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I don't know exactly but I do have geoides that are ugly on the outside but when you open them up they have crystals on the inside.
The internal atomic structure of a mineral most likely determines the mineral's hardness, cleavage and crystal shape.
yes
The internal arrangement of atoms.
Atomic structure, Chemical composition and External form.
A Chemical composition, a definite internal atomic structure and an external form.
Internal and external processes
Amber is not a mineral, because it has an organic origin and amorphous structure (no orderly internal arrangement of atoms).
In order to be a mineral, substances need to have fixed internal crystalline structure. Natural glass does not.
The internal atomic structure.
The internal atomic structure.
Using a rock hammer to break the mineral apart I know this because I am a earth science teacher for 15years