Barahonaite-(Fe)
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Barahonaite-(Fe)
Antonio Barahona (right) and his grandson.
Formula:
(Ca,Cu,Na,Fe3+,Al)12Fe3+2(AsO4)8(OH,Cl)x · nH2O
Colour:
Greenish-yellow
Lustre:
Vitreous
Crystal System:
Monoclinic
Name:
Named for Antonio Barahona (1937- ), Spanish mineral collector and micromounter, who first noticed that this material might be a new mineral.
Type Locality:
Unique Identifiers
Mindat ID:
32159
Long-form identifier:
mindat:1:1:32159:2
Similar Names
| Barahonaite | A synonym | |
| Barahonaite-(Al) | A valid IMA mineral species | (Ca,Cu,Na,Fe3+,Al)12Al2(AsO4)8(OH,Cl)x · nH2O |
IMA Classification of Barahonaite-(Fe)
Approved
IMA Formula:
(Ca,Cu2+,Na,Fe3+,Al)12Fe3+2(As5+O4)8(OH,Cl)x·nH2O
Approval year:
2006
First published:
2008
Classification of Barahonaite-(Fe)
8.CH.60
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
H : With large and medium-sized cations, RO4:H2O < 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
H : With large and medium-sized cations, RO4:H2O < 1:1
40.6.4.1
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
6 : (AB)5(XO4)4·xH2O
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
6 : (AB)5(XO4)4·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 for Standard |
|---|---|---|
| Bho-Fe | 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 Barahonaite-(Fe)
Vitreous
Transparency:
Transparent, Translucent
Colour:
Greenish-yellow
Streak:
White to pale yellow
Hardness Data:
Could not be measured
Comment:
Not determinable, crusts are easily scratched with a fingernail, likely due to disaggregation rather than true hardness.
Tenacity:
Brittle
Optical Data of Barahonaite-(Fe)
Type:
Biaxial (-)
RI values:
nα = 1.664(2) nβ = 1.677 nγ = 1.677(2)
2V:
Measured: 45° to 80°
Max. Birefringence:
δ = 0.013
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
None observed.
Optical Extinction:
X is perpendicular to the crystal plates, and Y and Z are within the plates.
Pleochroism:
Not Visible
Comments:
The β value above is not given, but rather the relation β ≈ γ.
Chemistry of Barahonaite-(Fe)
Mindat Formula:
(Ca,Cu,Na,Fe3+,Al)12Fe3+2(AsO4)8(OH,Cl)x · nH2O
Crystallography of Barahonaite-(Fe)
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/b
Cell Parameters:
a = 10.172 Å, b = 22.43 Å, c = 5.286 Å
β = 93.09°
β = 93.09°
Ratio:
a:b:c = 0.453 : 1 : 0.236
Unit Cell V:
1,204.29 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 22.0 Å | (100) |
| 11.2 Å | (70) |
| 5.068 Å | (20) |
| 3.345 Å | (20) |
| 2.763 Å | (30) |
| 2.660 Å | (20) |
| 2.541 Å | (20) |
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] | |
| 47g : [Halogen-bearing surface weathering minerals] |
Type Occurrence of Barahonaite-(Fe)
General Appearance of Type Material:
Isolated, rosette-like beads, up to about 200 µm in diameter. Sparse coatings on fracture surfaces and coalescences of glittering beads. The beads consist of razor-thin, tabular, composite crystals whose maximum length is about 20 µm.
Place of Conservation of Type Material:
Canadian Museum of Nature at Ottawa, Ontario, Canada, number CMNMC 85716.
Geological Setting of Type Material:
An oxidation mineral occurring as coatings and within closely spaced fractures in weathered siliceous and micaceous host-rocks.
