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
电气石品种很多，大部分粉末是黑色或灰色，在一些需要色泽要求领域应用受到较大影响。
,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.
自然电气石品种很多，大部分粉末是黑色或灰色，在一些需要色泽要求领域应用受到较大影响。
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