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  4. How many of the following are the minerals of aluminium? Magnesite, cryolite, kaolinite, malachite, epsum salt, bauxite, cuprite

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Q. How many of the following are the minerals of aluminium?
Magnesite, cryolite, kaolinite, malachite, epsum salt, bauxite, cuprite

NTA AbhyasNTA Abhyas 2022

Solution:

Cryolite $Na _3 AlF _6$, kaolinite $Al _2 OH _4 Si _2 O _5$ and bauxite $Al _2 O _3 \cdot 2 H _2 O$ are the minerals of aluminium.
Cryolite ores are the chief ore of aluminium of chemical formula $Na_3AlF_6$. It is also used to give fireworks a yellow color.
Kaolinite is a clay mineral of chemical formula $(Al_2O_3)_2 SiO \cdot 2 H_2 O$. It is a soft, earthy, usually white, mineral.
Cuprite, soft, heavy, red oxide mineral $(Cu_2O)$ that is an important ore of copper.
Malachite is a copper carbonate hydroxide mineral, with the formula $Cu_2 CO_3( OH )_2$.
This opaque, green-banded mineral crystallizes in the monoclinic crystal system.