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Julienite

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About JulieniteHide

Formula:
Na2[Co(SCN)4] · 8H2O
Colour:
Blue
Lustre:
Sub-Vitreous, Greasy, Silky
Specific Gravity:
1.648
Crystal System:
Monoclinic
Name:
Named in 1928 by Alfred Schoep in honor of a recently deceased Sorbonne University (Paris) Ph. D. student, Henri Julien [c. 1887 Clermont-Ferrand, Auvergne, France - December 1, 1920, Kambove, Katanga, Belgian Congo], who was a member of a geological survey mission in the Congo when he succumbed to poor health at the young age of 33. Julien had wanted to follow in his father's career as a geologist.
Sodium tetrathiocyanatocobaltate(II) octahydrate - a complex salt. Compare natrosulfatourea (that, however, lacks cobalt).

A very rare lath-like blue mineral occurring as crusts permeating matrix.

According to the state of art, julienite is the single mineral species containing the thiocyanate anion. Compare 'kafehydrocyanite'.


Classification of JulieniteHide

Approved, 'Grandfathered' (first described prior to 1959)
10.AD.05

10 : ORGANIC COMPOUNDS
A : Salts of organic acids
D : Cyanates
50.2.3.1

50 : ORGANIC COMPOUNDS
2 : Mellitates, Citrates, Cyanates, Acetates and Formates
30.1

30 : Thiocyanates

Physical Properties of JulieniteHide

Sub-Vitreous, Greasy, Silky
Transparency:
Transparent, Translucent
Colour:
Blue
Streak:
Blue.
Comment:
Hardness not determined.
Tenacity:
Brittle
Density:
1.648 g/cm3 (Measured)    1.61 g/cm3 (Calculated)

Optical Data of JulieniteHide

Type:
Uniaxial (+)
RI values:
nω = 1.556 nε = 1.645
Max Birefringence:
δ = 0.089
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of JulieniteHide

Formula:
Na2[Co(SCN)4] · 8H2O
IMA Formula:
Na2Co(SCN)4 · 8H2O

Crystallography of JulieniteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 18.941 Å, b = 19.209 Å, c = 5.460 Å
β = 91.64°
Ratio:
a:b:c = 0.986 : 1 : 0.284
Unit Cell V:
1,985.74 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals as minute needles, elongated [001], aggregated into crusts; acicular [001].
Twinning:
On {110} as the twin plane, or around [001].
Comment:
Pseudotetragonal. Space Group = P21/n, based on synthetic material.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0009760JulieniteMereiter K, Preisinger A (1982) The structure of sodium tetraisothiocyanatocobaltate(II) octahydrate Na2[Co(NCS)4]*8H2O Acta Crystallographica B38 1084-10881982synthetic0293
CIF Raw Data - click here to close

Type Occurrence of JulieniteHide

General Appearance of Type Material:
Blue incrustations
Geological Setting of Type Material:
White talc schist
Associated Minerals at Type Locality:

Other Language Names for JulieniteHide

German:Julienit
Simplified Chinese:硫氰钠钴石
Spanish:Julienita

Related Minerals - Nickel-Strunz GroupingHide

10.AD.10KafehydrocyaniteK4[Fe(CN)6] · H2OTet.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

30.2KafehydrocyaniteK4[Fe(CN)6] · H2OTet.

Other InformationHide

Notes:
Readily soluble in water, soluble in alcohol, yielding a pink solution.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for JulieniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Schoep, Alfred (1928) Over Julienit een nieuw mineral, Natuurwetenshappelijk Tijdschrift, Antwerp: 10: 58-59.
Foshag, W.F. (1932) American Mineralogist, 17, #10, 496.
Schoep, A. and V. Billiet (1935) Contribution à l’étude du réseau de la julienite [Na2Co(CSN)4 •8H2O]. Zeits. Krist., 91, 229–234 (in French).
Palache, Charles, Harry Berman & Clifford Frondel (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Seventh edition, Volume II: 1106-1107.
Mereiter, K. and A. Preisinger (1982) The structure of sodium tetraisothiocyanatocobaltate(II) octahydrate Na2[Co(NCS)4].8H2O. Acta Crystallographica (1982): B38: 1084-1088.
Pelkmans, Herwig (2013) Julienite. Henri Julien, http://www.mindat.org/article.php/1853/Julienite+-+Henri+Julien

Internet Links for JulieniteHide

Localities for JulieniteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
DR Congo (TL)
 
  • Haut-Katanga
    • Kambove District
      • Shinkolobwe
Schoep, A., Billiet, V. (1935) Contribution à l’étude du réseau de la julienite [Na2Co(CSN)4 •8H2O]. Zeitschrift für Kristallographie, 91(1-6), 229–234 (in French).; 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: 1106.; Mereiter, K., Preisinger, A. (1982) The structure of sodium tetraisothiocyanatocobaltate(II) octahydrate Na2[Co(NCS)4].8H2O. Acta Crystallographica, B38, 1084-1088.; Deliens, M. (1996) Overzicht van de mineralogie van de koper-, kobalt- en uraniumvoorkomens in Zuid-Shaba (Zaïre). Pages 35-49 in: Schatten der Aarde. Van mineraal tot juweel. Tentoonstelling in de abdij Saint-Gérard de Brogne van 27 april tot 27 oktober 1996. Catalogus opgemaakt onder de leiding van R. Warin, AGAB en P. Van hee, MKA (in Dutch).
 
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