This term refers to the particularity of a mineral belonging to a crystalline system other than cubic (usually the tetragonal system) of possessing crystalline parameters that bring it closer to a cubic system or that form crystals close to the shape of the cube (pseudocubic quartz).
Pseudocubic quartz with angle of 85.76° (rare)
Pégut pseudocubic quartz type with angle of 85.76°
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