Northeastern Section–41st Annual Meeting (20–22 March 2006)
Paper No. 17-1
Presentation Time: 1:00 PM-4:00 PM

A NEW SERENDIBITE LOCALITY IN THE GRENVILLE PROVINCE (ORANGE COUNTY, NEW YORK)

RADER, Erika L. and PECK, William H., Department of Geology, Colgate University, 13 Oak Drive, Hamilton, NY 13346, wpeck@mail.colgate.edu

A new locality of the rare borosilicate Serendibite (Ca2(Mg, Al)6(Si,Al,B)6O20) was discovered during regional sampling for calcite-graphite carbon isotope thermometry of the Franklin Marble. The Mesoproterozoic Franklin Marble consists of a main band that extends ca. 30 km from Orange County, NY into Sussex County, NJ and also has outliers in Warren County, NJ. The serendibite studied is from an unremarkable course-grained calcite marble outcrop 1.8 km from Edenville. Serendibite occurs in layers rich in pargasitic amphibole. This locality is >1/2 km from the nearest mapped intrusive body. Equant serendibite showing polysynthetic twinning occurs with green amphibole, apatite, phlogopite, calcite, scapolite, and sinhalite (MgAlBO4). Some serendibite is altered to uvitic tourmaline. This occurrence of serendibite in a calc-silicate layer of the Franklin Marble of New York joins other three other Grenville Province localities: near Johnsburg in the Adirondack Highlands, near Russell in the Adirondack Lowlands, and another possible locality in Orange county (Amity). Serendibite, sinhalite, and tourmaline at this locality most likely result from metamorphism of a boron-rich sedimentary protolith.

Northeastern Section–41st Annual Meeting (20–22 March 2006)
General Information for this Meeting
Session No. 17--Booth# 16
Advances in Mineralogy: From Field Association to Phase Equilibria (Posters)
Radisson Penn Harris Hotel and Convention Center: Ballroom South
1:00 PM-4:00 PM, Monday, 20 March 2006

Geological Society of America Abstracts with Programs, Vol. 38, No. 2, p. 25

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