a parallelepiped bounded by six similar faces (either rhombuses or parallelograms)
例句
Quartz is commonly found as a six-sided, prism-shaped crystal topped by pyramid-like form, while calcite usually shows a crystal form of rhombohedron. 石英通常呈六方柱，顶上带有双锥的晶形，而方解石却常以菱形六面体形式出现。
Under a suitable condition of crystallization, dark brown short rhombohedron crystals could be obtained from nitrogenase MnFe protein purified from a mutant UW 3 of Azotobacter vinelandii Lipmann grown in Mn_containing but Mo_ and NH 3_free medium. 从以Mn代钼的固氮培养基中固氮生长的固氮菌 (AzotobactervinelandiiLipmann)突变种UW3 中分离纯化的MnFe蛋白 ,在一定的结晶条件下 ,可从溶液中析出深棕色的短斜四棱柱晶体。
Keywords rock mass;main structural planes;rhombohedron; 岩体;主结构面;菱形六面体;
Keywords formation mechanism of particles;morphology and size control;nickel and cobalt oxalates;rhombohedron and fibre morphologies; 颗粒形成机理;形貌与粒度控制;镍钴草酸盐;菱柱状与纤维状形貌;
79. Quartz is commonly found as a six-sided, prism-shaped crystal topped by pyramid-like form, while calcite usually shows a crystal form of rhombohedron. 石英通常呈六方柱，顶上带有双锥的晶形，而方解石却常以菱形六面体形式出现。
