Solved UPSC CDS/OTA Question
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Q · Mineralsmedium · 45s
Which mineral is used to make glass?
TopicMinerals
Question Typemultiple choice
Difficultymedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
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Both quartz and feldspar are essential minerals in glass manufacturing. Quartz provides silica (SiO₂), the primary component of glass, while feldspar acts as a flux, lowering the melting temperature and improving workability. Feldspar also contributes alumina and alkalis that enhance glass durability and chemical resistance. This combination creates the transparent, hard material we know as glass.
Final Answer: Option D - Both A and B