Entry № 066
Blue John Fluorite
Banded Calcium Fluoride
One hill in England, and nowhere else.
Chakra
Third Eye · Crown
Element
Water · Air
Zodiac
Pisces · Capricorn

I. The Metaphysical Reading
How the stone has been held.
Blue John is worked with as a stone of place and inheritance, particularly for practitioners with English ancestry, and as a quiet reminder that some resources are strictly finite. It is carried during work with lineage, land and the honest accounting of what a single family has taken from a single hill.
- Chakra
- Third Eye · Crown
- Element
- Water · Air
- Zodiac
- Pisces · Capricorn
- Keynote
- One hill in England, and nowhere else.
II. The Scientific Reading
What the lattice actually does.
Blue John is a banded variety of fluorite mined from only two hills near Castleton in Derbyshire, England: Blue John Cavern and Treak Cliff Cavern. Its distinctive purple-blue and yellow bands formed within limestone cavities by episodic precipitation from hydrothermal fluids in the Carboniferous. The stone has been carved into vases and ornaments since the eighteenth century, and current extraction is limited to a few tonnes per year to conserve the deposit.
- Formula
- CaF₂
- System
- Cubic (banded massive habit)
- Hardness
- 4 (Mohs)
- Provenance
- UK (Derbyshire - Castleton) as the sole global source
References & Sources
Independent mineralogical references used to verify the scientific details above.
Mineral Profile
Fact Sheet
- Chemical Formula
- CaF₂
- Crystal System
- Cubic (banded massive habit)
- Mohs Hardness
- 4 (Mohs)
- Density
- 3.13 g/cm³
- Refractive Index
- 1.432 – 1.434
- Provenance
- UK (Derbyshire - Castleton) as the sole global source
- Color Origin
- Alternating bands of deep purple, indigo blue and honey yellow
Related Crystals
Stones that share this lattice
Next in the Atlas
Blue Kyanite
Sapphire-blue blades that align a room.




