Studying the mineral composition and structure of the Morasko meteorite, Buchwald (1975) noticed that kamacite had locally undergone an extensive change to a granular pattern, and the cohenite crystals had markedly recrystallized.
Several micrometeorite grains have unaltered kamacite cores, which is an additional evidence for their common origin with the meteorite fragments.
Selected microprobe analysis of the Morasko meteorite and micrometeorites (in per cent) Meteorite Kamacite Taenite O Si S 0.02 0.01 Fe 95.42 80.49 Ni 6.49 18.08 Mg Al Mn Total 101.1 98.6 [Fe.sub.3][0.sub.4] Fe00H Micrometeorites with low Ni content Sample 3/11 Sample PS/40 O 1.35 0.005 Si 1.18 0.004 S 0.01 0.001 Fe 55.93 62.97 Ni 0.001 0.001 Mg Al Mn Total 58.47 * 62.98 * [Fe.sub.3][0.sub.4] 77.2 86.9 Fe00H 88.9 100.1 Micrometeorite with high Ni content Sample 4/KKH O 6.77 Si 0.64 S Fe 87.04 Ni 4.66 Mg 0.05 Al 0.57 Mn 0.27 Total 100.0 [Fe.sub.3][0.sub.4] Fe00H * OH and O bounded with Fe were not analysed
Occurrence: In "plessite," an intergrowth of taenite and kamacite
; other associated minerals are: nickelphosphide, schreibersite, awaruite and graphite.
Occurrence: Associated minerals are: kamacite
, taenite, troilite and forsterite.
Occurrence: The grains in Indarch probably formed by exsolution of Si and N from kamacite
, perryite and schreibersite during parent-body metamorphism.