10mm bullet bracelet Hematite from Morocco.

Hematite (from Greek: αιμία, haima, blood) is a mineral composed primarily of ferric oxide crystals (iron(III) oxide, Fe2O3), one of the iron oxides. It occurs alongside other varieties such as the red bloodstone and the gray-black to black iron shine and micaceous iron. The mineral has a hardness between 5 and 6. The so-called stripe, or stripe color, the color the mineral gives off when rubbed over an unglazed porcelain dish, is usually a characteristic blood red - this is how the mineral gets its name. The mineral may contain trace amounts of magnesium, manganese and titanium. Hematite occurs both as a corridor mineral and in sedimentary layers. It is often the cause of the red coloring of many rocks. Other iron ores such as magnetite, limonite and iron spar often occur together with hematite. When magnetite has been converted to hematite, it is called martite. The mineral occurs worldwide, in Europe in Germany, among others, in the Lahn area, where the world's largest concentration of iron ores is located.