Hematite tumbled stones with the specular metallic luster that distinguishes this iron oxide from any other lapidary mineral. Silver-gray to black color on polished surface; between 20 and 30 mm in diameter and 15 to 25 grams in weight. Its high density (~5.3 g/cm³) makes hematite feel characteristically heavy in the hand: it weighs almost twice as much as a quartz tumbled stone of the same size.
Material Data Sheet
| Mineral |
Hematite (Fe₂O₃), iron (III) oxide |
| Color |
Silver-gray to metallic black on polished surface; reddish-brown streak (key diagnostic) |
| Size |
20-30 mm diameter; 15-25 g |
| Shape |
Tumbled; rounded outline |
| Finish |
Mirror polish with specular metallic luster |
| Hardness |
5-6 Mohs |
| Density |
~5.3 g/cm³ — noticeably heavier than quartz (~2.65 g/cm³) for the same size |
| Origin |
Brazil (Minas Gerais), Morocco, Spain (Almería) |
| Treatment |
Untreated. The metallic luster and gray color are native properties of the mineral |
| Piece type |
Lot; intuitive selection by luster and weight |
How hematite is formed
Hematite is the most abundant iron oxide in the Earth's crust and forms in three main contexts. In banded iron formations (BIFs), it precipitated 2.4-1.8 billion years ago when free oxygen began to accumulate in the oceanic atmosphere and oxidized dissolved iron. In hydrothermal contexts, hot fluid circulating through fractures deposits hematite in veins alongside quartz and calcite. In metamorphic environments, heat and pressure reorganize pre-existing iron oxides and produce the high-luster specular variety—called specular hematite—whose platy crystals are responsible for the metallic reflection of polished tumbled stones.
What this format is good for
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Wire wrap — the 5-6 Mohs hardness allows working with fine to medium gauges (0.6-1.0 mm); the metallic luster combines particularly well with silver (cold-silver contrast), copper (industrial feel), and oxidized brass
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Macrame — the noticeable weight (15-25 g) suggests its use for long necklaces and thick cord pieces; avoid earrings unless the design is made to accommodate that weight
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Pocket stone — the high density and cool texture of the metallic polish make hematite one of the most recognizable tumbled stones by touch; historically it is associated with grounding and stability
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Iron oxide collecting — contrasts with limonite (yellow), goethite (brown), and magnetite (also metallic but magnetic) in thematic collections of iron minerals
Hematite in cultural tradition
The use of hematite as a red pigment—when powdered, the mineral leaves a reddish-brown streak—is documented since the Paleolithic: red ochre made from ground hematite appears in 100,000-year-old burials in South Africa and in cave paintings across Europe. The Greek name αἱματίτης (haima = blood) refers to the color of the streak and powder. The Romans called it lapis haematites and believed it protected soldiers in battle; polished hematite has been found in Celtic and Iberian necropolises as an amulet. In modern crystal therapy readings, it is associated with grounding, protection, and concentration, extending the historical image of a mineral linked to physical strength.
The symbolic properties attributed to minerals belong to cultural and historical traditions. They are shared for educational purposes, not as medical advice or a substitute for professional care.
How to recognize genuine hematite
The most reliable test is the streak: rub hematite on unglazed ceramic or the back of a tile. Genuine hematite leaves an unmistakable reddish-brown streak even if the surface of the mineral is metallic-gray. Reconstituted hematine (hematite powder compacted with resin) leaves a similar streak but weighs less and may show bubbles under magnification. Magnetite—also black and metallic—is strongly magnetic: it clearly sticks to a refrigerator magnet. Natural hematite is non-magnetic or barely paramagnetic to very powerful magnets, and does not stick under normal conditions.
Frequently asked questions
Is hematite magnetic?
Pure natural hematite is not magnetic under normal conditions. Tumbled stones sold as "magnetic hematite" are usually reconstituted hematine (hematite powder + resin + magnetic iron oxide particles) or magnetite. A practical test: bring a standard refrigerator magnet close. Natural hematite will not stick; magnetic hematine or magnetite will.
Why is the streak red if the mineral appears gray?
The surface color reflects how crystals scatter light. The streak reveals the color of the mineral's powder in very fine particles, which is reddish-brown because it absorbs blue-green wavelengths and reflects red. It is the most reliable mineralogical signature of hematite: a seemingly metallic and gray mineral with a red streak.
Can hematite get wet?
Yes, it tolerates contact with water. Dry thoroughly after cleaning. Hematite is an already oxidized and stable iron oxide; it does not oxidize further under normal conditions. Avoid prolonged exposure to chlorinated water or acids, which can attack the polish in the long term.
Which metals combine best with it in wire wrap?
Silver (elegant silver-gray contrast), copper (warm-industrial feel where the red of copper and the metallic gray of hematite complement each other), and oxidized brass (dark tone that reinforces the mineral look). Black or anthracite anodized aluminum also works for pieces with a more contemporary aesthetic.
Is it heavy compared to other tumbled stones of the same size?
Yes, noticeably. The density of hematite (~5.3 g/cm³) is approximately double that of quartz (~2.65 g/cm³) and exceeds that of garnet (~4.3 g/cm³). A 25 mm hematite tumbled stone weighs between 15 and 20 g; a quartz one of the same diameter is around 8-10 g. This characteristic weight is one of the features that make it easy to identify without tools.
See also: all tumbled stones · meditation stones · cabochons.
