(ˈ)mag|mad.ik, (ˈ)maig- adjective
Etymology: International Scientific Vocabulary magmat- (from New Latin magmat-, magma ) + -ic
: of, relating to, or derived from magma
water may fall originally as rain, or it may be magmatic water from the bowels of the earth which ascends to the surface as the steam of volcanoes or in hot springs — National Geographic
— compare meteoric