🔍 How to recognise it

To identify a Master Quartz Rainbow, look for this natural gesture in the stone:

• It shows flashes of rainbow colour when moved under light.
• These colours appear in specific internal areas, not across the whole piece.
• They always coincide with small internal fractures or planes in the crystal.
• The rest of the quartz remains clear or white, with no colour of its own.
• The effect changes intensity depending on the angle it's viewed from.

🌍 Mineralogical nature

What it actually is

The so-called "Master Quartz Rainbow" isn't a distinct species and contains no pigment at all: it's a clear quartz with small natural internal fractures, known in mineralogy as iris quartz.

How it forms

During its geological history, the crystal underwent small internal stresses that created flat micro-fractures inside it. These cracks never broke the crystal apart, but they did create thin layers of air trapped between the internal surfaces.

When white light passes through these microscopic layers, it splits into its component colours, just as it does in a soap bubble or a thin film of oil on water. This is an optical phenomenon known as thin-film interference: light separates into its full spectrum as it bounces between the two faces of the fracture.

• Internal micro-fractures formed by natural stresses within the crystal.
• Extremely thin layers of air trapped between those fractures.
• White light splitting into its colour spectrum as it passes through them.

In physical terms, it's the very same principle that explains a rainbow in the sky or the shimmer of a soap bubble: there's no pigment, just light separating into its colours as it passes through an extremely thin surface.

🧠 Psychological approach

On a mental level, this phenomenon is a reminder that a crack isn't necessarily a flaw: under the right light, it can become the very source of colour. It helps the brain associate difficult experiences with the possibility of turning them into something positive.

🕰 When it can be useful

• When you're looking for calmer, more positive mental states.
• When you need a reminder that difficulties can have a luminous side.
• When you want to cultivate more optimism in your everyday life.
• When you're seeking peace after a period of tension.

👉 It's valuable when you need to remember: "even my cracks can reflect light".

🧘 How to work with it

• Move it under natural light and watch how its colours shift.
• Hold it during moments when you're searching for mental calm.
• Keep it near a window so the light activates the effect every day.

👉 A key gesture: Turn it slowly until you find the exact angle where the colour appears. Peace also requires finding your own angle.

🔗 Correspondences

• Chakra: Crown (connection) and Heart (joy).
• Energy: Peace, optimism, mental relaxation.
• Other names: Iris Quartz / Rainbow Quartz.