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Becker Quarry (Becker's Quarry), West Willington, Willington, Tolland Co., Connecticut, USA

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Latitude & Longitude (WGS84): 41° 52' 19'' North , 72° 16' 24'' West
Latitude & Longitude (decimal): 41.8722222222, -72.2736111111


Most famous for its Tessin habit and sceptered quartz crystals, plus assemblage of magnesite, almandine, pyrite, tourmaline, and free-standing kyanite crystals. As described by Ague (1995), the host rock is a granulite facies mafic gneiss (metagabbro) consisting of anorthite (An70-80), clinopyroxene, orthopyroxene and biotite with accessory quartz, and retrograde magnesio-hornblende and cummingtonite. Hydrothermal vein minerals formed in open Alpine-type fractures that cross-cut the foliation of the bedrock when it was under amphibolite facies conditions - about 15-30 km deep and 500-550 degrees C. The most common assemblage is quartz-almandine-kyanite-magnesite-biotite-albite (An20-40)-ankerite-muscovite. Less common is quartz-almandine-magnesio-hornblende-magnesite-albite (An20-40)-ankerite-biotite. Also in the veins are accessory staurolite, fluorapatite, tourmaline, zircon, ilmenite, pyrrhotite and chalcopyrite crystals (and rutile not mentioned by Ague). Calcite and pyrite formed under lower P-T conditions much later. Many minerals are coated with a dull gray-green layer of very fine-grained, retrograde sericite/chlorite/clay.

This is an operating quarry and collecting is not allowed without permission, which in recent years is rarely given.

Mineral List


21 valid minerals.

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Scovil, J. (1994), What's New in Minerals. Mineralogical Record: 25: 377.

Zagielski, M., and J. Fast. (1994), A new occurrence of almandine, kyanite, and quartz in open veins in Willington, Connecticut (abstract). Rocks & Minerals 69: 136.

Ague, J. J. (1995), Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.

Weber, Marcelle H. and Earle C. Sullivan. (1995), Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 407.

Horowitz, Irving L. (2003), The Remarkable Quartz Crystals of West Willington, Tolland County, Connecticut. Rocks & Minerals: 78(4): 257-261.

Mineral and/or Locality  
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