Latitude: 41°17'28"N
Longitude: 73°13'51"W
A well-known construction site locality bordering the NW side of Old Mine Park (Hubbard) Tungsten Mine, both sites have a mineral assemblage unique to the state. The original development as a retail plaza was abandoned and in late 2009 construction began on a Home Depot store that was completed in January 2011.
This locality, like the neighboring Old Mine Park, is underlain by gently dipping amphibolite and marble. The amphibolite contains layers and boudins of green plagioclase (albite?) and quartz and very coarse-grained fan-shaped aggregates of pale greenish-white scapolite group with sulfides. Excellent specimens of fluorescent
scheelite are found in the amphibolite cut along the east edge of the property, especially where it is altered to a pale gray-brown clinozoisite. The marble contains grossular and diopside.
Cross-cutting veins contain the same muscovite-
topaz-fluorite var.
chlorophane-quartz assemblage found in the surrounding area. Excellent pale green
beryl crystals are found at the contact of cross-cutting calcite-scapolite-clinochlore-fluorite-sulfide veins with the amphibolite, which is metasomatically altered to scapolite-phlogopite along the contact. Heitner (1998) indicates the material recovered was beryl, with no mention of emerald. The report of true emerald from this locality remains controversial and any trace quantities of chromium or other coloring agents that might or might not exist in beryl from this locality do not yield true emerald color at this locality, although some unanalyzed beryls from this locality have a peculiar greenish yellow tinge.
There are many small brittle faults cross-cutting the host rocks and open cavities in the faults contain excellent poker-chip calcite, purple to green fluorite, sulfides, and quartz. One extremely rusty fault breccia with abundant pyrite was exposed near the center of the site.
One word of caution, much rock fill was brought in to grade the site over the years and some collectors unfortunately have contaminated the site with discarded material from other localities. Only minerals found in the host matrix rocks/fault zones should be listed.
References
Heitner, H. (1998): Window of Opportunity, Field Collecting at Trumbull, Connecticut, Rocks & Minerals, May-June, p. 198.
Mineral List
60 entries listed. 49 valid minerals. 1 erroneous literature entry.
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