(1) Crystalline is a solid in which the internal particles (molecules, atoms, ions) of minerals are arranged regularly to form a certain lattice structure, which is called crystalline (crystal). The result of the regular arrangement of the particles is shown as regular geometric shapes. Most minerals in nature are crystals.
(2) Amorphous: Any solid with irregular arrangement of particles (molecules, atoms, ions) inside a mineral without a lattice structure is called non-crystalline (or non-crystalline). This type of minerals is not widely distributed, and there are few types, such as volcanic glass.
Crystalline plastics include: PE, PP, POM, PA6, PBT, PET, PA66, PA6T, PA11, PA12 Amorphous
plastics include: ABS, PVC, PMMA, PS, PC, PPO, PSF, PES, PAI, PEI