Table 2 The indexed peaks of the XRD pattern of the majorite (Mj) inclusion and synthetic majorite recovered from 14 GPa.

The calculated d spacings (dcalc) with a cubic unit cell parameter, a = 11.5675(2) Å, agree well with the observed d spacings (dobs) for the natural majorite inclusion. The synthetic majorite has a comparable unit cell parameter, a = 11.5688(54) Å.

Natural MjSynthetic Mj
hkldobs (Å)dcalc (Å)dobsdcalc (Å)dobs (Å)
4002.89212.89190.00022.8957
4202.58622.5866−0.00042.5912
3322.46672.46620.00052.4627
4222.36132.36120.00012.3615
4312.26862.26860.00002.2742
5212.11222.11190.00032.1116
4402.04482.0449−0.0001
5321.87671.87650.00021.8759
6201.82901.82900.00001.8324
4441.66971.66960.00011.6704
6401.60411.60410.00001.6033
6421.54571.5458−0.00011.5456
8001.44591.44590.00001.4465
7411.42421.42390.00031.4223
6531.38231.3826−0.00031.3821
8401.29331.29330.00001.2928
8421.26201.2621−0.00011.2624
7611.24741.24740.00001.2471
6641.23321.23310.00011.2337
8511.21931.21930.00001.2188
8531.16851.16850.00001.1674
10201.13431.13430.00001.1345
8641.07391.0740−0.00011.0734
10421.05611.05600.00011.0556
8801.02241.02240.00001.0226