We have discovered more than 4000 minerals and they have a crystalline structure inside the earth due to heat and various other reactions minerals and rocks melt together.
Difference between metals and ceramic crystals.
Mineralogy is the study of minerals.
The crystals in the solidified metal are called grains and the surfaces between them are named grain boundaries.
Fe ni al called cations and non metallic ions e g.
Differences between pure and soft metals and ceramics are very large but metalic materials and steel used for industrial machine and equipments hardened to give designed strength.
Industrial ceramics are commonly understood to be all industrially used materials that are inorganic nonmetallic solids.
O n cl called anions bonding will usually have some covalent character but is usually mostly ionic.
The key difference between minerals and crystals is that minerals are naturally occurring substances whereas crystals can be natural or synthetic.
I hope this answers your question.
Usually they are metal oxides that is compounds of metallic elements and oxygen but many ceramics.
Ceramic crystal structures broader range of chemical composition than metals with more complicated structures usually compounds between metallic ions e g.