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peridot : ウィキペディア英語版
peridot

Peridot ( or ) is gem-quality olivine. Olivine is a silicate mineral with the formula of (Mg, Fe)2SiO4. As peridot is the magnesium-rich variety (forsterite) the formula approaches Mg2SiO4.
==Etymology==
The origin of the name ''peridot'' is uncertain. The ''Oxford English Dictionary'' suggests an alteration of AngloNorman ''pedoretés'' (classical Latin ''pæderot''-), a kind of opal, rather than the Arabic word ''faridat'', meaning "gem".
The Middle English Dictionary's entry on ''peridot'' includes several variations : ''peridod'', ''peritot'', ''pelidod'' and ''pilidod'' – other variants substitute ''y'' for the ''is seen here.
The earliest use in England is in the register of the St Albans Abbey, in Latin, and its translation in 1705 is possibly the first use of "peridot" in English. It records that on his death in 1245 Bishop John bequeathed various items including peridot to the Abbey.

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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