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Entry № 091

Chalcanthite

Copper Sulphate Pentahydrate

The bright blue that must not touch water.

Chakra

Throat

Element

Water

Zodiac

Scorpio

Chalcanthite

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

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Next in the Atlas

Chalcopyrite

Peacock ore — the stone of alchemists.