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 […]
Crystals: Meaning, Elements and Symmetry | Rocks | 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 […]
List of Rock Forming Minerals | Geology
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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. […]