https://en.wikipedia.org/wiki/Crystal_system

In crystallography, the terms crystal system, crystal family, and lattice system each refer to one ... The six crystal families are formed by combining the hexagonal and trigonal ..... Overview of the 32 groups · Mineral galleries – Symmetry · all cubic crystal classes, forms, and stereographic projections (interactive java applet) ...

http://www.geo.utexas.edu/courses/347k/redesign/PDF_Handouts/cells.pdf

THE SIX CRYSTAL SYSTEMS. ISOMETRIC. (CUBIC). TETRAGONAL. HEXAGONAL. ORTHORHOMBIC. MONOCLINIC. TRICLINIC a2 a3 a1 a2 c a1 a3 c a1 a2.

http://www.chem.wisc.edu/~danny/interactive/systems/

The structures of all crystals can be classified according to the symmetry of the unit cells. There are in total 7 groups, collectively called Crystal Systems: Tricinic,  ...

http://www.geologyin.com/2014/11/crystal-structure-and-crystal-system.html

Nov 13, 2014 ... By considering what type of symmetry a mineral species possesses, the species may be categorized as a member of one of six crystal systems ...

https://www.mpp.mpg.de/~bangert/Mineralogy/crystal.html

By considering what type of symmetry a mineral species possesses, the species may be categorized as a member of one of six crystal systems and one of ...

https://www.thoughtco.com/types-of-crystals-602156

Sep 8, 2018 ... There is more than one way to categorize a crystal, Learn here about the shapes and structures of the different types of crystals. ... Trigonal: These crystals possess a single 3-fold axis of rotation instead of the 6-fold axis of the ...

https://www.physics-in-a-nutshell.com/article/6/symmetry-crystal-systems-and-bravais-lattices

However, there are some lattices types that occur particularly often in nature. ... Therefore it is helpful to classify crystal structures according to its symmetry.

https://www3.nd.edu/~amoukasi/CBE30361/Lecture__crystallography_A.pdf

Crystal Structure: Basic Definitions - lecture. • Calculation of material .... a1 a2 a3 . . . In general this system involves 6 classes of symmetries and 15 crystal forms ...

https://www.gemsociety.org/article/mineral-habits/

When sulfur forms into crystals, it forms in the orthorhombic system, just like ... There are six crystal systems or ways that crystals form within specific minerals. ... Minerals that form in the isometric system form in one of these three basic shapes .

https://www.crystalage.com/crystal_information/seven_crystal_systems/

For example crystals in the Cubic System are believed to be grounding, because the cube is a symbol of the element Earth. ... Here we have outlined the basic atomic structure of the seven systems, along with some ... In the cross-section of a Hexagonal crystal, there will be six sides. ... Crystal forms are usually paired faces.