The internal arrangement of atoms.
The hardness, density, and crystal structure.
of crystals.
The rate of cooling of the magma determines the type of mineral formed by the magma or lava..
Sodium's crystal structure is cubic.
A ruby is a crystal form of the mineral corundum.
Opal doesn't have a crystal shape, it's amorphous.
No. A crystal is the solid form of a mineral. Mineral crystals are present in nearly every rock, regardless of type.
An antifluorite is a type of crystal structure in which the cations and anions in a crystal lattice are arranged in a specific pattern. In an antifluorite structure, the anions occupy the positions that cations would normally occupy, and vice versa. This results in a reversed or "anti" arrangement compared to the more common structure of fluorite.
Americium crystal has a hexagonal type crystalization.
No one knows my namestake like I do (except Crystallography majors) and in reality obsidian is not quite classified as a type of crystal at all, as its composition is too complex to comprise a single mineral, it's usually just considered a mineraloid.
Argon has a face-centered cubic structure.
crystal structure