| 释义 |
malacon Min.|ˈmæləkən|
Also † malacone.
[ad. G. malakon (T. Scheerer 1844, in Ann. d. Physik LXII. 436), f. Gr. µαλακόν, neut. of µαλακός soft.]
A soft brown altered form of zircon.
1854Dana Syst. Min. (ed. 4) 111. ii. 196 Malacone. 1868Ibid. (ed. 5) 275 The following tetragonal zircon-like minerals are probably altered zircon... Malacon. 1921Mineral. Abstr. I. 173 The malacon of Madagascar shows a higher degree of radioactivity than is accounted for by its content of thorium. 1941Amer. Jrnl. Sci. CCXXXIX. 306 The third type of [zircon] is characteristic of the younger granite in the Oxford House Area, and of the late pre-Huronian and Huronian granites of the Lake Superior region. This variety is malacon, a form of zircon with relatively low refringence, weak birefringence and a dirty, altered appearance. 1968I. Kostov Mineral. 11. v. 294 Malacon is a metamict zircon. |