Miguelromeroite (original) (raw)
A valid IMA mineral species
About MiguelromeroiteHide
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Formula:
MnMn2Mn2(AsO4)2(HAsO4)2 · 4H2O
Crystal System:
Monoclinic
Name:
Named in 2009 by Anthony Robert Kampf in honor of Miguel Romero Sanchez [1926 Oaxaca, Mexico - January 8, 1997 Tehuacán, Pueblo, Mexico], chemist, agribusiness leader, politician, and philanthropist. The Miguel Romero Award is hosted by the Tucson Gem and Mineral Society.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:39333:1
92bb803a-d5be-44f2-9238-efee5a77deaa
IMA Classification of MiguelromeroiteHide
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IMA Formula:
Mn5(AsO3OH)2(AsO4)2(H2O)4
Classification of MiguelromeroiteHide
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8.CB.10
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
B : With only medium-sized cations, RO4:H2O = 1:1
39.2.1.4
39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
2 : (AB)5[HXO4]2[XO4]2.xH2O
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 |
|---|---|---|
| Mig | 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 MiguelromeroiteHide
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Cleavage:
Distinct/Good
on {100}
Density:
3.69(3) g/cm3 (Measured) 3.714 g/cm3 (Calculated)
Comment:
Measured with a Berman balance. Calculated value is based on empirical formula.
Optical Data of MiguelromeroiteHide
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RI values:
_n_α = 1.713(2) _n_β = 1.723(2) _n_γ = 1.729(2)
2V:
Measured: 70° (5), Calculated: 75°
δ = 0.016
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Optical Extinction:
X = b, Z ∧ c = 40° in obtuse β.
Comments:
Shades of pale pink.
Comments:
Absorption: Z >> X > Y.
Chemistry of MiguelromeroiteHide
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Mindat Formula:
MnMn2Mn2(AsO4)2(HAsO4)2 · 4H2O
Crystallography of MiguelromeroiteHide
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Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 18.0300(10) Å, b = 9.2715(5) Å, c = 9.7756(5) Å
β = 96.266(2)°
Ratio:
a:b:c = 1.945 : 1 : 1.054
Unit Cell V:
1,624.38 ų (Calculated from Unit Cell)
Morphology:
Crystals are elongate on [001] and exhibit the forms {100}, {110}, and {101}.
Crystal StructureHide
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0001199 | Miguelromeroite | Kampf A R, Ross C R (1988) End-member villyaellenite from Mapimi, Durango, Mexico: Descriptive mineralogy, crystal structure, and implications for the ordering of Mn and Ca in type villyaellenite results in a name change for this structure refinement American Mineralogist 73 1172-1178 |  |
1988 | Mapimi, Durango, Mexico | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.279 Å | (28) |
| 3.357 Å | (33) |
| 3.234 Å | (100) |
| 3.074 Å | (68) |
| 2.973 Å | (39) |
| 2.676 Å | (21) |
| 2.341 Å | (21) |
| 1.680 Å | (26) |
Geological EnvironmentHide
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Type Occurrence of MiguelromeroiteHide
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General Appearance of Type Material:
A compact spray of orange-pink, prismatic crystals up to 4 cm in length (Ojuela mine). Transparent orange-pink crystals in flattened, circular, radial (7 mm diameter) aggregates (Stirling Hill). Sprays and divergent aggregates of transparent pink prisms to several millimeters in length (Veta Negra mine).
Place of Conservation of Type Material:
The holotype is deposited in the Natural History Museum of Los Angeles County, Los Angeles, California, USA (catalog number: 25414).
Geological Setting of Type Material:
Secondary oxidation zone assemblage.
Associated Minerals at Type Locality:
Synonyms of MiguelromeroiteHide
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Other Language Names for MiguelromeroiteHide
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Relationship of Miguelromeroite to other SpeciesHide
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Other Members of this group:
| Chongite | Ca3Mg2(AsO4)2(AsO3OH)2 · 4H2O | Mon. 2/m : _B_2/b |
|---|---|---|
| Giftgrubeite | CaMn2Ca2(AsO4)2(AsO3OH)2 · 4H2O | Mon. 2/m : _B_2/b |
| Hureaulite | Mn2+5(PO3OH)2(PO4)2 · 4H2O | Mon. 2/m : _B_2/b |
| Nyholmite | Cd3Zn2(AsO4)2(HAsO4)2 · 4H2O | Mon. 2/m : _B_2/b |
| Sainfeldite | Ca5(AsO4)2(AsO3OH)2 · 4H2O | Mon. 2/m : _B_2/b |
| Villyaellenite | MnMn2Ca2(AsO4)2(HAsO4)2 · 4H2O | Mon. 2/m : _B_2/b |
Common AssociatesHide
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Associated Minerals Based on Photo Data:
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 MiguelromeroiteHide
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References for MiguelromeroiteHide
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Localities for MiguelromeroiteHide
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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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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
| Chile | |
|---|---|
| Atacama Copiapó Province Tierra Amarilla Pampa Larga mining district ⓘ Jote Mine | samples analysed by Jochen Schlüter |
| ⓘ Veta Negra Mine |
Kampf (2009) |
| Japan | |
| Fukushima Prefecture Iwaki City ⓘ Gozaisho Mine | Kampf (2009) |
| Mexico (TL) | |
| Durango Mapimí Municipality Mapimí ⓘ Ojuela Mine (TL) | Kampf (2009) |
| USA | |
| New Jersey Sussex County Ogdensburg Sterling Hill ⓘ Sterling Mine | Kampf (2009) +1 other reference |