#Peridot crystals are surfacing from magma. Still, while Peridots are beautiful, they're not worth volcanic exposur… https://t.co/KeyBA5O92I at https://t.co/KeyBA5O92I— Alex Cameron Dimez (@CamDimez) June 13, 2018
The green gems are olivine crystals, a common mineral found in Hawaii's lava. At jewelry quality, the mineral is called peridot. As the volcano erupts, it blasts apart molten lava, allowing for green olivine minerals to be separated from the rest of the melt and fall as tiny gemstones.
(UPDATE: The Univ of HI spokesperson disputed this report on the olivine, saying: 'What we’re seeing are tiny, and they do not separate from the lava themselves. So you have to crush the lava (to) get them out and find them.” Thanks to OEN member Carol Campbell for this updated info and link.)