Cassiterite is a mineral composed primarily of tin dioxide (SnO2) and is the main ore of tin. It typically appears in brown or black colors and has a high density, making it easy to identify. Cassiterite is often found in igneous rocks and alluvial deposits, where it can be mined for its valuable tin content. The extraction of tin from cassiterite is crucial for various industries, including electronics, construction, and packaging. Tin is used in soldering materials, coatings, and alloys, highlighting the importance of cassiterite in the global economy and technological advancements.