Hematite is iron oxide, Mohs 5 to 6, used for grounding, boundaries, steadiness. The mineralogy, whether it is safe in water and sunlight, what gets substituted for it, and what a stone can honestly do.
The RubyAstro TeamPublished September 11, 2026Dates checked September 11, 20265 min read
Hematite: Fe2O3, Mohs 5 to 6. Not safe in water.
The short answerHematite is iron oxide, Fe2O3, Mohs hardness 5 to 6. It is used for grounding, boundaries, steadiness, and associated with the Root chakra. On care, the short version: keep it out of water entirely, and sunlight does no harm.
What hematite actually is
Start with the mineralogy, because most of the bad advice about this stone follows from not knowing it. Hematite is iron oxide. On colour: Iron. The name is from the Greek for blood, because hematite leaves a red streak no matter how black the polished surface looks.
Where it comes from: Brazil, Canada and the Lake Superior region. Hematite is the world's main ore of iron.
Hematite at a glance
Property
Value
Mineral species
Iron oxide
Chemical formula
Fe2O3
Mohs hardness
5 to 6
Crystal system
Trigonal
Chakra
Root
Usually linked to
Aries and Capricorn, and to Mars
Hardness matters more than it sounds. The Mohs scale runs from talc at 1 to diamond at 10, and anything below about 5.5 can be scratched by ordinary window glass or by the quartz dust in everyday grit. At 5 to 6, hematite is soft enough to damage in a pocket with keys or in a bowl with other stones. Keep it separate.
What hematite is used for
The heaviest-feeling stone most people will hold, and used accordingly: for grounding, for anxiety that lives in the body, and for anybody who needs to feel attached to the floor.
In the shorthand most shops and books use, it is a Root stone, and the three words attached to it most often are grounding, boundaries, steadiness.
Water, sunlight and salt
This is the section that matters, and the one most pages get wrong. Cleansing advice is handed around as though every stone were the same mineral, and it is not. Here is what hematite will actually survive.
Caring for hematite
Method
Safe?
Why
Water
No
Never in water.
Direct sunlight
Yes
Direct sunlight does no damage.
Salt or salt water
No
No salt, dry or dissolved. It is abrasive and it attacks softer and porous stones.
Moonlight
Yes
Harmless to every stone on this list, which is most of why it is the method that suits everything.
Smoke, sound or breath
Yes
Nothing physical touches the stone, so nothing can be damaged by it.
Before you put hematite anywhereHematite rusts. It is an iron oxide and prolonged contact with water will dull the mirror polish and eventually pit the surface. The magnetic hematite sold in bracelets is a different thing entirely: it is a manufactured ceramic, not a natural stone, because natural hematite is only very weakly magnetic.
Buying hematite without being had
If it sticks firmly to a fridge magnet it is not natural hematite. That accounts for most of the hematite jewellery on the market, which is usually sold as magnetic hematite or hematine and is a synthetic barium-strontium ferrite.
Two general rules that hold across the whole shop. If the price is far below everything else on the shelf of that size, something has been substituted or treated. And a stone sold with no locality at all is usually one the seller cannot trace, which in this trade often means tumbled, dyed and bagged somewhere a long way from where it came out of the ground.
The astrology people attach to it
Hematite is usually linked to Aries and Capricorn, and to Mars. Worth being straight about this: crystal and zodiac pairings are modern, they are not consistent between sources, and two reputable books will give you two different signs for the same stone. They are a useful organising idea rather than a tradition with a single lineage behind it.
If you want the part of this that does have a fixed method behind it, the Sun in Aries sets out what that sign actually describes, and it is calculated from a date rather than assigned by a writer.
How people actually use hematite
Pick one thing for it to mean. A stone with four jobs has none. Grounding is enough.
Put it where the thing happens, not where it looks good. A stone for sleep belongs by the bed; a stone for nerve belongs in the pocket you will actually reach into.
Handle it. The whole mechanism such as it is runs on the object interrupting you and reminding you of the thing you decided. A stone in a drawer does nothing.
Clean it by whatever method the table above allows, when it feels due rather than on a schedule somebody else set.
A word on crystal elixirsPutting stones in drinking water is a popular practice and a genuinely risky one. Several common minerals are toxic, soluble or both: malachite is a copper carbonate, cinnabar contains mercury, galena is lead, and selenite simply dissolves. If you want to make an elixir at all, use the indirect method, with the stone in a sealed glass container standing inside the water rather than in it.
What a stone can and cannot doNo crystal treats an illness, and no controlled study has found that one does. What the practice reliably provides is a physical object attached to an intention, which is a genuinely useful thing: it is a reminder you can hold, and keeping something in your pocket that means one specific thing works the way any ritual works. Nothing on this page should be used in place of medical advice, and nobody should delay treatment for it.
If you want something built from your own details
Every piece of hematite in the shop is the same stone with the same associations, which is both the appeal and the limit of it. A birth chart is the opposite: it is calculated from your date, time and place and it describes one person. If you do not know your birth time, this covers how to find it.
Questions people ask
Can hematite go in water?
No. Hematite rusts.
Does hematite fade in sunlight?
No. Sunlight does not damage it.
What is hematite used for?
Grounding, boundaries, steadiness. It is associated with the Root chakra.
How hard is hematite?
Mohs 5 to 6. That is soft, so keep it away from keys, grit and harder stones.
What gets sold as hematite?
If it sticks firmly to a fridge magnet it is not natural hematite.
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