Less perfect forms , known as " boart " and " carbonado ", are clusters of tiny crystals .
稍次些的则由细小的晶体群组成，称为“圆粒钻石”和“黑钻石”。
Boart Longyear said up to200 jobs had been shed in Australia and there could be more to come .
博特朗耶尔说，多达200个工作岗位已在澳大利亚和下跌可能有更多的惊喜。
boart