Devilline
A variety of Minerals
What is Devilline?
Devilline is a sulfate mineral with the chemical formula CaCu4(SO4)2(OH)6•3H2O. The name originates from the French chemist's name, Henri Etienne Sainte-Claire Deville (1818–1881). Devilline crystallizes in the monoclinic system. Crystallographically, it contains three vectors of unequal lengths and two pairs of vectors are perpendicular while the other pair makes an angle other than 90°. Devilline is prismatic and belongs to the crystal class 2/m. This mineral belongs to the space group P 21/c. Devilline is an anisotropic mineral, meaning that the mineral has different properties in different directions. Optically, this mineral is biaxial negative, meaning that it contains two optic axes. Devilline has a moderate mineral relief. Mineral relief refers to the way a mineral appears to stand out when viewed under polarized light and it is dependent on the mineral's index of refraction. Devilline is a rare and unusual secondary mineral found in the oxidized portions of copper sulfide ore deposits. Because Devilline occurs in such oxidation zones, this mineral often is of post-mining origin. Devilline is found in mines all around the world.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Devilline before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Devilline Localities Map
See where Devilline is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Green, bluish-green; green in transmitted light.
- Hardness (Mohs)
- 2.5
- Density
- 3.13 g/cm³
- Streak
- Light green
Chemical Properties
- Chemical Formula
- CaCu4(SO4)2(OH)6 · 3H2O
- Elements
- Ca, Cu, H, O, S
Also Known As
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Devilline FAQs
How do I identify Devilline?
Devilline can be identified by its hardness of 2.5 on the Mohs scale, Green color. Look for these key characteristics when examining specimens.
What color is Devilline?
Devilline typically appears in Green, bluish-green; green in transmitted light.. Color can vary depending on impurities and formation conditions.
How hard is Devilline?
Devilline has a hardness of 2.5 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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