Julienite Mineral Data

Julienite Mineral Data +

General Julienite Information

Chemical Formula:

Na2Co++(SCN)4·8(H2O)

Composition:

Molecular Weight = 481.37 gm

Sodium 9.55 % Na

Cobalt 12.24 % Co

Hydrogen 3.35 % H

Carbon 9.98 % C

Sulfur 26.65 % S

Nitrogen 11.64 % N

Oxygen 26.59 % O

______

100.00 %

Empirical Formula:

Na₂Co(SCN)₄·8(H₂O)

Environment:

Cobaltian wad in a white talc schist.

IMA Status:

Not Approved (Pre-IMA) 1928

Locality:

Chamitumba, near Kambove, Shaba, Zaire. Link to MinDat.org Location Data.

Name Origin:

Named for Henri Julien (-1920), Belgian scientist.

Synonym:

ICSD 16830

PDF 2-372

Sodium colbalt thiocyanate

Julienite Image

Images:

Julienite

Comments: Bright blue nearly opaque prismatic micro crystal of julienite.
Location: Chamibumba, near Kambove, Katanga, Shaba, Zaire. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Julienite Crystallography

Axial Ratios:

a:c = 1:0.60281

Cell Dimensions:

a = 9.24, c = 5.57, Z = 1; V = 475.55 Den(Calc)= 1.68

Crystal System:

Tetragonal - DipyramidalH-M Symbol (4/m) Space Group: P 4₁/n

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 1.375(1), 3.23(1), 3.55(1),

Physical Properties of Julienite

Cleavage:

[001] Good

Color:

Blue.

Density:

1.648

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Optical Properties of Julienite

Optical Data:

Uniaxial (+), w=1.556, e=1.645, bire=0.0890.

Calculated Properties of Julienite

Electron Density:

r_electron=1.71 gm/cc
note: r_Julienite=1.68 gm/cc.

Fermion Index

Fermion Index = 0.11918
Boson Index = 0.88082

Photoelectric:

PE_Julienite= 5.62 barns/electron
U=PE_Julienite x r_electron= 9.61 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Julienite is Not Radioactive

Julienite Classification

Dana Class:

50.2.3.1 (50)Salts of Organic Acids

(50.2)(Mellitates, Citrates, Cyanates, and Acetates)

(50.2.3)Dana Group

50.2.3.1 Julienite * Na2Co(SCN)4·8(H2O) P 4₁/n 4/m

Strunz Class:

IX/A.02-50 IX - Organic compunds

IX/A - Salts from organic acids. Other organic salts, a.o. mellates and citrates.

IX/A.02 - Mellite - Abelsonite (?) series

IX/A.02-03 Dashkovaite! Mg(HCOO)2·2(H2O) P 2₁/c 2/m

IX/A.02-05 Formicaite! Ca(HCOO)2 P 4₁2₁2 4 2 2

IX/A.02-10 Mellite Al2[C6(COO)6]·16(H2O) P 4₁22,P 4₃22 4 2 2

IX/A.02-16 Hoganite! Cu(CH3COO)2·H2O C 2/c 2/m

IX/A.02-18 Paceite! CaCu(CH3COO)4·6(H2O) I 4/m 4/m

IX/A.02-20 Calclacite Ca[Cl2/CH3COO]·10(H2O) P 2₁/a 2/m

IX/A.02-30 Earlandite Ca3(C6H5O7)·4(H2O) Unk Mono

IX/A.02-40 Kafehydrocyanite* K4Fe(CN)6·3(H2O) I 4₁/a 4/m

IX/A.02-50 Julienite Na2Co(SCN)4·8(H2O) P 4₁/n 4/m

IX/A.02-60 Abelsonite NiC31H32N4 P1 or P1 Tri

Other Julienite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Julienite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Print or Cut-and-Paste your Julienite Specimen Label here :

Julienite

Na2Co++(SCN)4·8(H2O)
Dana No: 50.2.3.1 Strunz No: IX/A.02-50
Locality:

Notes: