Entry № 294
Nontronite
Iron-rich smectite clay
Ochre clay of quiet transformation.
Chakra
Root · Solar Plexus
Element
Earth
Zodiac
Virgo · Capricorn

I. The Metaphysical Reading
How the stone has been held.
Nontronite is worked with as a stone of slow, patient renewal. Its earthy tone is said to support the humble, unglamorous work of change — decluttering, weeding, digesting — rather than dramatic breakthroughs.
- Chakra
- Root · Solar Plexus
- Element
- Earth
- Zodiac
- Virgo · Capricorn
- Keynote
- Ochre clay of quiet transformation.
II. The Scientific Reading
What the lattice actually does.
Nontronite is an iron-rich member of the smectite clay group, formed by the weathering and hydrothermal alteration of iron-bearing volcanic rocks. It is named after the town of Nontron in France where it was first described, and it plays a significant role in soil geochemistry and on Mars.
- Formula
- Na₀.₃Fe₂((Si,Al)₄O₁₀)(OH)₂·nH₂O
- System
- Monoclinic
- Hardness
- 1.5 – 2.5 (Mohs)
- Provenance
- France (Nontron), USA, Australia
References & Sources
Independent mineralogical references used to verify the scientific details above.
Mineral Profile
Fact Sheet
- Chemical Formula
- Na₀.₃Fe₂((Si,Al)₄O₁₀)(OH)₂·nH₂O
- Crystal System
- Monoclinic
- Mohs Hardness
- 1.5 – 2.5 (Mohs)
- Density
- 2.20 – 2.30 g/cm³
- Refractive Index
- 1.560 – 1.620
- Provenance
- France (Nontron), USA, Australia
- Color Origin
- Olive to yellow-green and yellow-brown from iron
Related Crystals
Stones that share this lattice
Next in the Atlas
Noreena Jasper
Ochre-and-brick banding of the ancient outback.




