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,大部分粉末是黑色或灰色,在一色泽求领域应用大影响。
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.
自然界产出电气石品种很多,大部分粉末是黑色或灰色,在一色泽求领域应用大影响。
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