It has been observed that all the crystals of minerals and synthetic substances studied so far can be grouped, on the basis of A - Closed form, B - Open form symmetry, into 32 (Thirty two) classes. These are often called crystal classes. By definition, all crystals with an external form of the same symmetry make a crystal class. All [...]
In this article we will discuss about the optical and physical properties of minerals. Physical Properties of Minerals: 1. Colour: The colour of any object is a light dependent property- it is the appearance of the particular object in light (darkness destroys colour). A particular colour is produced by reflection of some and absorption of other components of white light. [...]
Only a few (not more than one hundred) minerals form the great bulk of the rocks of the crust of the Earth. These very common minerals have been grouped together as rock forming minerals. Even among these minerals, only about 25 or so make up almost 99.5 percent of the rocks one commonly comes across. As such, practical identification of [...]