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Hungry Hill, Guilford, New Haven Co., Connecticut, USA
Detailed Mineral List:
| Biotite | ||
| Reference: | Harold Moritz | |
| Cordierite |  | |
| Formula: | (Mg,Fe)2Al3(AlSi5O18) | |
| 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: © 2008 J. Zolan. Cordierite from Hungry Hill, Guilford, New Haven Co., Connecticut, USA | ||
| 'Garnet' | ||
| Formula: | X3Z2(SiO4)3 | |
| Habit: | anhedral to subhedral | |
| Colour: | yellowish red, deep red | |
| Fluorescence: | none | |
| Description: | Two types of garnets were reported by Hovey (1888): massive yellowish red garnets associated with vesuvianite and subhedral partly gemmy, deep red garnets elsewhere in the gneiss. | |
| Reference: | Foye, 1949. The Geology of Eastern CT, p.83.; Hovey (1888) | |
| Sillimanite |  | |
| Formula: | Al2(SiO4)O | |
| 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 | ||
| Formula: | (Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10 | |
| 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). | |
5 entries listed. 3 valid minerals.
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.
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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