The coesite mainly changed quartz glomerocryst which made its including minerals creat radial cracks;
柯石英多已转化为石英聚晶，并使包裹它的矿物产生放射状胀裂纹；
2
The successful application of PCD, PCBN glomerocryst materials in automotive manufacturing field are presented for the improvement of domestic superhard machining technology.