wurtzite

1.Only small amounts of wurtzite boron nitride and lonsdaleite exist naturally or have been made in the lab so until now no one had realised their superior strength.

天然存在或者实验室制造的纤锌矿硼和朗斯代尔石数量很少，直到现在，也没有一个发现它们令吃惊的硬度。