mineral
Chalcanthite
Copper(II) sulfate pentahydrate (CuSO4·5H2O)
Hardness: 2.5 on Mohs scale; Color: Brilliant deep blue; Luster: Vitreous; Crystal Structure: Triclinic; Cleavage: Imperfect; Specific Gravity: 2.1–2.3. Note: Water soluble and toxic.
- Hardness
- 2
- Color
- Brilliant deep blue
- Luster
- Vitreous
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Physical properties
Hardness: 2.5 on Mohs scale; Color: Brilliant deep blue; Luster: Vitreous; Crystal Structure: Triclinic; Cleavage: Imperfect; Specific Gravity: 2.1–2.3. Note: Water soluble and toxic.
Formation & geological history
Formed in the oxidation zones of copper sulfide ore deposits. It is often a secondary mineral that crystallizes from sulfate-rich waters in mines.
Uses & applications
Commonly used as a copper ore in some regions, though primarily valued as a striking collector's specimen. Synthetically grown for chemical industry uses.
Geological facts
Naturally occurring chalcanthite is rare because it is highly water-soluble; specimens found in shops are often lab-grown crystals. It is toxic if ingested and should be handled with care.
Field identification & locations
Identified by its distinctive 'electric' blue color and rapid dissolution in water. In the field, look for it in arid copper mine environments or on mine walls (stalactites). Keep dry.
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Epidote
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Gypsum (variety Selenite or Alabaster)
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