Abstract
The composition of the minerals constituting the Norton County achondrite has been ascertained by measuring a large number of individual grains of each mineral, using electron microprobe techniques. The following minerals were found: enstatite, forsterite, metallic nickel-iron, metallic copper, daubreelite, troilite, and two new species, titanoan troilite and ferromagnesian alabandite. The unusual association of minerals indicates that at the time when this meteorite was formed the environment was strongly reducing, and any hypothesis on the origin of meteorites based on comparison with terrestrial rock-forming mechanism must take this into account.
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