noun
pickeringite
A rare magnesium aluminum sulfate mineral. Technical term used in mineralogy and geology.
苦土明礬は、マグネシウムを含む硫酸塩鉱物の一種である。
Pickeringite is a type of sulfate mineral containing magnesium.
The Japanese name 苦土明礬 is composed of 苦土 (magnesia) and 明礬 (alum), reflecting its chemical composition as a magnesium alum. The exact historical derivation is uncertain.