Question

What is the most abundant mineral on Earth's crust ?

Answer 1

More than 90% of the crust is composed of silicate minerals. Most abundant silicates are feldspars (plagioclase (39%) and alkali feldspar (12%)). Other common silicate minerals are quartz (12%) pyroxene (11%), amphibole (5%), mica (5%), and clay minerals (5%).
I think it is correct.

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Answer 2

Silica, or silicate minerals