Hematite crystals are usually tabular, from thick to thin, with enhanced basal planes, often displaying triangular marks. Thin hematite plates can be grouped in rosette shapes, they are iron red, as in the figure above. Hematite specularite variety is the one with flat and glossy faces that reflect images are mirrors.
This sample is from Diamantina (MG).
The name hematite comes from the Greek ‘hemos’, meaning ‘blood’. That is due because hematite, as it is transformed into dust, it becomes reddish.
This mineral is the main iron source, the most common, cheap and relevant metal and it is used in several products, especially as it is transformed into steel. Hematite photo credit: Henry Yu
Source: MM Gerdau - Museu das Minas e do Metal -