21. Political scientists use a variety of biaxial and multiaxial systems to more accurately characterize political opinion. 22. Biaxial orientation increases strength and clarity.23. He designed and installed a novel biaxial universal testing machine based on a 200 kN frame. 24. Sarabauite is a biaxial negative mineral. 25. The main difference between biaxial and axial crystals is that biaxial crystals have two optic axes. 26. The main difference between biaxial and axial crystals is that biaxial crystals have two optic axes. 27. The optical class is biaxial and the refractive indices are approximately equal to 1.90. 28. Triclinic, monoclinic and orthorhombic crystals have two optic axes, and are said to be biaxial . 29. Crystals are classified according to the number of optic axes ( uniaxial, biaxial ) they have. 30. Hagendorfite belongs to the monoclinic crystal class, so it is assigned to the biaxial optical class.
