Final answer:
The chlorite group of minerals and the true micas differ in their crystal structure and the arrangement of the tetrahedral and octahedral sheets.
Step-by-step explanation:
The structure of the chlorite group of minerals differs from that of the true micas in terms of their crystal structure and chemical composition. Chlorite minerals belong to the phyllosilicate group and have a layered structure with tetrahedral and octahedral sheets. The tetrahedral sheets consist of silicon and oxygen atoms, while the octahedral sheets consist of aluminum, magnesium, and/or iron ions.
On the other hand, true micas belong to the sheet silicate group and also have a layered structure. However, the tetrahedral and octahedral sheets in true micas are arranged in a specific pattern, known as the mica structure. The tetrahedral and octahedral sheets alternate to form a sandwich-like structure, with potassium, sodium, or calcium ions located between the layers.
So, in summary, the chlorite group of minerals and the true micas differ in their crystal structure and the arrangement of the tetrahedral and octahedral sheets.