Enstatite, Rumuruti, and Kakangari Chondrites


Classification of Enstatite, Rumuruti and Kakangari Chondrites

A summary of the diagnostic mineralogic and chemical characteristics of these groups of chondrites is given in the table below.

EHELKR
Type meteorite (other examples) Qingzhen HvittisKakangariRumuruti
Chemistry1Abundance
patterns
RLE = 0.87 x CI RLE = 0.83 x CI RLE = 0.9 x CI RLE = 0.95 x CI
Mean Mg/Si0.730.87 0.93
Mean Al/Si0.0500.058 0.070
Mean Ca/Si0.0360.038 0.053
Mean δ18O~5~2.5~6
Mean δ17O~2.5~ -1~5.5
Color2   dark gray (buff when weathered)
Approximate chondrule abundance
(vol. %)
60-8027>40
ChondruleSize (mm)0.20.60.60.4
Types 4 PO (0.1), POP (4), PP (77), granular (1), BO (0.1), RP (13), CC (5) porphyritic (~87), nonporphyritic (~13) - porphyritic (~92), nonporphyritic (~8)
Ca-Al Inclusions (vol. %)<1<1<<10
Matrix (%)2-15 32-15 37335
Dominant matrix silicate-- enstatite -
Ni-Fe metal (vol. %)101070.1
OlivineFa (mol. %)0.40.42.2 39
FeO/MnO-- 70-88

NOTES. 1 RLE = refractory lithophile elements, VE = volatile elements. 2 Assuming low levels of terrestrial oxidation that colors the rock interior light to red brown. 3 Matrix abundances of EH and EL chondrites is poorly determined. 4 Chondrule types (percentage): PO = porphyritic olivine; POP = porphyritic olivine-pyroxene; PP = porphyritic pyroxene; BO = barred olivine, RP = radial pyroxene, CC = cryptocrystalline.