- trigonal dipyramidal class
- 三方双锥类, 三方复取晶体类
English-Chinese geology dictionary (英汉地质大词典). 2013.
trigonal dipyramidal class
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Crystal system — Diamond crystal structure consists of face centered cubic lattice. In crystallography, the terms crystal system, crystal family, and lattice system each refer to one of several classes of space groups, lattices, point groups, or crystals.… … Wikipedia
