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GS Geography Physical Geography of World
Q.

Which of the following is not an Igneous Rock?
Explanation:

ANS. (A) 
Dolomite is a common sedimentary rock-forming mineral composed of calcium magnesium carbonate, ideally CA Mg (CO3)2. It is the primary component of the sedimentary rock known as goldstone and the metamorphic rock known as dolomitic marble. Limestone that contains some dolomite is known as dolomitic limestone.

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