Melliniite (original) (raw)
A valid IMA mineral species
About MelliniiteHide
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Name:
Honouring Prof. Marcello Mellini (b. 1949, Arcola (La Spezia), Italy), Mineralogist in the Universities of Perugia, Pisa and Siena, for his development of meteorite studies in Italy.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:28998:6
c23efa86-debb-4882-9037-a0d561e95842
IMA Classification of MelliniiteHide
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Classification of MelliniiteHide
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1.BD.20
1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
B : Metallic Carbides, Silicides, Nitrides, Phosphides and Hydrides
D : Phosphides
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Mli | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of MelliniiteHide
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Hardness:
VHN500=440 - 454 kg/mm2 - Vickers
Fracture:
Irregular/Uneven
Density:
7.882 g/cm3 (Measured) 7.88 g/cm3 (Calculated)
Optical Data of MelliniiteHide
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Bireflectance:
No bireflectance
Reflectivity:
| Wavelength | R |
|---|---|
| 471.1nm | 60.56% |
| 548.3nm | 50.44% |
| 586.6nm | 52.51% |
| 652.3nm | 55.94% |
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
Chemistry of MelliniiteHide
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Crystallography of MelliniiteHide
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Class (H-M):
23 - Tetartoidal
Cell Parameters:
a = 6.025 Å
Crystal StructureHide
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0004124 | Melliniite | 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 1054 acapulcoite American Mineralogist 91 451-454 |  |
2006 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.694 Å | (15) |
| 2.005 Å | (100) |
| 1.420 Å | (10) |
| 1.348 Å | (10) |
| 1.182 Å | (15) |
| 1.119 Å | (15) |
Comments:
Northwest Africa 1054 meteorite. Data from type description.
Geological EnvironmentHide
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Type Occurrence of MelliniiteHide
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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
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Other Language Names for MelliniiteHide
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Related Minerals - Strunz-mindat GroupingHide
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Other InformationHide
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Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for MelliniiteHide
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References for MelliniiteHide
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Localities for MelliniiteHide
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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
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