It is a system of classification of crystals into 7 crystal systems(Cubic,Tetragonal,Othorgonal,Hexagonal,Trigonal.Monoclinic and Triclinic) on the basis of their Geometrical properties and symmetry (Diads,Triads,Tetrads,Planes of symmetry,Centre of symmetry)
Corundum is in the trigonal crystal system.
hexagonal crystal system ( 6 sided )
Mercury, at solidification temperatures, is classified in the trigonal crystal system.
it is hexagonal
Knowing a mineral's crystal system helps researchers understand its atomic structure and physical qualities.
Corundum is in the trigonal crystal system.
hexagonal crystal system ( 6 sided )
Fluorite belongs to the same crystal system as salt - the cubic (also known as the isometric) crystal system.
Six crystal classes are known.
Gypsum and orthoclase feldspar are in the monoclinic crystal system.
Three axes.
I believe the answer would be the crystal system, but the crystal system is based on the angles and length of the axis of the crystal. The axis length and the angle at which they meet would affact the number and angle of the crystal faces.
symmetry
7
Diamond is one mineral in the isometric crystal system.
Mercury, at solidification temperatures, is classified in the trigonal crystal system.
The ISOMETRIC crystal system, also referred to as CUBIC.