Are particles and crystallites the same thing?

Question

I'm having trouble understanding the terms crystallite, particle and grain. Here is what wikipedia says for grains: " Grain size refers to the physical dimensions of individual particles of rock or other solid". But when I look up particle, it does not list the geological sense of the word. For crystallite, wikipedia says this: "A crystallite is a domain of solid-state matter that has the same structure as a single crystal". Does this mean that a particle is a crystallite?

Thanks, so a particle can be different from a crystallite. But, I'm still unclear on the definition of a particle (in this context).

Answer 1

a crystal is highly symmetric in nature.........
as they are very stable.
particle can be crystalline, maybe amorphous anything
but if it is a particle of a crystal then it has all properties of that crystal.

Answer 2

A crystaline structure requires atoms to join up into a molecule. Crystallite particle refers to molecular. Particle's are sub-atomic and comprise the make up of atoms