Question

Describe the physical properties of minerals belonging to feldspar group giving suitable examples.

19 Jan 2026
Answer :
Word Count : 495
Feldspars constitute the most abundant group of rock-forming minerals in the Earth’s crust and are alumino-silicates of potassium, sodium, calcium or barium. They show a range of physical properties that are sufficiently distinctive to aid their identification in hand specimens and thin sections. In general, feldspars are light-coloured minerals, commonly white, pink, grey or flesh-red, though green, yellow and bluish varieties also occur. Orthoclase and microcline are typically pink or flesh-coloured due to trace impurities, while albite is usually white, and anorthite may appear grey to colourless. The crystal system varies among the feldspars. Orthoclase belongs to the monoclinic
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