Tag «when a biaxial mineral is positive»

Biaxial minerals

Crystals belonging to orthorhombic, monoclinic, and triclinic systems have two optic axes and therefore they are called ”biaxial”. These optic axes intersect each other to form acute and obtuse angles. The acute angle between the two optic axes is called the ”optic axial angle” and is commonly designated as 2v. The plane containing the two …