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2 results

  • The lead silicates from Franklin, New Jersey: occurrence and composition

  • Pete J. Dunn
  • Journal:
    Mineralogical Magazine / Volume 49 / Issue 354 / December 1985
    Published online by Cambridge University Press:
    05 July 2018, pp. 721-727

  • The lead silicate minerals from Franklin, New Jersey, occurred in two separate assemblages. One of these is characterized by esperite associated with hardystonite and occasional larsenite. The second assemblage can be considered as two parts: one consists of margarosanite, barysilite, nasonite, and ganomalite; the other contains roeblingite and hancockite, together with a number of highly hydrated phases. Chemical analyses indicate that these species conform to their theoretical compositions. There are no simple lead silicates at Franklin; all are compound silicates of Pb with Mn, Zn, and Ca.