結けっ晶しょう軸じく

noun

crystal axis

Technical term in crystallography and mineralogy; refers to a reference line used to describe the symmetry and orientation of a crystal lattice.

• 結けっ晶しょう軸じくの方ほう向こうによって、鉱こう物ぶつの光こう学がく的てき性せい質しつが異ことなる。

  The optical properties of a mineral differ depending on the direction of the crystal axis.