Discuss the megascopic and microscopic characters of following rocks:

a) Limestone

b) Gneiss

a) Limestone:

Limestone is a sedimentary rock composed mainly of calcium carbonate (CaCO3) in the form of mineral calcite. It is a soft and easily workable rock with a dull to earthy luster. Limestone can be identified based on both megascopic and microscopic characters, which are discussed below:

Megascopic characters:

• Limestone is typically light-colored, ranging from white to gray, yellow, or brown.
• It is a relatively soft rock with a hardness of 3 on the Mohs scale.
• Limestone often contains visible fossils, such as shells or other marine organisms.
• It may exhibit a crystalline texture or a fine-grained texture, _______ __________ ______ __________ _____.
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