The Lead Silicates from Franklin, New Jersey: Occurrence and Composition

Pete J. Dunn
Department of Mineral Sciences, Smithsonian Institution, Washington, DC 20560, USA

Abstract: 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.

Keywords: lead silicates • barysilite • esperite • ganomalite • hancockite • larsenite • margarosanite • nasonite • roeblingite • Franklin • New Jersey • USA

Mineralogical Magazine; December 1985 v. 49; no. 354; p. 721-727; DOI: 10.1180/minmag.1985.049.354.12
© 1985, The Mineralogical Society
Mineralogical Society (