長石 (ちょうせき, chōseki) is a group of minerals known as feldspar, which are commonly found in the Earth's crust. They are essential components of many types of rocks, including 花崗岩 (granite) and 火成岩 (igneous rocks). Long recognized for their importance in geology, feldspar minerals are primarily composed of aluminum, silicon, and oxygen. These minerals are widely used in various industries, including ceramics, glassmaking, and as fillers in paints and plastics. Their ability to withstand high temperatures and their chemical stability make them valuable in manufacturing processes. Long-term exposure to weathering can also lead to the formation of soil, contributing to the Earth's ecosystem.