Fracture

JOINT

Joint are those fracture or cracks which shows no relative displacement between surfaces.
Joints are found in every rock type, it may be horizontal, vertical or inclined.

Vertical to sub-vertical joints

Joint set
If many joints show same geometry, like dip, strike called joint set.

Three joint set (Mural joints)

Joint system
Two or more joint sets together formed joint systems.

Joints characteristics:

Joint inclination direction
Joint inclination angle
Joint trend
Joint surface
Joint filling
Joint persistence 

Joint aperture
Joint spacing

Joints type:
On the basis of genesis
a) Tensional joints
b) Shear joints
c) Compressional joints

On the basis of geometry:
a) Strike joints
b) dip joints
c) Oblique joints
d) Bedding joints
e) Cross joints

On the basis of spatial relationships:

a) Systematic joints

b) Non-systematic joints

Miscellaneous joints category:

a) primary joints 

Open Joint 

i) Mural joints

ii) Sheet joonts

iii) Columnar joints

b) Open joints

c) Close joints

d) Master joints