Bloodstone is a variety of chalcedony, which belongs to the quartz mineral family. Its chemical composition is silicon dioxide (SiO₂), and it crystallizes in the trigonal crystal system, although it typically appears in massive (non-crystalline) form. The name “Bloodstone” comes from its distinctive appearance—dark green with red spots that resemble blood, caused by iron oxide inclusions. The base color of Bloodstone is usually deep green, while the red spots are due to hematite or iron oxide. Some stones may also show yellow or brown inclusions. Bloodstone is typically opaque, though it can occasionally be slightly translucent at thin edges. It has a waxy to vitreous luster, giving it a smooth and polished appearance when cut.