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ardennite (ar-den'-nite). A yellow to yellowish-brown orthorhombic mineral: Mn2+4(Al,Mg)6(SiO4)2(Si3O10)[(As,V)O4](OH)6 .
ardennite (ar-den'-nite). A yellow to yellowish-brown orthorhombic mineral: Mn2+4(Al,Mg)6(SiO4)2(Si3O10)[(As,V)O4](OH)6 .