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Sikhote-Alin Iron Meteorite: A fine example of a Sikhote-Alin iron meteorite, weighing 409.9 grams, which was seen to fall in eastern Russia in February of 1947. This meteorite is described as an individual, as it is a complete mass (rather than an exploded shrapnel fragment) which fell to earth on its own. Note the abundant overlapping regmaglypts (thumbprints) caused by surface melting as the meteorite flew through our atmosphere. Regmaglypts are one of the key surface features used to identify meteorites. Sikhote-Alin is a coarsest octahedrite iron in the group IIB, and is comprised of approximately 93% iron, 6% nickel and 1% trace elements.