![slice 1 detail [461 kb]](http://www.turnstone.ca/rom300s1.jpg)
Fig. 1: Detail of a 18x31-cm portion of a larger slice of iron meteorite that has been sawn, polished and acid-etched to reveal the Widmanstatten pattern id nickel-iron alloys and large crystals of the phosphide mineral schreibersite, swathed in kamacite. One of four large slices cut and prepared from a larger parent slab, itself clearly part of a much larger parent mass. This is Slice 1, 60 x 30 x 1.8 cm, 28.0 kg (61.5 lbs).
"Rock of the Month # 300, posted for June 2026" ---
The Seymchan meteorite
is a very large find in a remote region of eastern Russia. Seymchan is notable in the highly variable proportions of olivine and iron, the principal minerals: some are largely iron (the relatively nickel-poor and -rich phases kamacite and taenite, thus this is an iron meteorite) and some have closer to 50:50 proportions of olivine and iron, thus a pallasite, a form of stony-iron meteorite.
This page will examine a set of four large, circa 60x30-cm slices cut from one larger slab. Two slices to date have been donated, one to the Royal Ontario Museum in Toronto (#3, 33.2 kg, 2.1 cm thick), and one to the Arthur E. Seaman Mineral Museum in Houghton, Michigan (#2, 19.8 kg, 1.4 cm thick). The remaining two slices, numbered 1 and 4 (28.0 and 34.0 kg, 1.8 and 2.2 cm thick, respectively) will likely be sold in the next year or two.
IN PREP.
REFERENCES
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IN PREP.
DRAFT version, Graham Wilson, 25-26 April, 03 May 2026
For further information, see:
Rock of the Month Thematic Index
or, visit the Turnstone "Rock of the Month" Chronological Archives!