Népouite
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Népouite is a rare nickel silicate mineral which has the apple green color typical of such compounds. It was named by the French mining engineer Edouard Glasser in 1907 after the place where it was first described, the Népoui Mine, Népoui, Poya... Wikipedia
Crystal class: pyramidal (mm2); (same H-M symbol)
Crystal habit: generally massive, also fibrous and microscopic pseudohexagonal platy crystals
Crystal system: Orthorhombic