出典:Wiktionary
出典:『Wiktionary』 (2026/01/04 23:49 UTC 版)
langbeinite (countable and uncountable, plural langbeinites)
出典:Wikipedia
出典:『Wikipedia』 (2011/05/28 05:52 UTC 版)
Langbeinite is a potassium magnesium sulfate mineral with formula: K2Mg2(SO4)3. Langbeinite crystallizes in the isometric - tetartoidal system as transparent colorless or white with pale tints of yellow to green and violet crystalline masses. It has a vitreous luster. The Mohs hardness is 3.5 to 4 and the specific gravity is 2.83. The crystals are phosphorescent and piezoelectric.