Birnessite

Birnessite (Na_0.3Ca_0.1K_0.1)(Mn,Mn)₂O₄ · 1.5 H₂O is an oxide mineral of manganese along with calcium, potassium and sodium. It has a dark brown to black color with a submetallic luster. It is also very soft, with a Mohs hardness of 1.5. Birnessite is formed by precipitation in lakes, oceans and groundwater and is a major component of desert varnish and deep sea manganese nodules.

单词	Birnessite
释义	Birnessite 原声例句经济学人（汇总） Like metal-organic frameworks, birnessite is riddled with tiny holes that allow air to move around inside it, to maximise adsorption. 和金属-有机骨架一样，水钠锰矿布满了小孔，空气可以在里面流动，最大限度地吸附。英语百科 Birnessite Birnessite (Na_0.3Ca_0.1K_0.1)(Mn,Mn)₂O₄ · 1.5 H₂O is an oxide mineral of manganese along with calcium, potassium and sodium. It has a dark brown to black color with a submetallic luster. It is also very soft, with a Mohs hardness of 1.5. Birnessite is formed by precipitation in lakes, oceans and groundwater and is a major component of desert varnish and deep sea manganese nodules.
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