Mineralogy Database

Melliniite Mineral Data

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General Melliniite Information

Help on Chemical  Formula: Chemical Formula: (Ni,Fe)4P
Help on Composition: Composition: Molecular Weight = 259.69 gm
   Iron        35.27 %  Fe
   Cobalt       0.23 %  Co
   Nickel      51.98 %  Ni
   Phosphorus  12.52 %  P
              100.00 % 
Help on Empirical Formula: Empirical Formula: Ni2.3Fe2+1.64Co0.01P1.05
Help on Environment: Environment: Found in an acapulcoite, a primitive achondrite meteorite. New structure type.
Help on IMA Status: IMA Status: Approved IMA 2005 (Dana # Added)
Help on Locality: Locality: Acapulcoite achondrite �Northwest Africa 1054�. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named in honor of Marcello Mellini, Full Professor of Mineralogy at the University of Siena, in recognition of his contributions to the development of the study of meteorites in Ita ly.
Help on Synonym: Synonym: IMA2005-027

Melliniite Image

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  Melliniite   Kamacite

Comments: Reflected-light image displaying an anhedral fragment of creamy-yellowish melliniite(1) associated with kamacite (2). AmMin, v91, p453.
Location: Northwest Africa 1054 acapulcoite. Scale: See Image.
© American Mineralogist

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  Melliniite   Nickelphosphide

Comments: Reflected light image of creamy-yellowish melliniite (1) and nickelphosphide (3). AmMin, v91, p453.
Location: Northwest Africa 1054 acapulcoite. Scale: See Image.
© American Mineralogist

Melliniite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 6.025, Z = 4; V = 218.71 Den(Calc)= 7.89
Help on Crystal System: Crystal System: Isometric - Tetartoidal H-M Symbol (2 3) Space Group: P 213
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.005(1), 1.906(0.6), 1.816(0.2),1.119(0.15), 1.182(0.15), 2.694(0.15), 1.348(0.1), 1.42(0.1),

Physical Properties of Melliniite

Help on Color: Color: Creamy yellow.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Hardness: Hardness: 8-8.5 - Between Topaz and Chrysoberyl
Help on Luster: Luster: Metallic
Help on Streak: Streak: gray

Optical Properties of Melliniite

Help on RL Anisotrophism: RL Anisotrophism: None.
Help on RL Bireflectance: RL Bireflectance: None.
Help on RL Color: RL Color: Cream yellowish with no internal reflections.
Help on RL Pleochroism: RL Pleochroism: None.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Melliniite in Air
λ R  ∑ R(λ) 
 470 nm   60.50   
 548 nm   50.40 
 587 nm   52.50 
 650 nm   55.90 
Calculated Relative Intensity Colors of Melliniite in Air
   0%   20%   40%   60%   80% 100% 120% 140% 160% 170%

Calculated Properties of Melliniite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=7.48 gm/cc
note: Specific Gravity of Melliniite =7.89 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEMelliniite = 32.59 barns/electron
U=PEMelliniite x rElectron Density= 243.68 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Melliniite is Not Radioactive

Melliniite Classification

Help on  Dana Class: Dana Class: (01)Native Elements
  (01.01)with metallic elements other than the platinum group
  (01.01.21)Barringerite Group phosphides Barringerite (Fe,Ni)2P P 62m 6 m2 Schreibersite (Fe,Ni)3P I 4 4 Nickelphosphide! (Ni,Fe)3P I 4 4 Allabogdanite! (Fe,Ni)2P P nma 2/m 2/m 2/m Melliniite! (Ni,Fe)4P P 213 2 3 Monipite! MoNiP P 6 2m 6 m2
Help on  Strunz Class: Strunz Class: 01.BD.20 01 - ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
  01.B - Metallic Carbides, Silicides, Nitrides and Phosphides
  01.BD -Phosphides
01.BD.20 Melliniite! (Ni,Fe)4P P 213 2 3

Other Melliniite Information

Help on References: References: NAME( AmMin, v91, p 451) PHYS. PROP.(AmMin, v91, p 451) OPTIC PROP.(AmMin, v91, p 451)
Help on See Also: See Also: Links to other databases for Melliniite :
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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Dana No: Strunz No: 01.BD.20





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