… Garnet is not a single gemstone, but is made up of various garnets. Almandine, pyrope, and rhodolite, which is an intermediate component between the two, are red to purplish red or dark red, and symbolize truth, friendship, and faithfulness. They are used as the January birthstone. Spessartine is an orange-colored gemstone, but those with good transparency are used for gemstones. … 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(Mg 3 Cr 2 Si 3 O 12 ) and hydrogrossular (Ca 3 Al 2 Si 2 O 8 (SiO 4 ) 1~ m (OH) 4 m ) in which some of the Si has been replaced by 4(OH).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 "Almandine" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… ガーネットは単一宝石ではなく,各種のガーネット群によって形成されている。アルマンディンalmandine,パイロープpyrope,両者の中間的成分のロードライトrhodoliteの3種は赤色から帯紫赤色,暗赤色を示し,真実,友愛,忠実を象徴し,1月の誕生石に用いられる。スペサルティンspessartineは橙色系の色であるが,透明度の良いものが宝石用となる。… 【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。… ※「アルマンディン」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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