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Met Name

Met Type

Thin Sections

200.7 grams.   Iron, IIIAB

TKW 22.39 kg. Fall not observed. Plowed up sometime during 1953 - 1958. Turtle River, Beltrami County, Minnesota, USA.




   

jnmczurich writes:

Turtle River, little wedged fullslice 200.7 g with painted number H92.15 from former Glen Huss, Denver. Unfortunately without the related Glen Huss collection lable. Dimensions of the slice: 111 x 57 x (4-7) mm.

Recrystallized medium octahedrite, bandwith 1.10 ±0.20 mm, with well developed straight long kamacite lamellae (L/W ̴15). Turtle River is one of my favorite IIIAB irons in collection (former classification: IIIB).

Although the iron does not show an alpha-2 zone, i.e. the outer zone is already weathered-off, the iron is very stable and has not shown any signs of rusting for many years.

Received in exchange from an european University collection in 1994.

Pic 1 and 2 – both sides of the Turtle River slice

Pic 3 – Kamacite lamellae with recognizable recristallization (fine grains with different light reflection). Plessite fields are dark

Pic 4 – Comb or finger plessite field, embedded between kamacite bars

Pic 5 – Parallel arrangement of kamacite bars in different orientation. Small angular schreibersite inclusion inside of a kamacite bar

Pic 6 – Kamacite bars and various plessite fields

The detail images always show a field of about 8 x 5.5 mm.