Montebrasite and Prehnite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Montebrasite and Prehnite Physical Properties like crystallographic symmetry, pleochroism,etc. in the crystal. Some of the optical properties are refractive index, luster, optic character, pleochroism etc. Prominent among these is Montebrasite and Prehnite optic character. You might have noticed your gemologist rotating the gemstone while testing it. Rotating a gemstone along its optic axis helps in determining its optic character.
Similar to their colors, Montebrasite and Prehnite transparency can also be used as criteria for their primary identification. Although transparency cannot be the only criteria for gemstone identification, it can efficiently used in gemstone grading. Talking about their transparency, Montebrasite is TransparentWalter Schumann and Gemstones of the world (2001) More from other references while Montebrasite is TransparentWalter Schumann and Gemstones of the world (2001) More from other references in appearance.