boart是什么意思

n.=bort

1. The boart is a lower quality diamond compared to gem-quality diamonds.
(与宝石级钻石相比，下部产状的钻石质量较低。)

2. The drilling bit is designed to handle tough rock formations, including boart.
(钻井钻头的设计可以处理坚硬的岩石，包括下部产状。)

1. 钻石的下部产状，组织混杂， 常见于岩心。2. 刺入矿物中、弯曲而没有渐近准线的钻井钻头。