.0490.0950.2790.062
Cr0.0130.0160.0060.0010.0100.0060.0530.0120.0120.0510.0130.0070.039
Mn0.0020.0010.0040.0300.0020.0240.0020.0030.0210.0040.0060.0230.000
Ni0.0010.0000.0010.0120.0010.0080.0010.0040.0080.0010.0000.0080.001
Mg0.9180.9640.8060.0040.9280.0030.9400.8950.0000.9410.9500.0000.942
Ca0.9370.9440.9081.2840.9161.6460.9330.9361.5520.9370.9371.6570.975
Na0.0040.0070.0120.0010.0080.0000.0300.0070.0010.0260.0080.0000.011
K0.0010.0000.0000.0010.0000.0000.0000.0000.0000.0020.0000.0000.000
XMg %91.42892.51675.24265.85388.55884.83294.61985.23079.18495.05390.94085.57893.800