This is a fragment of the Mokoia meteorite, which was seen to fall near Whanganui on 26 November 1908. The tiny spheres are called chondrules, one of the typical features of stony meteorites. Each green bar on the scale represents 1 centimetre.
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Permission of Canterbury Museum, Rolleston Avenue, Christchurch, New Zealand must be obtained before any re-use of this image.