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titanite
Titanite, or sphene (from the Greek ''sphenos'' (σφηνώ), meaning wedge〔), is a calcium titanium nesosilicate mineral, CaTiSiO5. Trace impurities of iron and aluminium are typically present. Also commonly present are rare earth metals including cerium and yttrium; calcium may be partly replaced by thorium.〔Deer, Howie & Zussman, (1966) , pp17-20 : 'Introduction to the Rock-Forming Minerals', 1966, ISBN 0-582-44210-9〕
==Nomenclature==
The International Mineralogical Association Commission on New Minerals and Mineral Names (CNMMN) adopted the name titanite and 'discredited' the name sphene as of 1982, although commonly papers and books initially identify the mineral using both names. Sphene was the most commonly used name until the IMA decision, although both were well known.〔 Some authorities think it is less confusing as the word is used to describe any chemical or crystal with oxidized titanium such as the rare earth titanate pyrochlores series and many of the minerals with the perovskite structure. The name sphene continues to be publishable in peer-reviewed scientific literature, e.g. a paper by Hayden et al. was published in early 2008 in the journal Contributions to Mineralogy and Petrology.〔 Sphene persists as the informal name for titanite gemstones.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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