Abstract

Wawayandaite, a new mineral from Franklin, New Jersey, is found associated with willemite, friedelite, and numerous other minerals. It is monoclinic, space group P2/c or Pc, with a = 15.59(2), b = 4.87(1), c = 18.69(4) Å, β = 101.84(15)°, Z = 1. Chemical analyses yielded BeO 17.6, MgO 1.9, CaO 24.8, MnO 9.8, ZnO 1.1, B2O3 3.8, SiO2 28.2, H2O 9.6, Cl 3.0, less O ≡ Cl 0.7, total = 99.1 wt%. The idealized chemical formula is Ca12Mn4B2Be18Si12O46(OH,Cl)30.

Wawayandaite occurs as colorless platy crystals with a pearly luster; many are strongly curved. Cleavage is perfect on {010}, Dmeas ≃ 3.0, Dcalc= 2.98 g/cm3. It is biaxial, negative, with 2V= 85°, α = 1.619, β = 1.631, and γ = 1.641.

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