Assertion: tourmaline | /r/HasProperty | thought as pneumatolytic mineral
Facets:
value: like topaz
type: OTHER
Source sentences:
text: Like topaz, tourmaline is thought of as a pneumatolytic mineral for this reason; that is, one that results from the actions of hot gases and/or solutions, either in the late stages of cooling and crystallization of a magma or by the action on earlier-formed rocks of gases or solutions emanating from magmas.