Wawayandaite

General Information: Chemical Formula:Ca12Mn4B2Be18Si12O46(OH,Cl)30 [Ortho·] Composition:(Molecular Weight = 2,523.08 gm)Calcium 19.06 % CaManganese 8.71 % MnBeryllium 6.43 % BeSilicon 13.36 % SiBoron 0.86 % B Hydrogen 1.08 % H Chlorine 4.22 % ClOxygen 46.29 % O  Empirical Formula: Ca12Mn2+4B2Be18Si12O46(OH)27Cl3 Environment:Found in a museum specimen of willemite. IMA Status:Approved IMA Locality:Franklin mine, Franklin, Sussex County, New Jersey, USA. Name Origin:Named from the Lenni Lenape Native American word "wawayanda," many or several winding, in allusion to the grossly curved and winding habit of its crystals.Physical Properties: Cleavage:[100] Perfect Color:colorless or white. Density:3 Diaphaniety:Transparent Habits:Platy - Sheet forms (e.g. micas)., , Hardness:1 - Talc Luster:Pearly Streak:whiteMore details...