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单词 pentahydrocalcite
释义

pentahydrocalciten.

Brit. /ˌpɛntəhʌɪdrə(ʊ)ˈkalsʌɪt/, U.S. /ˈˌpɛn(t)əˌhaɪdroʊˈkælˌsaɪt/
Origin: Formed within English, by compounding; modelled on a Russian lexical item. Etymons: penta- comb. form, hydro- comb. form, calcite n.
Etymology: < penta- comb. form + hydro- comb. form + calcite n., after Russian pentagidrokal′cit (P. N. Čirvinskij 1906, in Ežegodnik po Geol. i Mineral. Rossii 8 241). Compare earlier hydrocalcite n. at hydro- comb. form 7.
Mineralogy.
A mineral supposedly consisting of a pentahydrated form of calcium carbonate, CaCO3·5H2O, the natural occurrence of which is uncertain.
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the world > the earth > minerals > types of mineral > carbonates > [noun] > hydrated calcium carbonate
pentahydrocalcite1910
trihydrocalcite1910
scawtite1929
1910 Mineral. Mag. 15 427 Pentahydrocalcite..Hydrated calcium carbonate, CaCO3·5H2O, occurring as a mould-like encrustation on chalk-marl near Nova-Alexandria, govt. Lublin, Russian Poland.
1928 Ann. Rep. Progr. Chem. 24 308 The minerals hydroconite, hydrocalcite (trihydrocalcite, pentahydrocalcite), and lublinite periodically come to be regarded as doubtful minerals, because when re-examined on museum material they are found to be merely calcite.
1957 G. E. Hutchinson Treat. Limnol. I. x. 660 The deposition of hydrates, supposedly CaCO3·3H2O, trihydrocalcite, and CaCO3·5H2O, pentahydrocalcite, in nature has been recorded.
1968 I. Kostov Mineral. 531 Trihydrocalcite..and pentahydrocalcite..are unstable and easily change into calcite.
This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022).
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n.1910
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