From Wikipedia, the free encyclopedia
Romboedr (romb va yun. hedra — asos, yon, tomon) — hamma yokdari teng romblar boʻlgan parallelepiped. Baʼzi kristallarning, Mas, island shpatining kristallari R. shaklida boʻladi. Parallelepiped faqat uchinchi tartibli simmetriya oʻqiga ega boʻlgandagina R. boʻladi.[1]
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