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
Blue Crystals
Every blue stone in the database, with what it is made of and what it is traditionally used for.
Blue is the throat colour, and the blue stones are almost all sold for saying the thing you have been avoiding: speaking calmly, speaking honestly, or simply speaking at all. Mineralogically the blues split into copper minerals (azurite, chrysocolla, turquoise), which are soft and often toxic, and hard silicates like aquamarine and blue tiger's eye. That split matters more than the shade does when you go to clean them.
20stones listed
2safe in water
6keep out of water
14with a full guide
⚠️ 2 of these are toxic minerals — Azurite, Chrysocolla. Keep them dry and polished, wash your hands after handling raw pieces, and never make a gem elixir from them. Full care verdicts →
Amazonite
Feldspar · Mohs 6–6.5
Blue-green feldspar traditionally used for saying no without a fight.
- Element
- Water
- Zodiac
- Virgo
- Care
- 💧 Brief water only
Apatite
Apatite · Mohs 5
Blue-green and tied to motivation with a plan behind it rather than a burst of enthusiasm.
- Element
- Air
- Care
- 💧 Brief water only
Aquamarine
Beryl · Mohs 7.5–8
Sea-blue beryl linked with saying the difficult thing calmly.
- Chakra
- Throat
- Element
- Water
- Care
- 💧 Water safe
Azurite
Copper carbonate · Mohs 3.5–4
Intense blue copper mineral linked with insight that arrives sideways.
- Chakra
- Third Eye
- Element
- Air
- Care
- 💧 Keep dry ⚠️ toxic
Blue Lace Agate
Quartz (chalcedony)
Pale blue banded agate, the gentlest of the throat stones and a common gift for anxious talkers.
Blue Obsidian
Volcanic glass
Translucent blue glass used for speaking plainly when the stakes are high.
Worth knowing: Natural blue obsidian is extremely rare. Almost all bright blue obsidian on the market is manufactured glass.
- Element
- Water
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
Celestite
Sulfate · Mohs 3–3.5
Pale sky-blue crystals, tied to a very quiet kind of stillness.
- Element
- Air
- Care
- 💧 Keep dry
Fluorite
Fluorite · Mohs 4
Banded purple, green and blue. The desk stone, associated with order and clear thinking.
- Element
- Air
- Care
- 💧 Brief water only
Iolite
Cordierite
Violet-blue and dramatically different from each angle, which is how Norse sailors are said to have used it.
Worth knowing: Iolite is strongly pleochroic: it shows blue, violet and near-colourless depending on the viewing angle. That is a real optical property, not a trick of the setting.
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
Larimar
Pectolite · Mohs 4.5–5
Caribbean blue pectolite, found only in the Dominican Republic, tied to the sense that it will pass.
- Chakra
- Throat
- Element
- Water
- Care
- 💧 Brief water only
Opalite
Glass
Milky and blue-glowing against the light, popular for transitions and for how it looks.
Worth knowing: Opalite is man-made opalescent glass. It is not opal, not moonstone and not a mineral, and honest sellers say so.
- Element
- Spirit
Angelite
Anhydrite · Mohs 3–3.5
Chalky blue anhydrite, associated with comfort and a sense of company.
- Element
- Air
- Care
- 💧 Keep dry
No guide on site yet What it pairs with
Chrysocolla
Copper silicate · Mohs 2.5–3.5
Blue-green copper silicate, the stone for a softer voice in a hard conversation.
- Element
- Water
- Care
- 💧 Keep dry ⚠️ toxic
No guide on site yet What it pairs with
Kyanite
Kyanite · Mohs 4.5–7
Blue blades, traditionally used to straighten the line between what you think and what you say.
- Element
- Air
- Care
- 💧 Brief water only
No guide on site yet What it pairs with
Lapis Lazuli
Rock (lazurite) · Mohs 5–5.5
Ultramarine flecked with pyrite, an ancient stone of wisdom and plain speech.
- Element
- Air
- Care
- 💧 Keep dry
No guide on site yet What it pairs with
Sodalite
Sodalite · Mohs 5.5–6
Deep blue veined with white, the stone of cool logic and honest self-assessment.
- Element
- Air
- Care
- 💧 Brief water only
No guide on site yet What it pairs with
Turquoise
Turquoise · Mohs 5–6
Sky blue to green, carried for thousands of years as a travelling and protection stone.
- Chakra
- Throat
- Element
- Air
- Care
- 💧 Keep dry
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 →