…Among andradites, the bright green demantoid is rare and highly prized. There are very few gemstones of uvarovite. For the mineral properties of garnets, see the entry on garnet. … From [Garnet (Pomegranate)]...It is one of the important rock-forming minerals, belongs to the cubic crystal system, and is a general term for a group of minerals belonging to the garnet group with the chemical composition R II 3 R III 2 Si 3 O 12 (where R II is Ca, Mg, Fe 2+ , Mn, and R III is Al, Fe 3+ , Cr, etc.). The end members are pyrope (Mg 3 Al 2 Si 3 O 12 ) , almandine (Fe 3 Al 2 Si 3 O 12 ) , spessartine (Mn 3 Al 2 Si 3 O 12 ) , grossular (Ca 3 Al 2 Si 3 O 12 ) , andradite (Ca 3 Fe 2 Si 3 O 12 ) , uvarovite (Ca 3 Cr 2 Si 3 O 12 ) , knorringite (Mg 3 Cr 2 Si 3 O 12 ) and hydrogrossular (Ca 3 Al 2 Si 2 O 8 (SiO 4 ) 1~ m (OH) 4 m ) in which some of the Si has been replaced by 4(OH). Andradite with a high Ti content is called melanite. … *Some of the terminology explanations that mention "Uvarovite" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…アンドラダイトandraditeのうちで,鮮やかな緑色のデマントイドdemantoidは希少価値があり,とくに珍重される。ウバロバイトuvaroviteには宝石種のものはほとんどない。なお,ガーネットの鉱物的性質については〈ザクロ石〉の項を参照されたい。… 【ザクロ石(柘榴石)】より…重要な造岩鉱物の一つであり,立方晶系に属し,化学組成はRII3RIII2Si3O12(ここでRIIはCa,Mg,Fe2+,Mn,RIIIはAl,Fe3+,Crなど)で表されるザクロ石族に属する一群の鉱物の総称である。端成分はパイロープMg3Al2Si3O12,アルマンディンalmandine Fe3Al2Si3O12,スペサルティンspessartine Mn3Al2Si3O12,グロッシュラーgrossular Ca3Al2Si3O12,アンドラダイトandradite Ca3Fe2Si3O12,ウバロバイトuvarovite Ca3Cr2Si3O12,ノーリンジャイトknorringite Mg3Cr2Si3O12とSiの一部を4(OH)が置換したハイドログロッシュラーhydrogrossular Ca3Al2Si2O8(SiO4)1~m(OH)4mである。またTiの多いアンドラダイトはメラナイトmelaniteと呼ばれている。… ※「ウバロバイト」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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