by Gelogia | Oct 30, 2024 | Mineralogy, Structural Geology
Lineation: Lineation is expressed by the parallelism of some directional property in the rock. Types of lineation: Lineation is found to develop in igneous, sedimentary, and metamorphic rocks. Lineation is of two types: primary lineation (sedimentary rocks, igneous...
by Gelogia | Oct 14, 2024 | Mineralogy
Silicates: Silicates are compounds containing silicon as an anion. The most common silicates are oxides, but hexafluoro silicates and other anions are also included. Silicate minerals contain (SiO4)4- in their structure. Silicates form the largest class of mineral...
by Gelogia | Oct 9, 2024 | Crystallography & Mineral Optics, Mineralogy
Crystal twinning is the symmetrical intergrowth of two or more crystals, related by a symmetry operation known as a twin element. Twin elements can include mirror planes, rotation axes (typically two-fold), and rotation inversion, which are distinct from the natural...
by Gelogia | Oct 7, 2024 | Crystallography & Mineral Optics, Mineralogy
Crystal symmetry refers to the regular arrangement of faces, edges, and other structural features in a crystal. This regularity constitutes the crystal’s symmetry. The degree of symmetry varies in different minerals and is employed in the classification of...
by Gelogia | Oct 6, 2024 | Crystallography & Mineral Optics, Mineralogy
A Crystal system includes all the symmetry classes that share a similar constant of lattice parallelepiped. The classes are grouped into six crystal systems based on the absence or presence of certain types of rotation axes. Also, we can say that the basis of...
by Gelogia | Feb 16, 2022 | Mineralogy, Petrology, Structural Geology
The study of rock deformation needs knowledge of the physical properties of rock about deformation. These properties are concerned either with elastic or with plastic deformation or with rupture. Table of Content Elastic propertiesPlastic propertiesRuptureBrittle...
