Miguelromeroite
A valid IMA mineral species
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About Miguelromeroite
Formula:
MnMn2Mn2(AsO4)2(HAsO4)2 · 4H2O
Colour:
Orange-pink
Lustre:
Vitreous
Hardness:
4
Specific Gravity:
3.69
Crystal System:
Monoclinic
Member of:
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.
Type Locality:
Hureaulite Group.
Mn analogue of sainfeldite. Known as a synthetic compound (Stock et al. 2002).
Note: The samples from the Veta Negra mine, Chile, were originally labeled "villyaellenite".
Mn analogue of sainfeldite. Known as a synthetic compound (Stock et al. 2002).
Note: The samples from the Veta Negra mine, Chile, were originally labeled "villyaellenite".
Unique Identifiers
Mindat ID:
39333
Long-form identifier:
mindat:1:1:39333:1
GUID
(UUID V4):
(UUID V4):
92bb803a-d5be-44f2-9238-efee5a77deaa
IMA Classification of Miguelromeroite
Classification of Miguelromeroite
8.CB.10
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
B : With only medium-sized cations, RO4:H2O = 1:1
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
39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
2 : (AB)5[HXO4]2[XO4]2.xH2O
Mineral Symbols
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 Miguelromeroite
Vitreous
Transparency:
Transparent
Colour:
Orange-pink
Streak:
Very pale pink
Hardness:
4 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
on {100}
on {100}
Fracture:
Conchoidal
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 Miguelromeroite
Type:
Biaxial (-)
RI values:
nα = 1.713(2) nβ = 1.723(2) nγ = 1.729(2)
2V:
Measured: 70° (5), Calculated: 75°
Max Birefringence:
δ = 0.016
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
None observed
Optical Extinction:
X = b, Z ∧ c = 40° in obtuse β.
Pleochroism:
Visible
Comments:
Shades of pale pink.
Comments:
Absorption: Z >> X > Y.
Chemistry of Miguelromeroite
Mindat Formula:
MnMn2Mn2(AsO4)2(HAsO4)2 · 4H2O
Elements listed:
Crystallography of Miguelromeroite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Cell Parameters:
a = 18.0300(10) Å, b = 9.2715(5) Å, c = 9.7756(5) Å
β = 96.266(2)°
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}.
Twinning:
None observed.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Big Balls | Small Balls | Just Balls | Spacefill
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Big Balls | Small Balls | Just Balls | Spacefill
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CIF File Best | x | y | z | a | b | c
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Rotation
Stop | Start
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Console Off | On | Grey | Yellow
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
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 Diffraction
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 Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
47d : [Arsenates, antimonates, selenates, bismuthinates] | |
Stage 10b: Anthropogenic minerals | <10 Ka |
55 : Anthropogenic mine minerals |
Type Occurrence of Miguelromeroite
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 Miguelromeroite
Other Language Names for Miguelromeroite
Spanish:Miguelromeroita
Relationship of Miguelromeroite to other Species
Member of:
Other Members of this group:
Chongite | Ca3Mg2(AsO4)2(AsO3OH)2 · 4H2O | Mon. 2/m : B2/b |
Giftgrubeite | CaMn2Ca2(AsO4)2(AsO3OH)2 · 4H2O | Mon. 2/m : B2/b |
Hureaulite | Mn2+5(PO3OH)2(PO4)2 · 4H2O | Mon. 2/m : B2/b |
Nyholmite | Cd3Zn2(AsO4)2(HAsO4)2 · 4H2O | Mon. 2/m : B2/b |
Sainfeldite | Ca5(AsO4)2(AsO3OH)2 · 4H2O | Mon. 2/m : B2/b |
Villyaellenite | MnMn2Ca2(AsO4)2(HAsO4)2 · 4H2O | Mon. 2/m : B2/b |
Common Associates
Associated Minerals Based on Photo Data:
7 photos of Miguelromeroite associated with Hydrozincite | Zn5(CO3)2(OH)6 |
4 photos of Miguelromeroite associated with Erythrite | Co3(AsO4)2 · 8H2O |
3 photos of Miguelromeroite associated with Arseniosiderite | Ca2Fe3+3(AsO4)3O2 · 3H2O |
2 photos of Miguelromeroite associated with Hemimorphite | Zn4Si2O7(OH)2 · H2O |
2 photos of Miguelromeroite associated with Adamite | Zn2(AsO4)(OH) |
2 photos of Miguelromeroite associated with Zincolivenite | CuZn(AsO4)(OH) |
2 photos of Miguelromeroite associated with Tetrahedrite Subgroup | Cu6(Cu4C2+2)Sb4S12S |
2 photos of Miguelromeroite associated with Ludlockite | PbFe3+4As3+10O22 |
2 photos of Miguelromeroite associated with Parnauite | Cu9(AsO4)2(SO4)(OH)10 · 7H2O |
1 photo of Miguelromeroite associated with Parabrandtite | Ca2Mn2+(AsO4)2 · 2H2O |
Related Minerals - Strunz-mindat Grouping
8.CB. | Krupičkaite | Cu6[AsO3(OH)]6 · 8H2O |
8.CB. | Ermeloite | Al(PO4) · H2O |
8.CB.05 | Serrabrancaite | MnPO4 · H2O |
8.CB.10 | Hureaulite | Mn2+5(PO3OH)2(PO4)2 · 4H2O |
8.CB.10 | Villyaellenite | MnMn2Ca2(AsO4)2(HAsO4)2 · 4H2O |
8.CB.10 | UM1997-09-AsO:CaHMgZn | (Mg,Ca,Zn)5(AsO4)2(HAsO4)2 · 4H2O |
8.CB.10 | Nyholmite | Cd3Zn2(AsO4)2(HAsO4)2 · 4H2O |
8.CB.10 | Giftgrubeite | CaMn2Ca2(AsO4)2(AsO3OH)2 · 4H2O |
8.CB.15 | Krautite | Mn(HAsO4) · H2O |
8.CB.20 | Cobaltkoritnigite | Co(AsO3OH) · H2O |
8.CB.20 | Koritnigite | Zn(AsO3OH) · H2O |
8.CB.20 | Magnesiokoritnigite | Mg(AsO3OH) · H2O |
8.CB.25 | Yvonite | Cu(HAsO4) · 2H2O |
8.CB.30 | Geminite | Cu2+(AsO3OH) · H2O |
8.CB.35 | Schubnelite | Fe3+VO4 · H2O |
8.CB.40 | Radovanite | Cu2Fe3+(AsO4)(HAs3+O3)2 · H2O |
8.CB.45 | Kazakhstanite | Fe3+5V4+3V5+12O39(OH)9 · 9H2O |
8.CB.50 | Kolovratite | NixZny(VO4)0.67(x+y) · nH2O |
8.CB.60 | Burgessite | Co2(H2O)4[AsO3(OH)]2(H2O) |
8.CB.60 | Honzaite | Ni2(AsO3OH)2 · 5H2O |
8.CB.65 | Cardite | Zn5.5(AsO4)2(AsO3OH)(OH)3 · 3H2O |
Other Information
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 Miguelromeroite
mindat.org URL:
https://www.mindat.org/min-39333.html
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References for Miguelromeroite
Localities for Miguelromeroite
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
Chile | |
| samples analysed by Jochen Schlüter |
Kampf (2009) | |
Japan | |
| Kampf (2009) |
Mexico (TL) | |
| Kampf (2009) |
USA | |
| Kampf (2009) +1 other reference |
Quick NavTopAbout MiguelromeroiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Veta Negra Mine, Pampa Larga mining district, Tierra Amarilla, Copiapó Province, Atacama, Chile