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单词 polianite
释义

polianiten.

Brit. /ˈpəʊlɪənʌɪt/, U.S. /ˈpoʊliəˌnaɪt/
Origin: A borrowing from German. Etymon: German Polianit.
Etymology: < German Polianit (A. Breithaupt 1844, in Ann. der Physik 61 191) < ancient Greek πολιά greyness ( < πολιός grey: see poliosis n.) + German -it -ite suffix1, so called on account of its colour.
Mineralogy.
A mineral containing manganese, formerly regarded as a variety of pyrolusite but now generally regarded as identical with it.
ΘΚΠ
the world > the earth > minerals > types of mineral > oxides and hydroxides > [noun] > rutile and uranite groups A02 > manganese dioxide
brownstone1657
manganese1662
magnesia1677
soap of glass1815
pyrolusite1828
varvicite1829
polianite1849
manganese dioxide1866
pelagite1876
manganese oxide1882
1849 J. Nicol Man. Mineral. 420 Polianite..acts like pure hyperoxide of manganese.
1892 E. S. Dana J. D. Dana's Syst. Mineral. (ed. 6) 236 Polianite..is distinguished from pyrolusite..by its hardness and its anhydrous character.
1923 Physical Rev. 21 389 The [X-ray] pattern of pyrolusite agrees line for line with polianite.
1937 Mineral. Mag. 24 521 The present study had for its main objective an attempt to settle..the uncertainty existing as to the relationship between polianite and pyrolusite.
2000 Geol. Surv. India Special Publ. No. 57. 260 Epigenetic replacement and supergene activity were responsible for the formation of supergene minerals like pyrolusite,..polianite, lithiophorite and bimessite.
This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022).
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n.1849
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