I’ve never heard of c2n2 showing up in meteorites. Used in rocketry? Yes! Have any links on that?
Many meteor showers are associated with the orbits of comets, therefore the origin of some meteors would be comet fragmentation. Many comets contain cyanogen, so many meteorite showers associated with their orbits will as well.
As a for instance, fairly recently, a meteor struck near a Peruvian village, emitted a very strong odor, sickening hundreds of villagers as well as police. Investigators wearing gas masks reported strong nasal and respiratory irritation through their gas masks.
Some attribute the respiratory distress and illness to cyanogen. Others attribute it to the heat of the meteorite fusing elements in the soil itself along with a high water table, emitting steam containing arsenic among other substances.
http://astronomer.proboards.com/index.cgi?board=meteors&action=display&thread=319