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| Formula: |
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| System: | Monoclinic | Colour: | Blue | |||||||||||||
| Name: | For the Belgian scientist Henri Julien (d. 1920), who discovered the mineral. | |||||||||||||||
Classification of Julienite | |||||||||||||||||
| IMA status: | Valid - first described prior to 1959 (pre-IMA) - "Grandfathered" | ||||||||||||||||
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| Strunz 8th edition ID: | 9/A.02-50 | ||||||||||||||||
| Nickel-Strunz 10th (pending) edition ID: | 10.AD.05 10 : ORGANIC COMPOUNDS A : Salts of organic acids D : Cyanates | ||||||||||||||||
| Dana 8th edition ID: | 50.2.3.1 50 : ORGANIC COMPOUNDS 2 : Mellitates, Citrates, Cyanates, Acetates and Formates | ||||||||||||||||
| Hey's CIM Ref.: | 30.1 30 : Thiocyanates | ||||||||||||||||
| mindat.org URL: | http://www.mindat.org/min-2121.html Please feel free to link to this page. | ||||||||||||||||
Type Occurrence of Julienite | |||||||||||||||||
| Type Locality: | Shamitumba (Chamibumba), Shinkolobwe, Central area, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of Congo (Zaïre) | ||||||||||||||||
| General Appearance of Type Material: | Blue incrustations | ||||||||||||||||
| Year of Discovery: | 1935 | ||||||||||||||||
| Geological Setting of type material: | White talc schist | ||||||||||||||||
| Associated Minerals at type locality: |
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Physical Properties of Julienite | |||||||||||||||||
| Diaphaneity (Transparency): | Translucent | ||||||||||||||||
| Colour: | Blue | ||||||||||||||||
| Streak: | Blue. | ||||||||||||||||
| Comment: | Hardness not determined. | ||||||||||||||||
| Density (measured): | 1.648 g/cm3 | ||||||||||||||||
| Density (calculated): | 1.61 g/cm3 | ||||||||||||||||
Crystallography of Julienite | |||||||||||||||||
| Crystal System: | Monoclinic | ||||||||||||||||
| Class (H-M): | 2/m - Prismatic | ||||||||||||||||
| Cell Parameters: | a = 18.941Å, b = 19.209Å, c = 5.460Å β = 91.64° | ||||||||||||||||
| Ratio: | a:b:c = 0.986 : 1 : 0.284 | ||||||||||||||||
| Unit Cell Volume: | 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. | ||||||||||||||||
Optical Data of Julienite | |||||||||||||||||
| Type: | Uniaxial (+) | ||||||||||||||||
| RI values: | nω = 1.556 nε = 1.645 | ||||||||||||||||
| Maximum Birefringence: | δ = 0.089 Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration. | ||||||||||||||||
| Surface Relief: | Moderate | ||||||||||||||||
Chemical Properties of Julienite | |||||||||||||||||
| Formula: |
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| Essential elements: | C, Co, H, N, Na, O, S | ||||||||||||||||
| All elements listed in formula: | C, Co, H, N, Na, O, S | ||||||||||||||||
Relationship of Julienite to other Species | |||||||||||||||||
| Related Minerals - Nickel-Strunz Grouping): - + |
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| Related Minerals - Hey's Index Grouping: - + |
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Other Names for Julienite | |||||||||||||||||
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Other Information | |||||||||||||||||
| Other Information: | Readily soluble in water, soluble in alcohol, yielding a pink solution. | ||||||||||||||||
| 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 Julienite | |||||||||||||||||
| Reference List: | Schoep, A. (1928) Natuurw. Tijdschr., Antwerp: 10: 58. 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. | ||||||||||||||||
Internet Links for Julienite | |||||||||||||||||
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Localities for Julienite | |||||||||||||||||
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