Question:
Which mineral is the primary source of clay formation?
Which mineral is the primary source of clay formation?
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Feldspar is the main parent mineral for clay formation because it decomposes by weathering to form clay minerals.
Updated On: May 7, 2026
- Feldspar
- Quartz
- Halite
- Gypsum
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The Correct Option is A
Solution and Explanation
Clay minerals are mainly formed by the weathering and decomposition of feldspar minerals.
Feldspar is one of the most abundant minerals in rocks.
When feldspar is exposed to water and atmospheric conditions for a long time, it undergoes chemical weathering.
This weathering process produces clay minerals such as kaolinite.
A simplified idea is:
\[
\text{Feldspar}+\text{Water}+\text{Carbon dioxide}
\longrightarrow
\text{Clay minerals}.
\]
Quartz is chemically more stable and does not easily form clay.
Halite is common salt:
\[
NaCl.
\]
Gypsum is:
\[
CaSO_4\cdot 2H_2O.
\]
They are not the primary source of clay formation.
Hence, the primary source of clay formation is:
\[
\text{Feldspar}.
\]
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