Greenmarine is a Key Item in Xenoblade Chronicles 2. It is received from Misimisi during Precious Yearnings by having him appraise a Strange Mineral from a prospecting point south of the Nocclia Timber Site in the Gormott Province.
Misimisi states that "it is known as the national gemstone of Gormott. Is very beautiful jewel, and produces characteristic leafy pattern when soaked in water. Very popular gemstone with ladies, so likely to fetch good price."