Burangaite
A valid IMA mineral species
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About Burangaite
Formula:
NaFe2+Al5(PO4)4(OH)6 · 2H2O
Na may be replaced by minor Ca.
Colour:
Blue; colorless
Hardness:
5
Crystal System:
Monoclinic
Member of:
Name:
Named for the type locality at the Buranga pegmatite, Gatumba District, Western Province, Rwanda.
Isostructural with:
Burangaite-Matioliite Series. Fe2+ analogue of Matioliite. A replacement product of scorzalite.
Several "Mg-rich" burangaites reported in the literature may, in fact, be matioliite (Atencio et al., 2006).
Several "Mg-rich" burangaites reported in the literature may, in fact, be matioliite (Atencio et al., 2006).
Unique Identifiers
Mindat ID:
802
Long-form identifier:
mindat:1:1:802:6
IMA Classification of Burangaite
Classification of Burangaite
8.DK.15
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
K : With large and medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
K : With large and medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
42.9.1.1
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
9 : (AB)7(XO4)4Zq·xH2O
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
9 : (AB)7(XO4)4Zq·xH2O
19.14.9
19 : Phosphates
14 : Phosphates of Fe and other metals
19 : Phosphates
14 : Phosphates of Fe and other metals
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 |
|---|---|---|
| Brg | 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 Burangaite
Colour:
Blue; colorless
Comment:
Crystals often show an hourglass structure with a blue core and colorless margin.
Streak:
Weakly bluish
Hardness:
5 on Mohs scale
Cleavage:
Perfect
Parallel to (100)
Parallel to (100)
Optical Data of Burangaite
Type:
Biaxial (-)
RI values:
nα = 1.611 nβ = 1.635 nγ = 1.643
2V:
Measured: 58° , Calculated: 58°
Max. Birefringence:
δ = 0.032
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:
Moderate
Dispersion:
relatively strong
Optical Extinction:
Z = b; X ∧ c = 11°.
Pleochroism:
Strong
Comments:
X = light blue; Y = dark blue; Z = colorless.
Comments:
Absorption: Y > X > Z.
Chemistry of Burangaite
Mindat Formula:
NaFe2+Al5(PO4)4(OH)6 · 2H2O
Na may be replaced by minor Ca.
Na may be replaced by minor Ca.
Element Weights:
Chemical Analysis
Oxide wt%:
| 1 | |
|---|---|
| P2O5 | 37.65 % |
| Al2O3 | 34.35 % |
| Fe2O3 | 1.14 % |
| FeO | 6.26 % |
| MgO | 2.00 % |
| MnO | 0.40 % |
| CaO | 1.88 % |
| Na2O | 2.93 % |
| H2O+ | 11.60 % |
| Insol | 2.06 % |
| Total: | 100.27 % |
Sample references:
Crystallography of Burangaite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 25.09 Å, b = 5.04 Å, c = 13.45 Å
β = 110.91°
β = 110.91°
Ratio:
a:b:c = 4.978 : 1 : 2.669
Unit Cell V:
1,588.79 ų (Calculated from Unit Cell)
Morphology:
Long prismatic crystals, characteristically bladed in appearance. Forms include {301}, {102}, {104}, , {223}, {311}, {223}, {311}, and {401}.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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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) |
|---|---|---|---|---|---|---|---|
| 0005534 | Burangaite | Selway J B, Cooper M A, Hawthorne F C (1997) Refinement of the crystal structure of burangaite The Canadian Mineralogist 35 1515-1522 |  | 1997 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 11.71 Å | (100) |
| 3.081 Å | (90) |
| 3.115 Å | (70) |
| 4.86 Å | (41) |
| 3.318 Å | (39) |
| 2.044 Å | (32) |
| 1.6746 Å | (28) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] |
Type Occurrence of Burangaite
General Appearance of Type Material:
Conspicuous bluish-green radiating crystals in aplite or as bluish, long prismatic crystals.
Place of Conservation of Type Material:
n.d.
Geological Setting of Type Material:
Granite pegmatite.
