[snip] cyanogen (CN)2 and diatomic carbon (C2) both glow characteristically green [/snip]
https://www.discovermagazine.com/the-sciences/actually-if-youre-a-comet-it-is-easy-being-green
Chondrities are also known to contain large amounts of CuZn...Copper gives off a blue green glow when burned...