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

The 7 crystal systems consist of 32 crystal classes (corresponding to the 32 crystallographic point groups) as shown in the ...

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,  ...

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. ... In a first step one divides the Bravais lattices into 7 crystal systems which are ...

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

For example, the crystal classes which occur within the trigonal crystal system are the trigonal monohedral and trigonal ...

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

The seven crystal systems are a method of classifying crystals according to their atomic lattice or structure. The atomic ... Crystal forms are usually paired faces.

http://www.mineralogy4kids.org/?q=all-about-crystals/crystal-systems

Crystal Systems. Different crystals have different shapes and forms because of the: stacking of the unit cells. internal arrangement of the atoms. the environment  ...

https://chem.libretexts.org/Bookshelves/General_Chemistry/Book%3A_ChemPRIME_(Moore_et_al.)/10Solids%2C_Liquids_and_Solutions/10.03%3A_Crystal_Systems

Apr 27, 2019 ... Crystals are made up of many unit cells arranged in a repeating pattern. Here you can learn about the different forms the unit cell of a crystal ...

https://www.periodni.com/crystal-systems-and-bravais-lattices.html

Crystal system is a method of classifying crystalline substances on the basis of their unit cell. There are seven unique crystal systems. The simplest and most ...

http://reference.iucr.org/dictionary/Crystal_system

Nov 29, 2017 ... A crystal-class system, or crystal system for short, contains complete geometric crystal classes of space groups. All those geometric crystal ...