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Hexaferrum

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About HexaferrumHide

Formula:
(Fe,Os,Ru,Ir)
Colour:
steel-gray with yellow tint
Lustre:
Metallic
Hardness:
6 - 7
Specific Gravity:
10.69 (Calculated)
Crystal System:
Hexagonal
Name:
Named for the crystal morphology, being in the HEXAgonal system, and its composition, containing essential iron (Latin = FERRUM).
Dimorph of:
The Fe analogue of garutiite, hexamolybdenum, osmium, and ruthenium. Said to represent a continuous solid solution, and Ir-, Os- and Ru-rich varieties are desribed.

It was defined by Mochalov et al. (1998) as a hexagonal close-packed (hcp) Fe mineral containing amounts of Ru, Os, or Ir. Cabri & Aiglsperger (2018) has re-examined hexaferrum together with a review of the phase chemistry in the Fe-Ni-Ir and Fe-Ru-Ir systems. They conclude that "the hcp (Fe,Ir) mineral correponds to the ε-phase of Raub et al. (1964) and should be differentiated from hexaferrum [(Fe,Os) and (Fe,Ru)] because it is separated by one to two miscibility gaps and therefore is not a continuous solid solution with Fe".


Classification of HexaferrumHide

Approved
Approval Year:
1995
1.AG.05

1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
A : Metals and Intermetallic Alloys
G : PGE-metal alloys
Dana 7th ed.:
1.1.17.6

Physical Properties of HexaferrumHide

Metallic
Transparency:
Opaque
Colour:
steel-gray with yellow tint
Hardness:
6 - 7 on Mohs scale
Hardness:
VHN100=629 - 679 - Vickers
Comment:
the above is VHN50 for Ru-variety; Os-variety: 741-880
Density:
10.69 g/cm3 (Calculated)

Optical Data of HexaferrumHide

Type:
Anisotropic
Anisotropism:
strong, blue-gray to muddy-brown yellow polarization colors (Ru variety); weak (Os & Ir variety)
Bireflectance:
not observed in Os- and Ir-rich variety
Reflectivity:
480nmR1=49.8%R2=41.9%
560nmR1=51.1%R2=42.0%
580nmR1=51.4%R2=42.0%
660nmR1=53.4%R2=43.0%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 53.4%.
R1 shown in black, R2 shown in red
Colour in reflected light:
light gray to white (Ru variety); white (Os variety); white to light gray (Ir variety)
Comments:
Reflectance for the Os-rich variety: 55.1 (480nm), 53.4 (560nm), 53.2 (580nm), 54.7 (660nm)

Chemical Properties of HexaferrumHide

Formula:
(Fe,Os,Ru,Ir)

Crystallography of HexaferrumHide

Crystal System:
Hexagonal
Class (H-M):
6/mmm (6/m 2/m 2/m) - Dihexagonal Dipyramidal
Space Group:
P63/mmc
Cell Parameters:
a = 2.64(1) Å, c = 4.20(2) Å
Ratio:
a:c = 1 : 1.591
Unit Cell V:
25.35 ų (Calculated from Unit Cell)
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.28/2.246/2.254 (50)
2.10/2.087/2.103 (60/60/70)
2.006/1.976/1.993 (100)
1.549/-/1.542 (30/-/40)
-/1.528/- (40)
1.316/1.297/1.304 (30/60/50)
1.195/1.180/1.192 (30/60/40)
-/1.100/1.110 (-/50/40)
-/1.083 (30)
Comments:
Ru/Os/Ir varieties; b - broad

Type Occurrence of HexaferrumHide

General Appearance of Type Material:
Cubic or octahedral crystals, up to 200 µm (usually 5–50 µm), as inclusions in Cr spinel
Place of Conservation of Type Material:
Mining Museum of Saint Petersburg Mining Institute, Russia
Geological Setting of Type Material:
dunite-harzburgite massif
Associated Minerals at Type Locality:

Synonyms of HexaferrumHide

Other Language Names for HexaferrumHide

Varieties of HexaferrumHide

Hexaferrum (Fe,Ir)A variety of Hexaferrum rich in Iridium
Hexaferrum (Fe,Os)A variety of Hexaferrum rich in Osmium.
Hexaferrum (Fe,Ru)A variety of Hexaferrum rich in Ru

Related Minerals - Nickel-Strunz GroupingHide

1.AG.05Garutiite(Ni,Fe,Ir)Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
1.AG.10Atokite(Pd,Pt)3SnIso. m3m (4/m 3 2/m) : Fm3m
1.AG.10Rustenburgite(Pt,Pd)3Sn
1.AG.10ZvyagintsevitePd3PbIso.
1.AG.15Taimyrite(Pd,Cu,Pt)3SnOrth.
1.AG.15Tatyanaite(Pt,Pd,Cu)9Cu3Sn4Orth.
1.AG.20PaolovitePd2SnOrth.
1.AG.25PlumbopalladinitePd3Pb2Hex.
1.AG.25Stannopalladinite(Pd,Cu)3Sn2Hex.
1.AG.30CabriitePd2CuSnOrth. mmm (2/m 2/m 2/m) : Pmmm
1.AG.35ChengdeiteIr3FeIso.
1.AG.35IsoferroplatinumPt3FeIso.
1.AG.40FerronickelplatinumPt2FeNiTet.
1.AG.40TetraferroplatinumPtFeTet.
1.AG.40TulameenitePt2CuFeTet.
1.AG.45HongshiitePtCuTrig.
1.AG.45SkaergaarditePdCuIso. m3m (4/m 3 2/m) : Pm3m
1.AG.50YixunitePt3InIso.
1.AG.55DamiaoitePtIn2Iso.
1.AG.60NiggliitePtSnHex.
1.AG.65BortnikovitePd4Cu3ZnTet. 4/mmm (4/m 2/m 2/m) : P4/mmm
1.AG.70NielsenitePdCu3Tet.

Other InformationHide

Notes:
magnetic
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 HexaferrumHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Mochalov, A.G., Dmitrenko, G.G., Rudashevsky, N.S., Zhernovsky, I.V., Boldyreva, M.M. (1998): Hexaferrum (Fe,Ru),(Fe,Os), (Fe,Ir) — a new mineral. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 127(5): 41-51; in: Jambor, J.L., Kovalenker, V.A,, Roberts, A.C. (1999): New mineral names. American Mineralogist: 84, 1685-1688
Cabri, L.J. & Aiglsperger, T. (2018): A review of hexaferrum based on new mineralogical data. Mineralogical Magazine, 82: 531-538.

Internet Links for HexaferrumHide

Localities for HexaferrumHide

ⓘ - 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.
Dominican Republic
 
  • Monseñor Nouel Province
    • Bonao
McDonald A M, Proenza J A, Zaccarini F, Rudashevsky N S, Cabri L J, Stanley C J, Rudashevsky V N, Melgarejo J C, Lewis J F, Longo F, Bakker R J (2010) Garutiite, (Ni,Fe,Ir), a new hexagonal polymorph of native Ni from Loma Peguera, Dominican Republic. European Journal of Mineralogy 22, 293-304
Russia (TL)
 
  • Kamchatka Krai
    • Koryak Mts
[ZVMO 127/5 (1998), 41; MinRec 31:201]
Mineral and/or Locality  
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