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.
自然界产出的电气石品种很多，大部分粉末是黑色或灰色的，在一些需要色泽要求的领域应用受到较大的影响。
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.
自然界产出的电气石品种很多，大部分粉末是黑色或灰色的，在一些需要色泽要求的领域应用受到较大的影响。
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