Crystals
Kyanite is aluminium silicate, Mohs 4.5 along the blade, 6.5 to 7 across it, used for alignment, clear speech, cutting through. The mineralogy, whether it is safe in water and sunlight, what gets substituted for it, and what a stone can honestly do.
Start with the mineralogy, because most of the bad advice about this stone follows from not knowing it. Kyanite is aluminium silicate. On colour: Iron and titanium in the aluminium silicate structure.
Where it comes from: Nepal, Brazil, Switzerland and North Carolina.
| Property | Value |
|---|---|
| Mineral species | Aluminium silicate |
| Chemical formula | Al2SiO5 |
| Mohs hardness | 4.5 along the blade, 6.5 to 7 across it |
| Crystal system | Triclinic |
| Chakra | Throat and Third Eye |
| Usually linked to | Aries and Taurus, and to Mercury |
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 4.5 along the blade, 6.5 to 7 across it, kyanite is soft enough to damage in a pocket with keys or in a bowl with other stones. Keep it separate.
Known in practice as one of the few stones said not to need cleansing, which is why it turns up in so many kits. Used for clearing a stuck conversation or a stuck decision.
In the shorthand most shops and books use, it is a Throat and Third Eye stone, and the three words attached to it most often are alignment, clear speech, cutting through.
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 kyanite will actually survive.
| Method | Safe? | Why |
|---|---|---|
| Water | Briefly | Brief contact only. Dry it straight away rather than leaving it to sit wet. |
| 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. |
Most kyanite is sold as rough blades rather than polished pieces, for the reason above. Bright, even teal usually means dyed quartzite.
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.
Kyanite is usually linked to Aries and Taurus, and to Mercury. 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.
Every piece of kyanite 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.
Briefly, and dry it immediately. It is not a stone to leave soaking or to rinse often.
No. Sunlight does not damage it.
Alignment, clear speech, cutting through. It is associated with the Throat and Third Eye chakra.
Mohs 4.5 along the blade, 6.5 to 7 across it. That is soft, so keep it away from keys, grit and harder stones.
Most kyanite is sold as rough blades rather than polished pieces, for the reason above.
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