Entry № 091
Chalcanthite
Copper Sulphate Pentahydrate
The bright blue that must not touch water.
Chakra
Throat
Element
Water
Zodiac
Scorpio

I. The Metaphysical Reading
How the stone has been held.
Chalcanthite is a display stone kept sealed behind glass, worked with only through the eye. Practitioners hold it as a reminder that beauty and toxicity often share the same lattice, and that some stones are teachers precisely because they cannot be touched.
- Chakra
- Throat
- Element
- Water
- Zodiac
- Scorpio
- Keynote
- The bright blue that must not touch water.
II. The Scientific Reading
What the lattice actually does.
Chalcanthite is copper sulphate pentahydrate, water-soluble and highly toxic if handled or ingested. Natural crystals form as post-mining efflorescences in arid copper workings such as Chuquicamata in Chile and old mines in Arizona, and are unstable in humid air. Most large clusters on the market today are synthetic laboratory-grown from copper sulphate solution and clearly disclosed as such.
- Formula
- CuSO₄·5H₂O
- System
- Triclinic
- Hardness
- 2.5 (Mohs)
- Provenance
- Chile, USA (Arizona), Spain, Poland, Russia
References & Sources
Independent mineralogical references used to verify the scientific details above.
Mineral Profile
Fact Sheet
- Chemical Formula
- CuSO₄·5H₂O
- Crystal System
- Triclinic
- Mohs Hardness
- 2.5 (Mohs)
- Density
- 2.28 – 2.29 g/cm³
- Refractive Index
- 1.514 – 1.546
- Provenance
- Chile, USA (Arizona), Spain, Poland, Russia
- Color Origin
- Vivid sapphire-blue triclinic crystals with vitreous lustre
Related Crystals
Stones that share this lattice
Next in the Atlas
Chalcopyrite
Peacock ore — the stone of alchemists.




