31. Optically, donnayite is biaxial negative with a 2v ( measured ) ranging from 0R -30R . 32. Two-dimensional elements with a thin third dimension have little of either but can resist biaxial traction. 33. Interference figures yield addition on the concave side of the isogyers, causing ulexite to be biaxial positive. 34. For this reason, birefringent materials with three distinct refractive indices are called " biaxial ". 35. Viewing the interference figure is a foolproof way to determine if a mineral is optically uniaxial or biaxial . 36. Since it is orthorhombic, marthozite is biaxial , meaning that it has three different indices of refraction. 37. A surprising system of intersecting Cherenkov rings in a biaxial crystal at precisely defined particle energies was predicted. 38. It was a major modification of the BA-20, using a triaxial truck chassis instead of biaxial . 39. The representation of this phenomenon becomes rather complex due to the biaxial and internal pressure load and structural configuration. 40. Steatite ceramics are low-cost biaxial porcelains of nominal composition ( MgO ) 3 ( SiO 2 ) 4.