Associated Minerals at Type Locality:
Synonyms of Burangaite
Other Language Names for Burangaite
Relationship of Burangaite to other Species
Member of:
Other Members of Dufrénite Group:
| Bimbowrieite | NaMgFe3+5(PO4)4(OH)6 · 2H2O | Mon. 2/m : B2/b |
| Dufrénite | Ca0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2O | Mon. 2/m : B2/b |
| Gayite | NaMn2+Fe3+5(PO4)4(OH)6 · 2H2O | Mon. 2/m : B2/b |
| Matioliite | NaMgAl5(PO4)4(OH)6 · 2H2O | Mon. 2/m : B2/b |
| Natrodufrénite | NaFe3+Fe3+5(PO4)4O(OH)5(H2O)2 | Mon. 2/m : B2/b |
Forms a series with:
Common Associates
Associations Based on Photo Data:
| 5 photos of Burangaite associated with Berlinite | AlPO4 |
| 3 photos of Burangaite associated with Scorzalite | Fe2+Al2(PO4)2(OH)2 |
| 2 photos of Burangaite associated with Trolleite | Al4(PO4)3(OH)3 |
| 2 photos of Burangaite associated with Rutile | TiO2 |
| 2 photos of Burangaite associated with Augelite | Al2(PO4)(OH)3 |
| 1 photo of Burangaite associated with Wagnerite | Mg2(PO4)F |
| 1 photo of Burangaite associated with Amblygonite | LiAl(PO4)F |
Related Minerals - Strunz-mindat Grouping
| 8.DK. | Regerite | KFe6(PO4)4(OH)7(H2O)6 · 4H2O |
| 8.DK. | Richelsdorfite | Ca2Cu5Sb(AsO4)4(OH)6Cl · 6H2O |
| 8.DK. | Bimbowrieite | NaMgFe3+5(PO4)4(OH)6 · 2H2O |
| 8.DK. | Puttapaite | Pb2Mn2+2ZnCr3+4O2(AsO4)4(OH)6 · 12H2O |
| 8.DK.10 | Thalliumpharmacosiderite | TlFe3+4[(AsO4)3(OH)4] · 4H2O |
| 8.DK.10 | Natropharmacosiderite | NaFe3+4(AsO4)3(OH)4 · 4H2O |
| 8.DK.10 | Pharmacosiderite | KFe3+4(AsO4)3(OH)4 · 6-7H2O |
| 8.DK.10 | Plumbopharmacosiderite | Pb0.5Fe3+4(AsO4)3(OH)4 · 5H2O |
| 8.DK.10 | Strontiopharmacosiderite | Sr0.5Fe3+4[(AsO4)3(OH)4] · 4H2O |
| 8.DK.10 | Bariopharmacosiderite | Ba0.5Fe3+4(AsO4)3(OH)4 · 5H2O |
| 8.DK.10 | Hydroniumpharmacosiderite | (H3O)Fe3+4(AsO4)3(OH)4 · 4H2O |
| 8.DK.12 | Hydroniumpharmacoalumite | (H3O)Al4(AsO4)3(OH)4 · 4.5H2O |
| 8.DK.12 | Bariopharmacoalumite | Ba0.5Al4(AsO4)3(OH)4 · 4H2O |
| 8.DK.12 | Pharmacoalumite | KAl4(AsO4)3(OH)4 · 6.5H2O |
| 8.DK.12 | Calciopharmacoalumite | Ca0.5Al4(AsO4)3(OH)4 · 5H2O |
| 8.DK.12 | Natropharmacoalumite | NaAl4(AsO4)3(OH)4 · 4H2O |
| 8.DK.15 | Matioliite | NaMgAl5(PO4)4(OH)6 · 2H2O |
| 8.DK.15 | Natrodufrénite | NaFe3+Fe3+5(PO4)4O(OH)5(H2O)2 |
| 8.DK.15 | Dufrénite | Ca0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2O |
| 8.DK.15 | Gayite | NaMn2+Fe3+5(PO4)4(OH)6 · 2H2O |
| 8.DK.20 | Kidwellite | NaFe3+9+x(PO4)6(OH)11 · 3H2O, x = 0.33 |
| 8.DK.25 | Bleasdaleite | (Ca,Fe3+)2Cu5(Bi,Cu)(PO4)4(H2O,OH,Cl)13 |
| 8.DK.30 | Matulaite | (Fe3+,Al)Al7(PO4)4(PO3OH)2(OH)8(H2O)8 · 8H2O |
| 8.DK.35 | Krasnovite | Ba(Al,Mg)(PO4,CO3)(OH)2 · H2O |
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 Burangaite
mindat.org URL:
https://www.mindat.org/min-802.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Burangaite
Reference List:
von Knorring, O., Lehtinen, M., Sahama, Th.G. (1977) Burangaite, a new phosphate mineral from Rwanda. Bulletin of the Geological Society of Finland, 49 (1). 33-36 doi:10.17741/bgsf/49.1.006
Fleischer, Michael; Pabst, Adolf, White, John Sampson (1978) New mineral names. American Mineralogist, 63 (7-8). 793-796
Localities for Burangaite
Showing 6 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.
Austria | |
| Niedermayr et al. (2001) +1 other reference |
| Brandstätter et al. (2000) | |
Rwanda (TL) | |
| von Knorring et al. (1977) +2 other references |
Spain | |
| Vérez et al. (2024) |
Sweden | |
| Ek et al. (1990) +1 other reference |
USA | |
| Newmont Mining Corporation |
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Hålsjöberg, Torsby, Värmland County, Sweden