Which type of rock is most resistant to both chemical and mechanical weathering?

Which type of rock is most resistant to both chemical and mechanical weathering? Correct Answer Quartzite

Quartzite is most resistant to both chemical and mechanical weathering. It is a hard metamorphic rock. Quartzite is a decorative stone and may be used to cover walls, as roofing tiles, as flooring, and stair steps.

Chemical Weathering is as a result of chemical reactions on the mineral rocks and agents like water or air.

• Oxygen oxidizes the minerals on the rocks to alteration products.
• Water turns minerals to clay or dissolves them.
• All this takes place majorly in hot and humid conditions.
• Chemical weathering results in formation of new minerals and salts as a result of chemical reaction between rainwater and mineral grains in the rocks.
• Slightly acidic water results in Chemical weathering.
• Oxidation, Solution and Carbonation are all Chemical Weathering processes.
• Oxidation or Rusting is the reaction of rocks with oxygen and hence a chemical weathering process.
• Solution chemical weathering is when minerals dissolve in acidic solutions. Example - Limestone dissolving in Carbonic Acid.
• Carbonation involves mixing of Carbon Dioxide with water to make carbonic acid and is a type of chemical weathering.