Jerrygibbsite

General Information: Chemical Formula:(Mn,Zn)9(SiO4)4(OH)2 Composition:(Molecular Weight = 902.02 gm)Manganese 51.77 % MnZinc 3.62 % ZnSilicon 12.45 % SiHydrogen 0.22 % H Oxygen 31.93 % O  Empirical Formula: Mn2+8.5Zn0.5(SiO4)4(OH)2 Environment:Metamorphosed Zn-Mn deposit. Dimorphous with sonolite. IMA Status:Approved IMA Locality:Franklin mine, Sussex County, New Jersey, USA. Name Origin:Named for Gerald V. Gibbs (1929-), Virginia Polytechnic Institute, Blacksburg, Virginia, USA.Physical Properties: Cleavage:[001] Imperfect Color:violet pink. Density:4 Diaphaniety:Transparent to Translucent Habits:Massive - Granular - Common texture observed in granite and other igneous rock., , Hardness:5.5 - Knife Blade Luminescence:Non-fluorescent. Luster:Vitreous (Glassy) Streak:light pinkMore details...