The Seven Crystal Systems
 What are the seven crystal systems?
There are 7 systems, through which crystals can be classified by analyzing their atomic structure or lattice; atomic structure or lattice is known to be the network of threedimensional placed atoms that are particularly arranged by a pattern symmetrically. For determining the crystal system the shape of lattice structure will be classified according to their appearance and physical properties for identifying the stone belongingness. In the practice of crystal healing, the crystal’s axial symmetry is majorly influenced by metaphysical properties directly. For instance, cubic system crystals are majorly believed to exist in the grounding of the earth. because the cube is simply known to be the symbol of the earth element (Acevedo, 2015).
Tetragonal
For the analysis of the Tetragonal system, the two equal length axes are required in the same plane, with a longer or shorter main axis. Also, the rest of the three rightangle intersects will be required. Based on the inner rectangular structure shape of the crystal can include a prism with four sides, a double or 8 sided pyramid, hexacisochedron, trapezohedrons, and Icositetrahedron.
Orthorhombic
All the threeaxis will have different lengths combining at each other’s right angles. Based on the inner structure of the rhombic shape, crystals include rhombic prisms, double pyramids, and pinacoids.
Trigonal
The angles and axis will be similar to the hexagonal system. The crosssection 2 system will be combined with a hexagonal crystal with 6 sides. Hexagonal
Monoclinic
Characterized by having only mirror plane(s) or a single 2fold axis.
The resultant lattice will consist of an ordered stacking of blocks, or unit cells, if the atoms or atom groups in the solid are represented by points and the points are linked. The monoclinic unit cell may be rotated by 180 degrees along a single axis, known as an axis of twofold symmetry, without the cell's appearance altering. The monoclinic system is home to more solids than any other. The monoclinic system is used for the crystallization of betasulfur, gypsum, borax, orthoclase, kaolin, muscovite, clinoamphibole, clinopyroxene, jadeite, azurite, and spodumene.
Triclinic
All of the threeaxis will be inclined with different lengths towards each other. Three axes with different lengths and nonorthogonal (nonperpendicular) degrees of inclination.
If the atoms or atom groups in the solid are represented by points and the points are linked, the resultant lattice will be made up of a neatly stacked arrangement of units, or cells. The form of the triclinic unit cell is the least symmetrical of all unit cells. In the triclinic system, crystals of turquoise and other minerals, including microcline, form.
Isometric or Cubic System
It can be analyzed through to their threeaxis with properties of a right angle intersect with equal length. Based on the inner structure of the square the shape of the crystal includes Octahedron, cube, Icositetrahedron, Rhombic dodecahedron, and Hexacisochedron (Song, 2012).
Crystal System  Diagram  Example 

Cubic a = b = c; α = β = γ = 90° 
Pyrite 

Tetragonal a = b ≠ c; α = β = γ = 90° 
Wulfenite 

Orthorhombic a ≠ b ≠ c; α = β = γ = 90° 
Aragonite 

Monoclinic a ≠ b ≠ c; α ≠ 90° = β = γ 
Azurite 

Rhombohedral a = b = c; α = β = γ ≠ 90° 
Calcite 

Triclinic a ≠ b ≠ c; α ≠ β ≠ γ ≠ 90° 
Microcline 

Hexagonal a = b ≠ c; α = β = 90°, γ = 120° 
Beryl 
Unit Cells
Summary
 A crystal is a substance in which the particles are arranged in an orderly, repeating, threedimensional pattern.
 The crystal lattice is the threedimensional arrangement of a solid crystal.
References
Acevedo, N. C., & Marangoni, A. G. (2015). Nanostructured fat crystal systems. Annual review of food science and technology, 6, 7196.
Song, P., Cao, H., Wang, F., Ellahi, M., & Yang, H. (2012). Study of polymerdispersed liquid crystal systems using epoxies/acrylates as hybrid polymer matrix components. Liquid Crystals, 39(8), 903909.
This is very informative!
This is very informative!