Q. Which among the following is formed by recrystallization of Silica found in Sandstone?
Answer: Quartzite
Notes: Quartzite is formed by the recrystallization of silica found in sandstone. Quartzite is a hard, non-foliated metamorphic rock that was originally sandstone. The transformation from sandstone to quartzite happens through recrystallization. The heating and pressure that causes the transformation is usually related to tectonic compression within orogenic belts.
Quartzite is composed almost entirely of quartz. The quartz grains from the original sandstone are enlarged and interlocked by recrystallization. Quartzite does not tend to be foliated because quartz crystals don't align with the directional pressure.
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