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 […]
Crystals: Classes and Systems | Minerals | Geology
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Twinning in Crystals: Meaning, Types and Laws | Rocks | Geology
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In this article we will discuss about:- 1. Meaning of Twinning in Crystals 2. Some Illustrations of Twinning in Crystals 3. Types 4. Laws. Meaning of Twinning in Crystals: Generally crystals grow from the melts as individual specimens, each having its own shape, form and crystallographic characteristic. Sometimes, however, two crystals of the same compound […]
Crystals: Meaning, Elements and Symmetry | Rocks | Geology
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In this article we will discuss about:- 1. Meaning of a Crystal 2. Elements of a Crystal 3. Crystallographic Axes 4. Parameters, Indices, Symbols 5. Forms. Meaning of a Crystal: A crystal may be defined as a solid polyhedral form of a substance bounded by smooth geometrical surfaces called faces. Crystals may be natural or […]