Muscovite mica [KAl2AlSi3O10(OH)2 ]has nearly the same chemical formula as biotite mica [K(Mg, Fe)3AlSi3O10(OH)2]. They both form crystals that are platy sheets. Based on their chemical formula, predict how they are different in appearance.

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explanation:

covalent bonds

consist of pairs of electrons shared by two atoms, and bind the atoms to fixed orientation and requre high energies to break them

ionic bonds

when two atoms differ considerably in their electronegativity, then one of the atoms will lose its electron to the other atom. this results in a positively charged ion(cation) and a negatively charged ion (anion)

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