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|Lustre:||Silky||Hardness:||1 - 3|
|Name:||From the Greek κυανός for "blue" and θρίξ for "hair" in allusion to its colour and habit.|
A secondary copper mineral found sparsely in the oxidation zones of copper-bearing ore bodies.
Cyanotrichite is closely related to Carbonatecyanotrichite, from which it is impossible to distinguish without XRD measurements (tests for carbonate are not conclusive). Improved powder data are recently given by Hager et al. (2009) who suggest that there is no evidence for solid solution between cyanotrichite and carbonate-cyanotrichite; it is also evident that some carbonate-cyanotrichite specimens contain no sulfate.
The nomenclature situation is still complicated because the crystal structures of neither mineral is presently known.
See also Unnamed (Cyanotrichite-related mineral).
Visually similar to Khaidarkanite.
Classification of Cyanotrichite
|Strunz 8th edition ID:||6/D.08-20|
|Nickel-Strunz 10th (pending) edition ID:||7.DE.10|
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
E : With only medium-sized cations; unclassified
|Dana 8th edition ID:||18.104.22.168|
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
2 : (AB)6(XO4)Zq·xH2O
|Hey's CIM Ref.:||25.2.20|
25 : Sulphates
2 : Sulphates of Cu and Ag
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Type Occurrence of Cyanotrichite
|Type Locality:||Moldova Nouă (Neumoldowa), Moldova Nouă-Sasca Cu-Mo ore field, Banat Mts, Caraş-Severin Co., Romania|
|Year of Discovery:||1839|
Physical Properties of Cyanotrichite
|Hardness (Mohs):||1 - 3|
|Density (measured):||2.76 g/cm3|
|Comment:||A range from 2.737 (Morenci material) to 2.95 (Cap Garonne ?) exists in the literature.|
Crystallography of Cyanotrichite
|Cell Parameters:||a = 10.16Å, b = 12.61Å, c = 2.9Å|
|Ratio:||a:b:c = 0.806 : 1 : 0.23|
|Unit Cell Volume:||V 371.54 Å³ (Calculated from Unit Cell)|
|Morphology:||Occurs as velvet-, wool- or cotton-like aggregates and coatings comprised of minute acicular crystals; also radial-fibrous or tufted.|
|X-Ray Powder Diffraction:|
|Comments:||Grandview mine, Arizona, USA (ICDD-PDF no. 11–131)|
Optical Data of Cyanotrichite
|RI values:||nα = 1.588 nβ = 1.617 nγ = 1.655|
|2V:||Measured: 82° , Calculated: 86°|
|Maximum Birefringence:||δ = 0.067|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Comments:||X = ┴ laths = Nearly colourless|
Y = Light blue
Z = elongation = Bright blue
Chemical Properties of Cyanotrichite
|Simplified for copy/paste:||Cu4Al2(SO4)(OH)12·2H2O|
|Essential elements:||Al, Cu, H, O, S|
|All elements listed in formula:||Al, Cu, H, O, S|
Relationship of Cyanotrichite to other Species
|Structurally related to group(s):|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Cyanotrichite
|Other Information:||Soluble in acids.|
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Cyanotrichite
Werner (1808): 62 (as Kupfersammeterz and Kupfersamterz).
Jameson, R. (1816) A System of Mineralogy. second edition, 3 volumes: 3: 153 (as Velvet Copper Ore).
Breithaupt, A. (1823) Vollständige Characteristik etc. 1st. ed.: 168 (as Sammeterz).
Breithaupt, A. (1832) Vollständige Characteristik etc. 2nd. Ed.: 320 (as Sammeterz).
Glocker, E.F. (1839) Handbuch der Mineralogie, 2nd. edition, Nürnberg: 587 (as Cyanotrichit).
Percy (1850) Philosophical Magazine and Journal of Science: 36: 100 (as Lettsomite).
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 578-579.
Acta Univ. Carol., Prague, Geol. (1965): 149-155.
Gröbner, J. (1997): Mineralien der Cyanotrichit-Gruppe aus Fundorten in Österreich. - Mineralien-Welt 8 (3), 27-30.(in German)
Hager, S. L., Leverett, P. & Williams, P. A. (2009): Possible structural and chemical relationships in the cyanotrichite group. Canadian Mineralogist 47, 635-648.
Internet Links for Cyanotrichite
|Specimens:||The following Cyanotrichite specimens are currently listed for sale on minfind.com.|
Localities for Cyanotrichite
The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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New Locality Added: Great Trowlesworthy Tor, Plympton, Tavistock District, Devon, England, UKFrom Peter Haas, 29th Aug 2014 02:15:44