The most abundant mineral in the Earth's crust is feldspar. This group of minerals constitutes about 60% of the crust’s composition and plays a critical role in geological processes. Feldspar is primarily composed of aluminum silicate combined with varying amounts of potassium, sodium, and calcium. It occurs in various igneous, metamorphic, and sedimentary rocks, often found in granitic formations. The significance of feldspar extends beyond geology; it is also used industrially in glass and ceramic production, where its properties help improve strength, stability, and durability in finished products.