noun
tetragonal crystal system
Technical term in geology and crystallography for a crystal system with three axes at right angles, two of equal length.
正方晶系に属する鉱物の例として、ジルコンが挙げられる。
Zircon is an example of a mineral belonging to the tetragonal crystal system.
Compound of 正方 (square, regular) + 晶系 (crystal system). The term is a direct calque from Western crystallographic terminology.