Associated Minerals at Type Locality:
Synonyms of Barahonaite-(Fe)
Other Language Names for Barahonaite-(Fe)
Common Associates
Associations Based on Photo Data:
| 18 photos of Barahonaite-(Fe) associated with Conichalcite | CaCu(AsO4)(OH) |
| 9 photos of Barahonaite-(Fe) associated with Lavendulan | NaCaCu5(AsO4)4Cl · 5H2O |
| 6 photos of Barahonaite-(Fe) associated with Barahonaite-(Al) | (Ca,Cu,Na,Fe3+,Al)12Al2(AsO4)8(OH,Cl)x · nH2O |
| 6 photos of Barahonaite-(Fe) associated with Cobaltarthurite | CoFe3+2(AsO4)2(OH)2 · 4H2O |
| 6 photos of Barahonaite-(Fe) associated with Arsenocrandallite | CaAl3(AsO4)(AsO3OH)(OH)6 |
| 5 photos of Barahonaite-(Fe) associated with Arseniosiderite | Ca2Fe3+3(AsO4)3O2 · 3H2O |
| 5 photos of Barahonaite-(Fe) associated with Yukonite | Ca3Fe3+(AsO4)2(OH)3 · 5H2O |
| 2 photos of Barahonaite-(Fe) associated with Arsenogoyazite | SrAl3(AsO4)(AsO3OH)(OH)6 |
| 1 photo of Barahonaite-(Fe) associated with Natropharmacosiderite | NaFe3+4(AsO4)3(OH)4 · 4H2O |
| 1 photo of Barahonaite-(Fe) associated with Olivenite | Cu2(AsO4)(OH) |
Related Minerals - Strunz-mindat Grouping
| 8.CH. | Georgeliuite | Ca2Mn3+3O2(AsO4)3(H2O)2 · H2O |
| 8.CH.05 | Natrowalentaite | [Fe3+0.5Na0.5(H2O)6][NaAs3+2(Fe3+2.33W6+0.67)(PO4)2O7] |
| 8.CH.05 | Walentaite | [Mn2+(H2O)6][◻As3+3Fe3+3(PO4)2O7] |
| 8.CH.05 | Halilsarpite | [Mg(H2O)6][CaAs3+2(Fe3+2.67Mo6+0.33)(AsO4)2O7] |
| 8.CH.10 | Anapaite | Ca2Fe2+(PO4)2 · 4H2O |
| 8.CH.15 | Picropharmacolite | Ca4Mg(AsO4)2(HAsO4)2 · 11H2O |
| 8.CH.20 | Dittmarite | (NH4)Mg(PO4) · H2O |
| 8.CH.20 | Niahite | (NH4)Mn2+(PO4) · H2O |
| 8.CH.25 | Taranakite | K3Al5(PO3OH)6(PO4)2 · 18H2O |
| 8.CH.25 | Francoanellite | K3Al5(PO3OH)6(PO4)2 · 12H2O |
| 8.CH.25 | Macivorite | (NH4)3Al5(PO3OH)6(PO4)2 · 18H2O |
| 8.CH.30 | Schertelite | (NH4)2MgH2(PO4)2 · 4H2O |
| 8.CH.35 | Hannayite | (NH4)2Mg3H4(PO4)4 · 8H2O |
| 8.CH.40 | Hazenite | KNaMg2(PO4)2 · 14H2O |
| 8.CH.40 | Struvite-(K) | KMg(PO4) · 6H2O |
| 8.CH.40 | Struvite | (NH4)Mg(PO4) · 6H2O |
| 8.CH.45 | Rimkorolgite | (Mg,Mn)5(Ba,Sr,Ca)(PO4)4 · 8H2O |
| 8.CH.50 | Bakhchisaraitsevite | Na2Mg5(PO4)4 · 7H2O |
| 8.CH.55 | Smolyaninovite | Co3Fe3+2(AsO4)4 · 11H2O |
| 8.CH.55 | Fahleite | CaZn5Fe3+2(AsO4)6 · 14H2O |
| 8.CH.60 | Barahonaite-(Al) | (Ca,Cu,Na,Fe3+,Al)12Al2(AsO4)8(OH,Cl)x · nH2O |
| 8.CH.70 | Epifanovite | NaCaCu5(PO4)4[AsO2(OH)2] · 7H2O |
| 8.CH.75 | Esdanaite-(Ce) | NaMnCe(PO4)2 · 4H2O |
Fluorescence of Barahonaite-(Fe)
Not fluorescent.
Other Information
Notes:
Readily soluble without effervescence in 10% HCl at room temperature.
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 Barahonaite-(Fe)
mindat.org URL:
https://www.mindat.org/min-32159.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Barahonaite-(Fe)
Reference List:
Viñals, J., Jambor, J. L., Raudsepp, M., Roberts, A. C., Grice, J. D., Kokinos, M., Wise, W. S. (2008) Barahonaite-(Al) and barahonaite-(Fe), new Ca-Cu arsenate mineral species, from Murcia Province, southeastern Spain, and Gold Hill, Utah. The Canadian Mineralogist, 46 (1) 205-217 doi:10.3749/canmin.46.1.205
Localities for Barahonaite-(Fe)
Showing 1 localities.
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Spain (TL) | |
| Viñals et al. (2008) |
Quick NavTopAbout Barahonaite-(Fe)Unique IdentifiersSimilar NamesIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
La Reconquistada claim, Pastrana, Mazarrón, Murcia, Spain