Granite pegmatite. M. P. Gillette began mining here in 1896 for gem tourmalines, mineral specimens, and commercial grade feldspar. (Pawloski 2006)
References:
Foye,W. G. (1922): Mineral Localities in the Vicinity of Middletown, Connecticut. (American Mineralogist 7:4-12)
Gillette, Sterling G. (1937): Some Minerals of the Gillette Quarry, Haddam Neck, Conn. (Rocks & Minerals 12:333)
Stobbe, Helen (1949): The Gillette Quarry, Haddam Neck, Conn. (Rocks & Minerals 24:496)
Scovil, A. (1992): Famous Mineral Localities: the Gillette Quarry, Haddam Neck, Connecticut. (Mineralogical Record, 23(1):19-28.)
Pawloski, John A. (2006). Connecticut Mining (Mt. Pleasant, SC: Arcadia Publishing) pp. 51-54.
Mineral List:57 entries listed. 44 valid minerals. 1 type locality (other). 1 erroneous literature entry.
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