allopalladiumn.
/ˌaləpəˈleɪdɪəm/, U.S. /ˌæləpəˈleɪdiəm/ Mineralogy. Now rare.
A silver-grey mineral containing palladium and other elements, originally thought to be an impure allotrope of palladium and now identified with stibiopalladinite.
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allopalladium1868
1868 J. D. Dana Syst. Mineral. (ed. 5) 12 Allopalladium..Palladium, under the hexagonal system, the metal being dimorphous... From Tilkerode, in the Harz, in small hexagonal tables with gold.
1902 Bull. U.S. Geol. Surv. No. 193. 66 The allopalladium occurs as microscopic six-sided scales on the gold of the Eskeborner shaft.
1969 J. B. Mertie Econ. Geol. Platinum Metals 14/1 Cooperite, braggite, laurite, potarite, allopalladium, palladinite, stibiopalladinite, and niggliite are little known platinum minerals.
This entry has been updated (OED Third Edition, September 2012; most recently modified version published online March 2022).
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n.1868