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Pyrolusite
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<p>Pyrolusite is a <a href="/facts/Mineral/LkUFbNmv">mineral</a> consisting essentially of <a href="/facts/Manganese_dioxide/HRwgXlUe">manganese dioxide</a> (<a href="/facts/Manganese/j9ELd1TL">Mn</a><a href="/facts/Oxygen/acyn6o8r">O</a>2) and is important as an <a href="/facts/Ore/kgc9DssX">ore</a> of manganese. It is a black, <a href="/facts/Amorphous/YTIzmrR0">amorphous</a> appearing mineral, often with a granular, fibrous, or columnar structure, sometimes forming reniform crusts. It has a metallic <a href="/facts/Lustre_(mineralogy)/TCobwMGC">luster</a>, a black or bluish-black streak, and readily soils the fingers. The <a href="/facts/Specific_gravity/ySquGd2x">specific gravity</a> is about 4.8. Its name is from the Greek for <i>fire</i> and to <i>wash</i>, in reference to its use as a way to remove tints from glass. </p>