Distinguishing feature: the relative density of barite (D = 4.3 - 4.5) is its outstanding feature, so it can be distinguished from other similar minerals. In the chip, barite and celestite is very similar, but the axis of barite angle is smaller, the interference color is slightly higher. The difference between barite and anhydrite is that the refractive index of barite is large, while the birefringence is much lower than that of anhydrite.
Optical properties: white, gray, hands were yellow, light green, light blue, reddish brown color. Colorless, transparent, sometimes weakly colored in flakes. Median projection with interference yellow or orange. Parallel extinction, positive ductility. The refractive index increases with the increase of Pb content and decreases slightly with the increase of Sr content.
Do not understand, you can ask the teacher, so that both can solve the problem, but also to promote friendship between teachers and students, do not wait until graduation, want to find a teacher chat, there is no cordial feeling.
