Tetragonal System
A crystal system which consists of three axes, two of equal length and perpendicular to one another, the third perpendicular to the plane of the others.
Part 4: The Tetragonal System
So you didn't get enough punishment in Article 3 and are back for more. Don't say we didn't warn you that thinking about all this crystallography stuff is addictive and will warp your sense of priorities! ...
Crystals of the tetragonal system: a bipyramid at left and a prism and two bipyramids (e.g., zircon) at right. Note the vertical crystallographic axis differs in length from the two horizontal axes. Enlarge Photo credit: © WGBH Educational Foundation ...
It forms prismatic crystals ( tetragonal system ) and columnar, granular, or massive aggregates that are usually brown or green.
Tetragonal System - Crystallization system having two equal horizontal axes at right angles to each other, and a vertical axis of a different length at right angles to the other two. (Zircon, Cassiterite) ...
Tetragonal System
Rhombohedric (Trigonal) System
Orthorhombic System
Monoclinic System
Triclinic System
The above seven crystal systems are listed in order of their decreasing symmetry.
diamond, garnet, spinel
Tetragonal systems
3 crystallographic axes at right angles to each other - two of equal length, one longer or shorter
5 ...
The shape of a unit cell is different in each of the crystal systems: a cube in the cubic system, a "brick" for the tetragonal system, etc.
In crystals of the tetragonal system each face is an identical isoceles triangle; this variant of the tetrahedron is called a tetragonal tetrahedron.
It is a translucent honey-coloured crystal which can be polished and faceted to form striking gemstones. It crystallizes in the tetragonal system and occurs both in good crystals and as formless masses. It is soft with a Mohs hardness of 2 to 2.
The seven unique crystal systems, listed in order of decreasing symmetry, are: 1. Isometric System, 2. Hexagonal System, 3. Tetragonal System, 4. Rhombohedric (Trigonal) System, 5. Orthorhombic System, 6. Monoclinic System, 7. Triclinic System.
Within each of the systems, the cyrstals can mineralize into different crystal habits (form). The seven crystal systems are: cubic systems, tetragonal systems, hexagonal systems, trigonal systems, orthorhombic systems, monoclinic systems, ...
The seven crystal systems are: cubic systems, tetragonal systems, hexagonal systems, trigonal systems, orthorhombic systems, monoclinic systems, and triclinic systems. For more information on crystal systems, click here.
 See also: Crystal, Crystals, Crystal System, Mineral, Minerals
  
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