First slide

13th group or boron group

Question

Which of the following minerals does not contain aluminium?

Moderate

A

cryolite
B

mica
C

feldspar
D

fluorspar

Solution

cryolite – ${Na}_{3} {AlF}_{6}$
$\begin{array}{l} Mica - {KAlSi}_{3} O_{8} \\ feldspar - K_{2} O . 3 {Al}_{2} O_{3} . 6 {SiO}_{2} \cdot 2 H_{2} O \\ fluorspar - {CaF}_{2} \end{array}$

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