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Monoclinic crystal An example of the monoclinic crystal orthoclase. In crystallography, the monoclinic crystal system is one of the seven crystal systems. A crystal system is described by three vectors. In the monoclinic system, the crystal is described by vectors of unequal lengths, as in the orthorhombic system. They form a parallelogram ...
Crystal systems that have space groups assigned to a common lattice system are combined into a crystal family. The seven crystal systems are triclinic, monoclinic, orthorhombic, tetragonal, trigonal, hexagonal, and cubic. Informally, two crystals are in the same crystal system if they have similar symmetries (though there are many exceptions).
Optical properties of common minerals Name Crystal system Indicatrix Optical sign Birefringence Color in plain polars Anorthite: Triclinic: Biaxial (-) 0.013
C. Cabalzarite; Cafetite; Calaverite; Campigliaite; Canavesite; Carlfriesite; Carnotite; Carpathite; Caryopilite; Castellaroite; Catapleiite; Celadonite; Celsian ...
Category: Minerals by crystal system. 25 languages. ... Trigonal minerals (21 C, 200 P, 2 F) This page was last edited on 30 September 2020, at 06:58 (UTC) ...
Media in category "Trigonal minerals" The following 2 files are in this category, out of 2 total. Cinnabar on Dolomite.jpg 1,763 × 1,254; 1.4 MB.
The hexagonal crystal family consists of two crystal systems: trigonal and hexagonal. A crystal system is a set of point groups in which the point groups themselves and their corresponding space groups are assigned to a lattice system (see table in Crystal system#Crystal classes).
Trigonal crystals (4 C, 2 P) Pages in category "Crystals" The following 97 pages are in this category, out of 97 total. This list may not reflect recent changes. ...