An ionic crystal is a crystal consisting of ions bound together by their electrostatic attraction.
Many minerals have multiple crystal habits, which are the size and shape of a particular mineral crystals formation. Examples of crystal habit include boytroidal, stubby, blocky, radiating, wheat...
Yes
If an ionic substance were melted, it would become a liquid made of ions; in this case the label "ionic liquid" could be applied.
the different types of crystal are sugar salt and rock.