Min. [Named 1822, after President Jefferson: see prec. and -ITE.] A greenish-black variety of pyroxene, containing some zinc and manganese.
1822. Amer. Jrnl. Sc., V. 402. Jeffersonite … has a great resemblance to pyroxene.
1852. Shepard, Min., 199. Jeffersonite … abounds in iron and manganese.
