Which one of the following minerals is NOT a naturally occurring silic

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Which one of the following minerals is NOT a naturally occurring silicate ?

Feldspar
Zeolite
Mica
Bauxite
This question was previously asked in
UPSC CAPF – 2020
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Bauxite is the principal ore of aluminium and is primarily composed of hydrated aluminium oxides and hydroxides, such as gibbsite, boehmite, and diaspore, often mixed with iron oxides, clay minerals, and quartz. It does not have the silicon-oxygen tetrahedral structure characteristic of silicate minerals. Feldspar, Zeolite, and Mica are all well-known families of naturally occurring silicate minerals.
Silicate minerals are composed of silicon and oxygen, often with other metals, forming structures based on the SiO₄⁴⁻ tetrahedron unit. Non-silicate minerals lack this fundamental structure.
Feldspars are tectosilicates, zeolites are porous tectosilicates, and micas are phyllosilicates (sheet silicates). Bauxite is classified as an oxide mineral.

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