True that, but there are multiple sites on earth where air burst meteors dumped enough energy into the atmosphere to melt desert sand the resulting glass is usually green, as are many fulgerites.
Also any city has abundant copper conveniently suspended up in the air for easy vaporization.
Nice to know about the copper at Alamogordo, though, thanks!
Libyan desert glass is yellow for some reason.
Darwin Australia meteor glass light to dark green, white or black.