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单词 malacon
释义

malaconn.

Brit. /ˈmaləkən/, U.S. /ˈmæləˌkɑn/
Forms: 1800s malacone, 1800s– malacon.
Origin: A borrowing from German. Etymon: German Malakon.
Etymology: < German Malakon (T. Scheerer 1844, in Ann. der Physik 62 436) < ancient Greek μαλακόν , neuter of μαλακός soft (see malaco- comb. form).
Mineralogy.
A soft brown altered form of zircon.
ΘΚΠ
the world > the earth > minerals > types of mineral > silicates > nesosilicates > [noun] > zircon group > zircon
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1854 J. D. Dana Syst. Mineral. (ed. 4) 111. ii. 196 Malacone.
1868 J. D. Dana Syst. Mineral. (ed. 5) 275 The following tetragonal zircon-like minerals are probably altered zircon... Malacon.
1921 Mineral. Abstr. 1 173 The malacon of Madagascar shows a higher degree of radioactivity than is accounted for by its content of thorium.
1941 Amer. Jrnl. Sci. 239 306 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.
1968 I. Kostov Mineral. 11. v. 294 Malacon is a metamict zircon.
This entry has been updated (OED Third Edition, June 2000; most recently modified version published online March 2022).
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