Julienite
A valid IMA mineral species - grandfathered
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About Julienite
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'.
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'.
Unique Identifiers
Mindat ID:
2121
Long-form identifier:
mindat:1:1:2121:6
GUID
(UUID V4):
(UUID V4):
dab27c41-56e2-4764-be5d-57e1cb8b49cd
IMA Classification of Julienite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Na2Co(SCN)4 · 8H2O
First published:
1928
Classification of Julienite
10.AD.05
10 : ORGANIC COMPOUNDS
A : Salts of organic acids
D : Cyanates
10 : ORGANIC COMPOUNDS
A : Salts of organic acids
D : Cyanates
50.2.3.1
50 : ORGANIC COMPOUNDS
2 : Mellitates, Citrates, Cyanates, Acetates and Formates
50 : ORGANIC COMPOUNDS
2 : Mellitates, Citrates, Cyanates, Acetates and Formates
30.1
30 : Thiocyanates
30 : Thiocyanates
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Jln | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Julienite
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 Julienite
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.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Optical Extinction:
Parallel.
Chemistry of Julienite
Mindat Formula:
Na2[Co(SCN)4] · 8H2O
Crystallography of Julienite
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°
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 Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0009760 | Julienite | Mereiter K, Preisinger A (1982) The structure of sodium tetraisothiocyanatocobaltate(II) octahydrate Na2[Co(NCS)4]*8H2O Acta Crystallographica B38 1084-1088 | 1982 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
0.935 Å | (100) |
0.903 Å | (100) |
3.55 Å | (85) |
3.23 Å | (85) |
1.375 Å | (85) |
1.220 Å | (85) |
6.50 Å | (58) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
50 : Coal and/or oil shale minerals | <0.36 |
Type Occurrence of Julienite
General Appearance of Type Material:
Blue incrustations.
Place of Conservation of Type Material:
Ecole Nationale Supérieure des Mines, Paris, France, number 5082.
Geological Setting of Type Material:
White talc schist.
Associated Minerals at Type Locality:
Other Language Names for Julienite
Related Minerals - Strunz-mindat Grouping
10.AD.10 | Kafehydrocyanite | K4[Fe(CN)6] · H2O |
Other Information
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.
Internet Links for Julienite
mindat.org URL:
https://www.mindat.org/min-2121.html
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Please feel free to link to this page.
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References for Julienite
Reference List:
Localities for Julienite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
DR Congo (TL) | |
| Schoep et al. (1935) +3 other references |
Quick NavTopAbout JulieniteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence Other LanguagesStrunz-MindatOther InformationInternet Links References Localities Locality List
Shamitumba, Shinkolobwe, Kambove Territory, Haut-Katanga, DR Congo