Granite pegmatite. Berkshire pegmatite field. Found about 1811 by Dr. David Hunt of Northampton, Massachusetts. The locality was on the Joseph Clark farm. He may have spelled his name with a final "e": Clarke. This is the "type" locality for albite variety
cleavelandite as well as
microlite.
Hitchcock (1833) gives the following description: "The most noted locality of green and red tourmalines is in Chesterfield, on land of Mr. Clark. They are contained in an enormous vein of granite in mica slate, which corresponds nearly in direction with the layers of the slate. This granite is crossed obliquely by a vein varying in width from six to eighteen inches, of
smoky quartz and silicious feldspar: or rather the quartz forms the central part of the vein and the feldspar lies on each side of the quartz: the green red and blue tourmalines, with
schorl and sometimes
beryl passing through the feldspar and the quartz. This cross vein has been laid open from twelve to twenty feet by blasting; and it is really in the eye of a mineralogist a splendid object. I do not see that there is any prospect that it will soon be exhausted; although I doubt whether as fine specimens are now obtained from it as formerly."
Mineral List
22 entries listed. 17 valid minerals. 1 type locality (valid mineral). 1 erroneous literature entry.
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References
Gibbs, George. (1818). On the Tourmalines and Other Minerals Found at Chesterfield and Goshen, Massachusetts,
American Journal of Science, vol. 1, pp. 346-351.
Hitchcock, Edward (1833). Report on the Geology, Mineralogy, Botany, and Zoology of Massachusetts, pp. 505-506.
Shepard,Charles Upham (1835).
Microlite, a New Mineral Species,
American Journal of Science, v. 27, p. 361-362.
Emerson, B. K. (1917). The Geology of Massachusetts and Rhode Island (USGS Bulletin 597), pp. 255-256.
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