An end component of garnet solid solution. Mg 3 Al 2 Si 3 O 12 . A cubic crystal mineral. Hardness 7.5, specific gravity 3.535. It is pink-red, but when some of the magnesium is replaced by iron, it turns purple-red. Blood-red pyrope is used as a gemstone. Pure pyrope does not exist in nature, but forms a solid solution with iron-aluminum garnet. It is also called magnesium garnet. It is stable above 100°C unless it is under high pressure of more than 7000 atmospheres. It is found in garnet olivine and eclogite. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
柘榴石固溶体の端成分。 Mg3Al2Si3O12 。立方晶系の鉱物。硬度 7.5,比重 3.535。桃赤色であるが,マグネシウムの一部が鉄に置換されると紫赤色になる。血赤色のものは宝石になる。天然のものには純粋なパイロープはなく,鉄礬 (てつばん) 柘榴石と固溶体をなしている。苦礬柘榴石ともいう。 100℃以上では 7000気圧以上の高圧下でなければ安定に存在しない。柘榴石橄欖岩やエクロジャイトに産する。
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