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Almandine schorl and sillimanite locality, Haddam, Middlesex Co., Connecticut, USA

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Latitude & Longitude (WGS84): 41° 28' 19'' North , 72° 30' 39'' West
Latitude & Longitude (decimal): 41.4722222222, -72.5111111111


Williams (circa 1945) writes: "Sillimanite, Garnet, and Tourmaline with splendid terminations translucent of a dark brown color, occur one hundred yards east of the Killingworth Road near the Norman Spencer house." Evidently, based on his accompanying map, the "Killingworth Road" is Jail Hill Road (not what we now know as state Rt. 81). His map places the locality between Jail Hill Rd. and the quarries on top of Great Hill, the coordinates, based on this, are approximate. However, London (1989) maps a small body of rock in this precise area he called "mfs", which is a muscovite-feldspar schist containing accessory tourmaline, garnet up to 30% and sillimanite commonly as large prisms, fibrolitic mats and nodules with quartz. Based on analyses of typical schist and gneiss hosted garnets in Connecticut, the species is almost certainly almandine. The tourmaline is very likely schorl, based on the black color and absence of Mg minerals in the schist matrix.

Mineral List


3 valid minerals.

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References

Williams, Horace S. (1945 [circa]), Article for New York Society of Mineralogists. Brainerd Public Library, Haddam, Connecticut.

London, David. (1989), Bedrock Geology of the Moodus Seismic Area, South-Central Connecticut. State Geological and Natural History Survey of Connecticut Report of Investigations No. 11.

 
Mineral and/or Locality  
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