The sample from the meteorite was far too small to test for hardness, except to show that it is certainly harder than regular diamonds.
如果要检测硬度，陨石的标本就太小，它只能显示出这种物质无疑比一般钻石硬。
Hardness than corundum, abrasive easily broken, sharp edges and corners, good cutting, grinding heat and small.
硬度高于棕刚玉，磨粒易破碎，棱角锋利，切削性能好，磨削热量小等。
The clamping claw with high hardness, and intermittent cutting, so that when the cutting depth and cutting amount is small, the cutting speed is not too high.
因卡爪硬度较高，又系断续切削，所以修正时切削深度和走刀量要小，切削速度也不宜太高。
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