Hexaferrum Mineral Data

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General Hexaferrum Information

Chemical Formula:

(Fe,Os,Ru,Ir)

Composition:

Molecular Weight = 86.51 gm

Iron 41.96 % Fe

Iridium 31.11 % Ir

Osmium 17.59 % Os

Ruthenium 9.35 % Ru

______

100.00 %

Empirical Formula:

Fe⁰⁺_0.65Ir_0.14Os_0.08Ru_0.08

Environment:

Found in chromite segregations in dunite.

IMA Status:

Approved IMA 1995 (Dana # Added)

Locality:

The Chirynaisky massif, Koryak Mountains, Kamchatka, Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the symmetry and composition.

Synonym:

IMA1995-032

Hexaferrum Image

Images:

Hexaferrum

Comments: Polished section showing a white euhedral crystal of hexaferrum in gray chromite.
Location: Pole Corral Pass, Rattlesnake Creek Terrane, Beegum, California, USA. Scale: Picture size 14 mm.
© Thomas Witzke

Hexaferrum Crystallography

Axial Ratios:

a:c = 1:1.60864

Cell Dimensions:

a = 2.591, c = 4.168, Z = 2; V = 24.23 Den(Calc)= 11.86

Crystal System:

Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6₃/mmc

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

By Intensity(I/I_o): 1.976(1), 1.297(0.6), 2.087(0.6),

Physical Properties of Hexaferrum

Cleavage:

None

Color:

Yellowish steel gray.

Diaphaneity:

Opaque

Habit:

Inclusions - Generally found as inclusions in other minerals.

Habit:

Pseudo Cubic - Crystals show a cubic outline.

Hardness:

6-7 - Orthoclase-Quartz

Luster:

Metallic

Streak:

black

Optical Properties of Hexaferrum

RL Anisotrophism:

Weak.

RL Bireflectance:

None.

RL Color:

White.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Hexaferrum in Air**
λ	R	∑ R(λ)
480 nm	55.10
560 nm	53.40
580 nm	53.20
660 nm	54.70

**Calculated Relative Intensity Colors of Hexaferrum in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	170%
R

Calculated Properties of Hexaferrum

Electron Density:

Bulk Density (Electron Density)=10.2 gm/cc
note: Specific Gravity of Hexaferrum =11.9 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_Hexaferrum= 721.29 barns/electron
U=PE_Hexaferrum x rElectron Density=7,372.56 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hexaferrum is Not Radioactive

Hexaferrum Classification

Dana Class:

01.02.02.04 (01)Native Elements

(01.02)with platinum group metals and alloys

(01.02.02)Osmium group (Space Group P63/mmc)

01.02.02.01 Osmium (Os,Ir) P 6₃/mmc 6/m 2/m 2/m

01.02.02.02 Ruthenium (Ru,Ir,Os) P 6₃/mmc 6/m 2/m 2/m

01.02.02.03 Rutheniridosmine (Ir,Os,Ru) P 6₃/mmc 6/m 2/m 2/m

01.02.02.04 Hexaferrum! (Fe,Os,Ru,Ir) P 6₃/mmc 6/m 2/m 2/m

01.02.02.05 Hexamolybdenum! (Mo,Ru,Fe,Ir,Os) P 6₃/mmc 6/m 2/m 2/m

01.02.02.06 IMA2008-055! (Ni,Fe,Ir) P 6₃/mmc 6/m 2/m 2/m

Strunz Class:

01.AG.05 01 - ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)

01.A - Metals and Intermetallic Alloys

01.AG -PGE-metal alloys

01.AG.05 Hexaferrum! (Fe,Os,Ru,Ir) P 6₃/mmc 6/m 2/m 2/m

01.AG.05 IMA2008-055! (Ni,Fe,Ir) P 6₃/mmc 6/m 2/m 2/m

Other Hexaferrum Information

References:

NAME( MinRec, V. 31, No. 2) PHYS. PROP.(MinRec, V 31, No. 2) OPTIC PROP.(AmMin,v 84, p 1686)

See Also:

Links to other databases for Hexaferrum :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Ask about Hexaferrum here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Print or Cut-and-Paste your Hexaferrum Specimen Label here :

Hexaferrum

(Fe,Os,Ru,Ir)
Dana No: 01.02.02.04 Strunz No: 01.AG.05
Locality:

Notes: