Where did the ice crystals come from? Probably from an ordinary cirrus cloud, which happened to be floating by when Mauna Loa erupted. There is another possibility, however. The volcano itself spewed water vapor into the air, freezing when it reached cirrus cloud-altitudes. If so, Mauna Loa provided both the light and the ice.
Amateur astronomer Frankie Lucena has been monitoring Gemini cloudcam footage since Mauna Loa blew its top. On Dec. 1st he caught this fireball:
More sky phenomena may be in the offing. According to the USGS, Pele's hair (strands of volcanic glass) fragments are being wafted great distances from the volcano's vent, while approximately 180,000 tons of sulfur dioxide (SO2) are entering the atmosphere every day.