Entry № 099
Chiastolite
Andalusite with Graphite Cross
The cross stone of protection.
Chakra
Root · Third Eye
Element
Earth
Zodiac
Libra

I. The Metaphysical Reading
How the stone has been held.
Chiastolite is worked with as a stone of protection and passage, carried during travel, difficult conversations and the crossings between one chapter of life and the next. Practitioners hold it as a reminder that the symbol of the cross predates any single tradition and appears wherever pressure meets pattern.
- Chakra
- Root · Third Eye
- Element
- Earth
- Zodiac
- Libra
- Keynote
- The cross stone of protection.
II. The Scientific Reading
What the lattice actually does.
Chiastolite is a variety of andalusite (Al₂SiO₅) in which graphite impurities were pushed to the corners of the growing crystal during regional metamorphism, producing a distinctive dark cross visible in cross-section. Historically prized as a talisman across medieval Europe, it forms in low-pressure metamorphic aureoles around granite intrusions in schist and slate.
- Formula
- Al₂SiO₅ with graphite inclusions
- System
- Orthorhombic
- Hardness
- 6.5 – 7.5 (Mohs)
- Provenance
- China, Spain, Chile, Russia, Australia, USA (California)
References & Sources
Independent mineralogical references used to verify the scientific details above.
Mineral Profile
Fact Sheet
- Chemical Formula
- Al₂SiO₅ with graphite inclusions
- Crystal System
- Orthorhombic
- Mohs Hardness
- 6.5 – 7.5 (Mohs)
- Density
- 3.10 – 3.20 g/cm³
- Refractive Index
- 1.629 – 1.650
- Provenance
- China, Spain, Chile, Russia, Australia, USA (California)
- Color Origin
- Brown andalusite prisms with dark cross pattern in cross-section
Related Crystals
Stones that share this lattice
Next in the Atlas
Chinese Writing Stone
A stone that reads like a page.




