Crystals
Amethyst is quartz, Mohs 7, used for calm, sleep, clear thinking. 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. Amethyst is quartz. On colour: Iron impurities that have been altered by natural radiation deep in the rock. Heat the same stone and the purple turns yellow, which is how most commercial citrine is made.
Where it comes from: Brazil, Uruguay, Zambia and Bolivia. The Uruguayan material is the deep end of the colour range.
| Property | Value |
|---|---|
| Mineral species | Quartz |
| Chemical formula | SiO2 |
| Mohs hardness | 7 |
| Crystal system | Trigonal |
| Chakra | Third Eye and Crown |
| Usually linked to | Pisces and Aquarius, and to Jupiter |
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 7, amethyst is hard enough to handle daily wear without much trouble, though it will still scratch a softer stone it is stored against.
Amethyst is the stone people reach for when the problem is a mind that will not stop. It is the most common choice for bedside tables and for anybody trying to stop something: the Greek name means roughly not drunk, and the stone was carried against intoxication for most of two thousand years.
In the shorthand most shops and books use, it is a Third Eye and Crown stone, and the three words attached to it most often are calm, sleep, clear thinking.
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 amethyst will actually survive.
| Method | Safe? | Why |
|---|---|---|
| Water | Yes | Safe in water. Quartz family stones are hard, non-porous and chemically stable, so a rinse does no harm. |
| Direct sunlight | No | Fades in direct sunlight. The colour loss is permanent and it is faster than most people expect: a sunny windowsill will visibly pale a piece within a season. |
| Salt or salt water | With care | Dry salt is tolerable, though it scratches a polish over time and there is no particular reason to use it. |
| 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. |
Much of the cheap deep purple on the market is heat-treated or dyed, and some of it is synthetic quartz grown in a factory, which is chemically identical and worth a fraction. Colour that is perfectly even end to end is the tell: natural amethyst is almost always zoned, with the colour stronger at the tip.
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.
Amethyst is usually linked to Pisces and Aquarius, and to Jupiter. 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 Pisces sets out what that sign actually describes, and it is calculated from a date rather than assigned by a writer.
Every piece of amethyst 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.
Yes. At Mohs 7 it is hard and chemically stable, so water does no harm.
Yes, and permanently. Keep it off sunny windowsills. The colour will not come back.
Calm, sleep, clear thinking. It is associated with the Third Eye and Crown chakra.
Mohs 7. That is hard enough for daily handling.
Much of the cheap deep purple on the market is heat-treated or dyed, and some of it is synthetic quartz grown in a factory, which is chemically identical and worth a fraction.
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