Mesozoic amygdaloidal diabase dikes. Quarries are located in Westfield and West Springfield, along the town line.
References
Shannon, Earl V. (1919): Famous mineral localities. The
datolite locality near Westfield, Mass. (American Mineralogist 4:5)
Shannon, Earl V. (1920)
Diabantite,
stilpnomelane, and
chalcodite from Westfield (Proc. Unites States Nat. Mus. 57:397).
Gillson, Joseph L. (1926):
Pigeonite from the Triassic traps of the Connecticut Valley (American Mineralogist 11:317)
Palache, Charles (1936):
Babingtonite and
epidote from Westfield, Massachusetts (American Mineralogist 21:652-655)
White, John S. and Cook, Robert B. (1990).
Amethyst Occurrences of the Eastern United States.
Mineralogical Record 21:203-213.
Mineral List
16 entries listed. 12 valid minerals.
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