Quartz is a crystalline variety of

Silica

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Sodium silicate

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SiC

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Silicon

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Solution

The correct option is A Silica
Quartz is a covalent crystal of silica.

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COMPREHENSION # 1

The name 'Silica' covers an entire group of minerals, which have the general formula $S i O_{2}$ , The most common of which is quartz. Quartz is a framework silicate with $S i O_{4}$ tetrahedral arranged in spirals. the spirals can turn in a clockwise or anticlockwise direction a feature that results in there being two mirror images, optically active, varieties of quartz.

The following pictures represent various silicate anions. Their formulae are respectively:

Q. Quartz is the type of silicates:

Read the following short write-up and answer the questions at the end of it The name 'silica' covers an entire group of minerals, which have the general formula

S i O_{2}

, the most common of which is quartz. Quartz is a framework silicate with

S i O_{4}

tetrahedra arranged in spirals. The spirals can turn in a clockwise or anticlockwise direction- a feature that results in there being two mirror images, optically active, varieties of quartz.

The following pictures represent various silicate anions. Their formulae for silicon and oxygen respectively:

Different forms of silica such as quartz, tridymite and cristobalite are as follows:
Quartz $870^{\circ} C ⟶$ Tridymite $1470^{\circ} C ⇌$ Cristobalite