Veevers crater-forming iron meteorite 
55 
Max. thickness (cm) 
or plessite was encountered. However, it is likely 
that the undisrupted Veevers meteorite contained 
residual taenite. 
a 
Weight (grams) 
Figure 3 Dimensional and mass analysis of meteorite 
fragments found at Veevers crater; (a) 
fragment thickness frequency, (b) mass 
frequency. 
bandwidth of the original octahedral structure. The 
average thickness of fragments > 3 g is 8.6 mm 
(Figure 3a), whereas the average thickness of 
fragments > 5 g is 9.6 mm. These dimensions 
indicate a coarsest octahedral (Ogg) structure, and 
correspond well with the bandwidths (9 - 10 mm) 
of other group IIAB irons with similar Ni contents 
(cfl. 5.8 wt%) that have been described (Buchwald 
1975). 
Group IIAB irons with bulk Ni contents greater 
than 5.5 wt% frequently contain some residual y- 
taenite or plessite (a+y) (Buchwald, 1975). The 
frequency of taenite or plessite fields in these 
meteorites rarely exceeds one in sectional areas 
ranging from 10 - 25 cm 2 . The bulk Ni content (5.82 
wt%) of Veevers (Wasson et al. 1989) suggests that 
some residual y-taenite should be present in the 
meteorite. In the small sectional area of the residual 
fragments of Veevers examined (< 4 cm 2 ) no taenite 
Figure 4 Details of the microstructure of Veevers 
meteorite fragments, (a) Schreibersite [s] 
showing incipient reaction haloes with 
surrounding kamacite [k]. (b) Kamacite 
containing abundant rhabdites, degenerated 
Neumann bands and lamellae of an 
unidentified mineral [x], probably roaldite. 
(c) Sinuous line of stained metal (probably 
decomposed roaldite) cut and translated by a 
zone of shear deformation (arrowed). 
Surrounding metal transformed to ragged a 2 - 
kamacite. Scale bars 100 pm (2% nital etch). 
