noun
sylvite; sylvine
A potassium chloride mineral, often found in evaporite deposits. Technical term used in geology and mineralogy.
カリ岩塩はカリウムの重要な鉱石です。
Sylvite is an important ore of potassium.
岩塩 is rock salt (halite, NaCl), while カリ岩塩 is sylvite (KCl), a different mineral.
Compound of カリ (from German 'Kali', potash) and 岩塩 (rock salt).