pyralspite

…Most natural garnets are thought to be complex solid solutions of the first six end members. The first three components form a continuous solid solution series, which is sometimes called pyralspites, and the next two components also form a continuous solid solution series, which is sometimes called grandites. These two series do not form a complete solid solution with each other, and their occurrences are completely different. They occur as chunks or granules, but often show beautiful euhedral shapes with well-developed {110} and {211} shapes (rhombic dodecahedrons, rhombohedrons, and their aggregates). …

*Some of the terminology explanations that mention "pyralspite" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…天然のザクロ石の多くは最初の6端成分の複雑な固溶体と考えられている。はじめの3成分は連続固溶体系列をつくり，これをパイラルスパイトpyralspite，次の2成分も連続固溶体系列をつくりグランダイトgranditeと呼ぶことがあり，この2系列は互いに完全な固溶体をつくらず，産状がまったく異なっている。塊状，粒状として産出するが，｛110｝や｛211｝の発達した美しい自形(斜方十二面体，偏菱三十八面体とそれらの集形)を示すことも多い。…

※「pyralspite」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