KnowAgate
Chalcedony · Mohs 7
Banded chalcedony in almost every colour, traditionally the steadying stone that stops the swings.
- Chakra
- Root
- Element
- Earth
- Zodiac
- Gemini
- Care
- 💧 Water safe
Crystal database · Colour
Grey Crystals
Every grey stone in the database, with what it is made of and what it is traditionally used for.
Grey is the working colour: smoky quartz, hematite, howlite, the unglamorous end of the shelf. Grey stones are used to put a floor under a day rather than to lift it, and they are the ones most often carried rather than displayed. Their colour usually comes from iron or from natural irradiation, and unlike the bright colours it rarely fades.
6stones listed
2safe in water
2keep out of water
4with a full guide
Blue Tiger's Eye
Quartz
Also sold as hawk's eye. The same fibrous quartz as tiger's eye, but blue and much less pushy.
- Element
- Air
Hematite
Iron oxide · Mohs 5–6
Metallic grey and heavy in the hand, the most literal grounding stone on the shelf.
- Chakra
- Root
- Element
- Earth
- Care
- 💧 Keep dry
Labradorite
Feldspar · Mohs 6–6.5
Grey until the light hits it, then blue and gold. Tied to intuition and to change already underway.
- Element
- Air
- Zodiac
- Scorpio · Sagittarius
- Care
- 💧 Brief water only
Howlite
Borate · Mohs 3.5
Chalk-white with grey veining, and traditionally the patience stone.
Worth knowing: Dyed howlite is the most common turquoise substitute on the market. If a blue stone is cheap, evenly coloured and scratches easily, this is usually what it is.
- Chakra
- Crown
- Element
- Air
- Care
- 💧 Keep dry
No guide on site yet What it pairs with
Smoky Quartz
Quartz · Mohs 7
Brown-grey quartz used as a floor rather than a lift, for days when everything feels airborne.
- Chakra
- Root
- Element
- Earth
- Care
- 💧 Water safe
No guide on site yet What it pairs with
Why the colour matters
Colour is the fastest way into the correspondence system, because the chakra scheme is itself colour-coded, and most traditional associations follow the colour rather than the mineralogy. It is also the least reliable guide to how a stone must be treated: two stones of the same colour can be a hard silicate and a soft copper carbonate, and only one of them survives a rinse. Each card above carries its own verdict, and the safety checker has the full reasoning.
Other colour groups
Fact and tradition, kept apart
The mineral family, the Mohs hardness and the water verdict on each card are checkable physical fact, drawn from standard mineralogical and gemmological references. The chakra, element and purpose associations are tradition, published across the modern crystal-healing literature and offered here for reflection rather than as fact. Nothing on this page is medical advice. Browse the full database →