出典:Wiktionary
出典:『Wiktionary』 (2025/12/21 17:57 UTC 版)
From pyro- + Ancient Greek λοῦσις (loûsis) + -ite.
pyrolusite (countable and uncountable, plural pyrolusites)
出典:Wikipedia
出典:『Wikipedia』 (2011/06/14 12:22 UTC 版)
Pyrolusite is a mineral consisting essentially of manganese dioxide (MnO2) and is important as an ore of manganese. It is a black, amorphous appearing mineral, often with a granular, fibrous or columnar structure, sometimes forming reniform crusts. It has a metallic luster, a black or bluish-black streak, and readily soils the fingers. The specific gravity is about 4.8. Its name is from the Greek for fire and to wash, in reference to its use as a way to remove tints from glass.