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n.1.(Min.) A borate of iron and magnesia, occurring in fibrous masses of a blackish green color.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
apatite, aquamarine, ashanite, bimushite, bismutomicrolite, chrysoberyl, *cygrayite, epidote, ertixiite, fluorite, garnet, hiddenite, holmquistite, ilmenite, ishikawaite, manganotantalite, manganocolumbite, molybdenite, muscovite, phenakite, pollucite, polylithionite, pyrite, *qingheite, samarskite, scheelite, sphalerite, spodumene, staurolite, topaz, tourmaline, trilithionite, uraninite, zircon Labashan Hubei turquoise Laiyuan Hebei hematite, ludwigite Lamo Guangxi, apatite, galena, pyrite, quartz, Zhuang A.R.
Enterprises ( showed me several very sharp, long-prismatic gemmy crystals, to 4 cm, displaying inclusions of long, black, hairlike crystals of ludwigite and vonsenite (verified as such by John Koivala), running vertically in horsetail formations from base to tip.
Other less attractive but interesting species include bismuth minerals (native bismuth, bismuthinite, cosalite, bismutite), tungsten minerals (scheelite, ferberite) and several borates including ludwigite in large, radiated masses, inderite, szaibelyite and canavesite-a species described in 1978 for which Brosso is the type and, so far, only locality.
An example of one or the other of these latter two sources of error is the ludwigite supposedly from the Leonard mine, which was marketed by a number of mineral dealers in the 1980's.