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Melliniite

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About MelliniiteHide

Formula:
(Ni,Fe)4P
Lustre:
Metallic
Hardness:
8 - 8½
Specific Gravity:
7.882
Crystal System:
Isometric
Name:
Honouring Prof. Marcello Mellini, Mineralogist in the Universities of Perugia, Pisa and Siena, for his development of meteorite studies in Italy
This page provides mineralogical data about Melliniite.


Classification of MelliniiteHide

Approved
Approval Year:
2005
1.BD.20

1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
B : Metallic Carbides, Silicides, Nitrides and Phosphides
D : Phosphides
Dana 7th ed.:
1.1.31.4

Physical Properties of MelliniiteHide

Metallic
Transparency:
Opaque
Streak:
Grey
Hardness:
8 - 8½ on Mohs scale
Hardness:
VHN500=440 - 454 kg/mm2 - Vickers
Tenacity:
Brittle
Fracture:
Irregular/Uneven
Density:
7.882 g/cm3 (Measured)    7.88 g/cm3 (Calculated)

Optical Data of MelliniiteHide

Type:
Isotropic
Bireflectance:
No bireflectance
Reflectivity:
471.1nmR=60.56%
548.3nmR=50.44%
586.6nmR=52.51%
652.3nmR=55.94%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 60.56%.
Colour in reflected light:
Cream-yellowish
Internal Reflections:
None
Pleochroism:
Non-pleochroic

Chemical Properties of MelliniiteHide

Formula:
(Ni,Fe)4P

Crystallography of MelliniiteHide

Crystal System:
Isometric
Class (H-M):
2 3 - Tetartoidal
Space Group:
P21 3
Cell Parameters:
a = 6.025 Å
Unit Cell V:
218.71 ų
Z:
4

Type Occurrence of MelliniiteHide

General Appearance of Type Material:
anhedral to subhedral grains up to 100 µm across
Place of Conservation of Type Material:
Museum of Planetary Science, Prato, Italy (No. MSP2366)
Geological Setting of Type Material:
Primitive acapulcoite achondrite with low terrestrial weathering grade and shock stage
Associated Minerals at Type Locality:

Synonyms of MelliniiteHide

Other Language Names for MelliniiteHide

Related Minerals - Nickel-Strunz GroupingHide

1.BD.ZuktamruriteFeP2Orth. mmm (2/m 2/m 2/m) : Pnnm
1.BD.05Schreibersite(Fe,Ni)3PTet. 4 : I4
1.BD.05Nickelphosphide(Ni,Fe)3PTet.
1.BD.10Barringerite(Fe,Ni)2PHex. 6 m2 : P62m
1.BD.10MonipiteMoNiPHex. 6 m2 : P62m
1.BD.15FlorenskyiteFeTiPOrth.
1.BD.15Allabogdanite(Fe,Ni)2POrth. mmm (2/m 2/m 2/m) : Pnma
1.BD.15AndreyivanoviteFeCrPOrth. mmm (2/m 2/m 2/m) : Pnma

Other InformationHide

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 MelliniiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Moggi-Cecchi, V., Bindi, L., Pratesi, G. (2005): "A new iron-nickel phosphide from the Northwest Africa 1054 Meteorite", 68th Annual Meteoritical Society Meeting, 5308.
Pratesi, G., Bindi, L., Moggi-Cecchi, V. (2006): "Icosahedral coordination of phosphorus in the crystal structure of melliniite, a new phosphide mineral from the Northwest Africa (NWA) 1054 acapulcoite", American Mineralogist 91, 451-454.

Internet Links for MelliniiteHide

Localities for MelliniiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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.
Northwest Africa Meteorites
 
V. Moggi-Cecchi et al., 2005
V. Moggi-Cecchi et al., 2005
Russia
 
  • Chelyabinsk Oblast
    • Chelyabinsk coal basin
Sharygin, V. V., & Sokol, E. V. (2010). Metal-phosphide-sulfide association in paralavas from natural fires and burned waste dumps (Kuznetsk and Chelyabinsk coal basins, Russia). In Proceedings of «ICCFR2–Second International Conference on Coal Fire Research». Berlin, Germany (pp. 410-411).
Mineral and/or Locality  
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