Haematite, the blood stone in seals and magical gems

Haematite is an iron oxide, dark grey and metallic in colour, which nevertheless gives off an intense red pigment when it is scratched or ground to powder. This chromatic surprise explains its name, from the Greek haima, blood, and much of its symbolic history. From the red ochre already used in prehistory to Mesopotamian seals and the engraved gems of the Roman age, haematite has linked the mineral world with that of blood and life.

Theophrastus, Pliny and the magicians

The first Greek treatise devoted to stones, the Peri lithon of Theophrastus, written towards the end of the fourth century BC, already mentions the stone called haimatites. Pliny the Elder, in the Natural History, distinguishes several varieties and reports the opinions of earlier authors on its supposed virtues, many of them based on the analogy with the colour of blood rather than on observation. It is an early example of what would later be called the doctrine of signatures, according to which the appearance of a thing reveals its virtue.

Among others, Pliny mentions Zachalias of Babylon, who in books dedicated to King Mithridates attributed human destiny to gems and gave haematite the power to favour those presenting petitions to rulers or facing a lawsuit. Pliny himself does not hide his distrust of these authors, who in his judgement exaggerated the virtues of stones beyond all measure.

Mesopotamian seals and Egyptian amulets

In Mesopotamia haematite became, in the Old Babylonian period, one of the most widely used materials for cylinder seals, small engraved rollers run over fresh clay to sign documents and close containers. The stone was hard, compact and took a high polish, allowing minute carvings of deities and ritual scenes. The seal was both a legal object and a personal talisman, often worn at the neck or wrist by its owner.

In Egypt too haematite was used for amulets, including those shaped like headrests that were placed among the wrappings of mummies in the Late Period. According to funerary texts, the headrest was meant to raise and protect the head of the deceased, preventing it from being taken away. The dark, shining colour of the stone suited an object destined for eternity.

Magical gems of the imperial age

In the Roman imperial age, roughly between the second and fourth centuries AD, haematite was among the favourite stones for the so-called magical gems: small stones engraved with divine figures, mysterious names and Greek inscriptions. Many examples kept in museums bear images linked to the protection of the body and of motherhood. The American scholar Campbell Bonner published a broad study of them in 1950, Studies in Magical Amulets, which remains a reference work in the field.

The long success of haematite arises from an analogy: the dark stone that bleeds red. On this resemblance ancient cultures built a whole system of beliefs, which medieval lapidaries, from Marbod to Albertus Magnus, would collect and pass on. Today those virtues should be read as evidence of a way of thinking through correspondences, while the seals and engraved gems remain precious works of miniature art.