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4 x 1 x 5cm Hematite is a heavy and relatively hard oxide mineral. It is made of ferric oxide. It constitutes the most important iron ore because of its high iron content (approximately 70 percent) and its abundance. Its name comes from its Greek meaning, "blood". Hematite is unusual in that its macrocrystalline forms are incongruent, while its particulate forms are congruent. When it is formed congruently, it has a red color to it and when formed incongruently, it is a silvery-black color. ***Due to natural variations in stones, the appearance will vary***