NASA Scientists Discover Unexpected Mineral on Mars (Tridymite)Jet Propulsion Laboratory- Jun 22, 2016Scientists have discovered an unexpected mineral in a rock sample at Gale Crater on Mars, a finding that may alter our understanding of how the planet evolved. ...Cool, fast meteorite races across sky over HalifaxTheChronicleHerald.caHopefully a meteor? Did anyone else see this?” wrote user