Touramaline has many varieties in the nature,and a majority of powder of them is black or cinerous,so their application in the fields where need colour requirements is affected.
自然界产出
电气石品种很多，大部分粉末是黑
或灰，在一些需
求领域
到较大影响。
,灰烬Touramaline has many varieties in the nature,and a majority of powder of them is black or cinerous,so their application in the fields where need colour requirements is affected.
自然界产出电气石品种很多，大部分粉末是黑或灰，在一些需求领域到较大影响。
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