Cassiterite is a mineral composed primarily of tin dioxide (SnO2) and is the main ore of tin. It typically appears in a brown or black color, often with a shiny, metallic luster. Found in igneous and metamorphic rocks, cassiterite is commonly mined in regions such as China, Indonesia, and Bolivia. The extraction of tin from cassiterite is crucial for various industries, including electronics and packaging. Tin is used to create alloys, such as bronze, and to coat other metals to prevent corrosion. The demand for tin continues to grow, making cassiterite an important resource in the global market.