• Webster's Revised Unabridged Dictionary
    • n Jeffersonite (Min) A variety of pyroxene of olive-green color passing into brown. It contains zinc.
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Century Dictionary and Cyclopedia
    • n jeffersonite A variety of pyroxene occurring in large crystals, often with uneven faces and rounded edges, and having a dark olive-green color passing into brown. It is peculiar in containing some zinc and manganese. It occurs, with frauklinite, zincite, etc., at Franklin Furnace, Sussex county, New Jersey.
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Chambers's Twentieth Century Dictionary
    • n Jeffersonite jef′er-son-īt a greenish-black variety of pyroxene.
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Webster's Revised Unabridged Dictionary
Named after Thomas Jefferson,
Chambers's Twentieth Century Dictionary
Thomas Jefferson, 1743-1826.


In literature:

Several indistinct varieties have been named, the most important of which is jeffersonite.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 3" by Various