18.15 ct HEMATITE – MEXICO

Hematite
Hematite might be one of the most common minerals on Earth, but have you ever actually seen it as a faceted gemstone? Most people are used to seeing it as a dull red ore or a simple tumbled stone, but the moment you lift a high-quality rough crystal, you realize you’re dealing with something different. It is heavy—pure iron oxide—and that density presents a challenge on the lap. I was intrigued by that weight and the metallic luster, so I decided to move past the typical cabochon and see what a proper faceted cut could do for a mineral this “industrial.”

The Heritage & Discovery

Historical Significance: For millennia, Hematite has been the world’s primary source of iron. Its name comes from the Greek word “haimatitis,” meaning blood-red, a nod to the color of the mineral when it is ground into powder. From Paleolithic cave paintings to Roman intaglios, it has been used as a pigment and a protective amulet. In the Victorian era, it was a staple for “mourning jewelry,” prized for its somber, metallic sheen.

Discovery: Because it is so abundant, there is no single “discovery” date for Hematite; it has been part of human history since we first began using tools. It is found in massive sedimentary deposits known as Banded Iron Formations (BIFs), which represent some of the oldest geological processes on our planet.

Important Mines: While it is mined on a massive scale in places like Brazil, Australia, and China, the “collector-grade” specular crystals—those with the high metallic luster suitable for faceting—often come from Minas Gerais, Brazil, or the Cumberland region in England. These locations produce the dense, mirror-like rough that I prefer for more ambitious cutting projects.

Mineralogical Profile

Description: Hematite is an iron oxide that crystallizes in the trigonal system. It is opaque with a metallic to sub-metallic luster that can be polished to a mirror finish. It sits at a 5.5 to 6.5 on the Mohs scale, which makes it durable, but its high specific gravity (around 5.3) means that even a small gemstone feels substantial in the hand. The true signature of Hematite is its streak; even the most metallic, silvery specimen will leave a distinct blood-red mark when rubbed across a streak plate.

Chemical Formula: Fe₂O₃