这些晶体只有在地球深处的集中压力下才能形成，必然是以不可思议的速度喷发，在通往地球表面的过程中完好无损地幸存下来。
These crystals, which can form only under the intense pressure of the Earth's deep interior, must have been erupted at unbelievable speed to have survived the journey to the surface intact.
国际矿物宝石收藏界普遍认为，瑶岗仙出产的带有基岩的车轮矿标本，完好无损、晶体硕大、色泽柔美，是难得一见的珍品。
It is generally recognized in the international mineral gemstone collectors, bournonite specimens of Yaogangxian produced with bedrock, intact, crystal large, gentle color, are rare treasures.
采用化学共沉淀法，通过加入分散剂，制备了团聚程度低、结晶度完好、具有较好磁性能、不同组成的锰锌铁氧体粉末晶体。
The homogeneous low-agglomerated and well crystallined MnZn ferrite powder with good magnetic properties were prepared by coprecipitation method and adding dispersant.
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