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Hungry Hill, Guilford, New Haven Co., Connecticut, USA

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Detailed Mineral List:
Almandine
Colour: red
Description: In the gneiss, but separate from the grossular-vesuvianite veins.
Reference: Hovey, E. O. (1888), A Cordierite Gneiss from Connecticut. American Journal of Science, Third Series, Vol. 36, No. 211, pp. 57-58.; Foye, W. G. (1949), The Geology of Eastern Connecticut. Connecticut Geological and Natural History Survey Bulletin 74, p.83.
'Biotite'
Reference: Harold Moritz
Cordierite
Habit: anhedral to stubby subhedral, prismatic
Colour: violet, smoky blue, deep blue to light blue; dichroic
Fluorescence: none
Description: In a biotite, quartz, and plagioclase gneiss. Crystals to several cm, best formed in quartz-rich zones. Some gems have been cut from this material - see gem display at the American Museum of Natural History in New York City.
Reference: Januzzi, 1976. Mineral Localities of CT and Southeastern NY State; Rocks & Minerals (1995) 70:396-409; Hovey (1888)
Photo: © 2013 Harold Moritz. Cordierite from Hungry Hill, Guilford, New Haven Co., Connecticut, USA
Grossular
Habit: dodecahedral
Colour: orange-brown, yellowish red
Description: "The garnet also is massive, but it shows many crystalline points of clear material. Its color is yellowish red, and its appearance entirely different from that of the deep red individual garnets which are so common in the gneiss....The veins vary from half an inch to four inches in width coincide with the bedding of the gneiss, and are seen for only 100 feet on the east side of a ledge but fifty feet wide. No cordierite was found in this ledge. Many garnets of value as gems have been taken from the ledge in the last six years." Hovey, 1888.
Reference: Welseyan University collection
Photo: © 2016 Harold Moritz. Grossular from Hungry Hill, Guilford, New Haven Co., Connecticut, USA
Rutile
Habit: prismatic
Colour: metallic exterior with red interior
Description: One specimen with crude, unterminated, elongated prismatic crystals to 22 mm with square cross-section in massive quartz.
Reference: Former Russ Jones collection
Photo: © 2016 Harold Moritz. Rutile from Hungry Hill, Guilford, New Haven Co., Connecticut, USA
Sillimanite
Habit: acicular
Colour: white
Description: As inclusions in the cordierite according to Hovey (1888).
Reference: ex- Neil Wintringham collection (No. 399-1); Hovey (1888)
Photo: © 2009 Peter Cristofono. Sillimanite from Hungry Hill, Guilford, New Haven Co., Connecticut, USA
Vesuvianite
Habit: anhedral to subhedral prismatic
Colour: dark green
Description: Associated with the yellowish red garnet in hornblende schist and gneiss
Reference: Foye, 1949. The Geology of Eastern CT, p.83; Hovey (1888).

References

Hovey, E. O. (1888): A Cordierite Gneiss from Connecticut. American Journal of Science, Third Series, Vol. 36, No. 211, pp. 57-58.

Foye, W. G. (1949): The Geology of Eastern Connecticut. Connecticut Geological and Natural History Survey Bulletin 74, p.83.

Januzzi, Ronald E. (1976): Mineral Localities of Connecticut and Southeastern New York State. (Taylor Assoc./Mineralogical Press).

Ryerson, Kathleen. (1976): Rock Hound's Guide to Connecticut. Pequot Press.

Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue), Vol. 70, No. 6, p. 403.

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