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单词 Povondraite
释义

Povondraite

英语百科

Povondraite

Povondraite is a rare silicate mineral from the tourmaline group with formula: NaFe3(Fe4,Mg2)(BO3)3Si6O18(OH)3O. It is a dark brown to black nearly opaque mineral with a resinous to splendent luster. It crystallizes in the trigonal crystal system as equant, distorted prisms with trigonal pyramid terminations.

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更新时间:2025/6/20 17:02:52