Devilline

Short description: Sulfate mineral

Devilline

Devilline

General
Category| Sulfate minerals
Formula
(repeating unit)| CaCu4(SO4)2(OH)6·3(H2O)
Strunz classification| 7.DD.30
Crystal system| Monoclinic
Crystal class| Prismatic (2/m)
(same H-M symbol)
Space group| P21/c
Unit cell| a = 20.870, b = 6.135
c = 22.91 [Å], β = 102.73°
V = 2,861.23 Å3
Identification
Color| Green, blueish green; green in transmitted light
Crystal habit| Prismatic, lamellar, platy pseudohexagonal crystals
Twinning| On {010}
Cleavage| Perfect (001) distinct (110) and (101)
Tenacity| Brittle
Mohs scale hardness| 2.5
|re|er}}| Vitreous, pearly
Streak| Light green
Density| Measured: 3.13 g/cm3 Calculated: 3.084 g/cm3
Optical properties| biaxial negative
Refractive index| nα=1.585, nβ=1.649, nγ=1.660
Birefringence| δ=0.075
Pleochroism| Visible
2V angle| 42°
Solubility| Insoluble in water and concentrated H2SO4. Completely soluble in HNO3.
References| [1][2]

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.[4] 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.[5] Because Devilline occurs in such oxidation zones, this mineral often is of post-mining origin. Devilline is found in mines all around the world.

## Devilline group

Devilline group minerals are monoclinic sulfates.[6]

Mineral | Chemical formulae | Crystal system

|
|

Campigliaite | Cu4Mn2+(SO4)2(OH)6·4H2O | Monoclinic
Devilline | CaCu4(SO4)2(OH)6·3H2O | Monoclinic
Kobyashevite | Cu5(SO4)2(OH)6·4H2O | Triclinic
Ktenasite | Zn(Cu,Zn)4(SO4)2(OH)6·6H2O | Monoclinic
Lautenthalite | PbCu4(SO4)2(OH)6·3H2O | Monoclinic
Serpierite | Ca(Cu,Zn)4(SO4)2(OH)6·3H2O | Monoclinic

## References

1. ↑ "Devilline on Mindat". http://www.mindat.org/min-1270.html.
2. ↑ "Devilline Mineral Data – Webmineral". http://webmineral.com/data/Devilline.shtml.
3. ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W. https://www.cambridge.org/core/journals/mineralogical-magazine/article/imacnmnc-approved-mineral-symbols/62311F45ED37831D78603C6E6B25EE0A.
4. ↑ Back, M., and Mandrine, J. (2008) Fleischer's Glossary of Mineral Species 2008. 58 p. Mineralogical Record, Tuscan, Arizona
5. ↑ Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C. (2005). "Devilline". Mineral Data Publishing. http://www.handbookofmineralogy.org/pdfs/devilline.pdf.
6. ↑ Back, Malcolm E. (2014). Fleischer's Glossary of Mineral Species (11 ed.). Tucson AZ: Mineralogical Record Inc.. pp. 434.

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