noun
pyrope
A deep red variety of garnet, used as a gemstone. Technical term in mineralogy.
苦礬柘榴石は、マグネシウムを含む紅色の柘榴石です。
Pyrope is a magnesium-rich red garnet.
柘榴石 is the general term for garnet, while 苦礬柘榴石 specifically refers to the pyrope variety.
The kanji 苦礬柘榴石 is a direct translation of the mineral name: 苦 (bitter) refers to magnesium (苦土), 礬 (alum) indicates a sulfate mineral, and 柘榴石 means garnet. The reading くばんざくろいし follows the on'yomi of the characters.