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
GUID
(UUID V4):
(UUID V4):
7c855f05-fabd-4e59-b740-f56500904ee7
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 |
---|---|---|
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
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:
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.
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 % |
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
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
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Labels
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) |
---|---|---|---|---|---|---|---|
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 this 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 | NaFe2+Fe3+5(PO4)4(OH)6 · 2H2O | Mon. 2/m : B2/b |
Forms a series with:
Common Associates
Associated Minerals 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 | (Mg,Fe2+)2(PO4)F |
Related Minerals - Strunz-mindat Grouping
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 | Bariopharmacosiderite | Ba0.5Fe3+4(AsO4)3(OH)4 · 5H2O |
8.DK.10 | Pharmacosiderite | KFe3+4(AsO4)3(OH)4 · 6-7H2O |
8.DK.10 | Natropharmacosiderite | NaFe3+4(AsO4)3(OH)4 · 4H2O |
8.DK.10 | Hydroniumpharmacosiderite | (H3O)Fe4(AsO4)3(OH)4 · 4H2O |
8.DK.10 | Strontiopharmacosiderite | Sr0.5Fe4[(AsO4)3(OH)4] · 4H2O |
8.DK.10 | Thalliumpharmacosiderite | TlFe4[(AsO4)3(OH)4] · 4H2O |
8.DK.10 | Plumbopharmacosiderite | Pb0.5Fe3+4(AsO4)3(OH)4 · 5H2O |
8.DK.12 | Pharmacoalumite | KAl4(AsO4)3(OH)4 · 6.5H2O |
8.DK.12 | Natropharmacoalumite | NaAl4(AsO4)3(OH)4 · 4H2O |
8.DK.12 | Bariopharmacoalumite | Ba0.5Al4(AsO4)3(OH)4 · 4H2O |
8.DK.12 | Hydroniumpharmacoalumite | (H3O)Al4(AsO4)3(OH)4 · 4.5H2O |
8.DK.15 | Dufrénite | Ca0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2O |
8.DK.15 | Natrodufrénite | NaFe2+Fe3+5(PO4)4(OH)6 · 2H2O |
8.DK.15 | Matioliite | NaMgAl5(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
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Please feel free to link to this page.
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References for Burangaite
Reference List:
Ek, Roland, Nysten, Per (1990) Phosphate mineralogy of the Hålsjöberg and Hökensås kyanite deposits. Geologiska Föreningen i Stockholm Förhandlingar, 112 (1) 9-18 doi:10.1080/11035899009453156
Localities for Burangaite
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.
Austria | |
| Walter et al. (2001) +1 other reference |
Carinthia II (2000) | |
Rwanda (TL) | |
| von Knorring et al. (1977) +2 other references |
Sweden | |
| Ek et al. (1990) +1 other reference |
USA | |
| Jensen et al. (1995) |
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Hålsjöberg, Torsby, Värmland County, Sweden