troostite
(ˈtruːstaɪt)
[Named after Prof. G. Troost of Nashville, Tennessee: see -ite1.]
1. Min. A variety of willemite, with admixture of iron and manganese, occurring in reddish hexagonal crystals.
| 1835 C. U. Shepard Treat. Min. II. 247 Troostite..is found at Sterling (N.J.) associated with Franklinite. 1850 Ansted Elem. Geol., Min. etc. §448 Troostite, or Troolite, is a variety [of Bi-silicate of Manganese] containing iron. 1868 Dana Min. (ed. 5) 262 Willemite..Silicate of Zinc... The crystals of..New Jersey are often quite large, and pass under the name of troostite. |
2. Metallurgy. A transitional constituent of steel: cf. martensite, pearlite 2, sorbite2.
| 1902 Encycl. Brit. XXIX. 572/2 Austenite, troostite, sorbite, and other constituents [of iron] have also been described. |
Hence troostitic (-ˈɪtɪk) a., pertaining to or consisting of troostite (Cent. Dict. Suppl. 1909).