CompositionNew analysis of this strongly shock-metamorphosed iron meteorite has shown a content of 8.4% nickel and trace amounts of rare elements—0.33 ppm gallium, 0.133 ppm germanium and 1.6 ppm iridium. It also contains the minerals chromite, daubréelite, schreibersite, akaganéite and inclusions of troilite.^[3] For the first time, analysis has proved the presence of a form of quartz altered by extremely high pressure—stishovite,^[3] probably a pseudomorphosis after tridymite. From the article "First discovery of stishovite in an iron meteorite":^[2]

Stishovite, a high pressure polymorph of SiO₂, is an exceptionally rare mineral...and has only been found in association with a few meteorite impact structures.... Clearly, the meteoritic stishovite cannot have formed by isostatic pressure prevailing in the core of the parent asteroid.... One can safely assume then that stishovite formation (in the Muonionalusta meteorite) is connected with an impact event. The glass component might have formed directly as a shock melt....