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it is the property of solid crystal that they have straight edges and flat faces.
Any ellipsoid, including the sphere.
that is a cube
triangula prism
This shape is a cube.
it is the property of solid crystal that they have straight edges and flat faces.
A flat (2D) shape triangle has 3 straight edges. A triangular pyramid has 6 straight edges. A square pyramid has 8 straight edges. (Note, some vertical edges have already been counted as you move from one face to the next.)
sphere
No, a pyramid is a polyhedron with flat faces and straight edges.
Any ellipsoid, including the sphere.
Not all crystals have smooth edges. The only crystals that I think have smooth edges are water worn ones. So your answer is no.
Polyhedron is a geometric solid in three dimensions with flat faces and straight edges.
that is a cube
triangula prism
Yes. Triclinic crystals are usually flat with sharp edges though they don't have right angles. ex. feldspar
This shape is a cube.
There are 12 edges on a cube. There are 5 flat surfaces (planes) on a cube as well.