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Psilomelane
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==Characteristics== Psilomelane has no definite [[chemical composition]] and occurs as [[botryoidal]] and [[Speleothem|stalactitic]] masses with a smooth shining surface and submetallic lustre. The [[mineral]] is readily distinguished from other hydrous manganese oxides ([[manganite]] and [[Wad (mineral)|wad]]) by its greater [[Mohs scale of mineral hardness|hardness]] 5 to 6; the [[specific gravity]] varies from 3.7 to 4.7. The streak is brownish black and the fracture smooth. The mineral often contains admixed impurities, such as [[iron hydroxide]]s. It is soluble in [[hydrochloric acid]] with evolution of [[chlorine]] gas.
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