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Burangaite

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About BurangaiteHide

Formula:
NaFe2+Al5(PO4)4(OH)6 · 2H2O
Na may be replaced by minor Ca.
Colour:
Blue; colorless
Hardness:
5
Crystal System:
Monoclinic
Name:
Named for the type locality at the Buranga pegmatite, Gatumba District, Western Province, Rwanda.
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).


Classification of BurangaiteHide

Approved
Approval Year:
1976
First Published:
1973
7/D.11-120
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
42.9.1.1

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

Physical Properties of BurangaiteHide

Colour:
Blue; colorless
Comment:
Crystals often show an hourglass structure with a blue core and colorless margin
Streak:
Weakly bluish
Hardness:
Cleavage:
Perfect
Parallel to (100)

Optical Data of BurangaiteHide

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.
Surface Relief:
Moderate
Dispersion:
relatively strong
Pleochroism:
Strong
Comments:
With α light blue, β dark blue and γ colorless. Absorption β > α > γ.

Chemical Properties of BurangaiteHide

Formula:
NaFe2+Al5(PO4)4(OH)6 · 2H2O

Na may be replaced by minor Ca.

Chemical AnalysisHide

Oxide wt%:
 1
P2O537,65 %
Al2O334,35 %
Fe2O31,14 %
FeO6,26 %
MgO2,00 %
MnO0,40 %
CaO1,88 %
Na2O2,93 %
H2O+11,60 %
Insol2,06 %
Total:96 %
Sample references:
IDLocalityReference
1Buranga pegmatite, Gatumba, Ngororero District, Western Province, Rwandavon Knorring, O., Lehtinen, M., and Sahama, T.G. (1977) Burangaite, a new phosphate mineral from Rwanda. Bulletin of the Geological Society of Finland: 49: 33-36.

Crystallography of BurangaiteHide

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°
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.

Occurrences of BurangaiteHide

Paragenetic Mode(s):

Type Occurrence of BurangaiteHide

General Appearance of Type Material:
Conspicuous bluish-green radiating crystals in aplite or as bluish, long prismatic crystals.
Geological Setting of Type Material:
Granite pegmatite
Associated Minerals at Type Locality:

Synonyms of BurangaiteHide

Other Language Names for BurangaiteHide

Relationship of Burangaite to other SpeciesHide

Other Members of this group:
DufréniteCa0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2OMon. 2/m : B2/b
GayiteNaMn2+Fe3+5(PO4)4(OH)6 · 2H2OMon. 2/m : B2/b
MatioliiteNaMgAl5(PO4)4(OH)6 · 2H2OMon. 2/m : B2/b
NatrodufréniteNaFe2+Fe3+5(PO4)4(OH)6 · 2H2OMon.
Forms a series with:

Common AssociatesHide

Associated Minerals Based on Photo Data:
Berlinite2 photos of Burangaite associated with Berlinite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.DK.RichelsdorfiteCa2Cu5Sb(AsO4)4(OH)6Cl · 6H2OMon. 2/m
8.DK.10BariopharmacosideriteBa0.5Fe3+4(AsO4)3(OH)4 · 5H2OTet. 4 2m : P4 2m
8.DK.10PharmacosideriteKFe3+4(AsO4)3(OH)4 · 6-7H2OIso. 4 3m : P4 3m
8.DK.10Natropharmacosiderite(Na,K)Fe3+4(AsO4)3(OH)4 · 6-7H2OIso. 4 3m : P4 3m
8.DK.10Hydroniumpharmacosiderite(H3O)Fe4(AsO4)3(OH)4 · 4H2OIso. 4 3m : P4 3m
8.DK.12PharmacoalumiteKAl4(AsO4)3(OH)4 · 6.5H2OIso. 4 3m : P4 3m
8.DK.12NatropharmacoalumiteNaAl4(AsO4)3(OH)4 · 4H2OIso. 4 3m : P4 3m
8.DK.12BariopharmacoalumiteBa0.5Al4(AsO4)3(OH)4 · 4H2OIso. 4 3m : P4 3m
8.DK.15DufréniteCa0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2OMon. 2/m : B2/b
8.DK.15NatrodufréniteNaFe2+Fe3+5(PO4)4(OH)6 · 2H2OMon.
8.DK.15MatioliiteNaMgAl5(PO4)4(OH)6 · 2H2OMon. 2/m : B2/b
8.DK.15GayiteNaMn2+Fe3+5(PO4)4(OH)6 · 2H2OMon. 2/m : B2/b
8.DK.20KidwelliteNaFe3+9+x(PO4)6(OH)11 · 3H2O, x = 0.33Mon. 2/m : P2/b
8.DK.25Bleasdaleite(Ca,Fe3+)2Cu5(Bi,Cu)(PO4)4(H2O,OH,Cl)13Mon.
8.DK.30Matulaite(Fe3+,Al)Al7(PO4)4(PO3OH)2(OH)8(H2O)8 · 8H2OMon.
8.DK.35KrasnoviteBa(Al,Mg)(PO4,CO3)(OH)2 · H2OOrth.

Related Minerals - Dana Grouping (8th Ed.)Hide

42.9.1.2DufréniteCa0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2OMon. 2/m : B2/b
42.9.1.3NatrodufréniteNaFe2+Fe3+5(PO4)4(OH)6 · 2H2OMon.
42.9.1.5GayiteNaMn2+Fe3+5(PO4)4(OH)6 · 2H2OMon. 2/m : B2/b

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

19.14.1CyriloviteNaFe3+3(PO4)2(OH)4 · 2H2OTet. 4 2 2 : P41 21 2
19.14.2KidwelliteNaFe3+9+x(PO4)6(OH)11 · 3H2O, x = 0.33Mon. 2/m : P2/b
19.14.3Rosemaryite(Na,Ca,Mn)(Mn,Fe2+)(Fe3+,Mg)Al(PO4)3Mon. 2/m : P21/b
19.14.4Wyllieite(Na,Ca,Mn)(Mn,Fe)(Fe,Mg)Al(PO4)3Mon. 2/m
19.14.5Ferrowyllieite(Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO4)3Mon. 2/m : P21/b
19.14.6NatrodufréniteNaFe2+Fe3+5(PO4)4(OH)6 · 2H2OMon.
19.14.7LeucophosphiteKFe3+2(PO4)2(OH) · 2H2OMon. 2/m : P21/b
19.14.8Spheniscidite(NH4,K)(Fe3+,Al)2(PO4)2(OH) · 2H2OMon.
19.14.10Satterlyite(Fe2+,Mg,Fe)12(PO4)5(PO3OH)(OH,O)6Trig. 3m (3 2/m) : P3 1m
19.14.11UshkoviteMgFe3+2(PO4)2(OH)2 · 8H2OTric.
19.14.12Garyansellite(Mg,Fe)3(PO4)2(OH,O) · 1.5H2OOrth. mmm (2/m 2/m 2/m)
19.14.13ThadeuiteCa(Mg,Fe2+)3(PO4)2(OH,F)2Orth. 2 2 2 : C2 2 21
19.14.14AnapaiteCa2Fe2+(PO4)2 · 4H2OTric. 1 : P1
19.14.15XanthoxeniteCa4Fe3+2(PO4)4(OH)2 · 3H2OTric. 1 : P1
19.14.16CalcioferriteCa2Fe3+2(PO4)3(OH) · 7H2OMon. 2/m : B2/b
19.14.17MitridatiteCa2Fe3+3(PO4)3O2 · 3H2OMon. 2/m : B2/b
19.14.18MélonjosephiteCaFe2+Fe3+(PO4)2(OH)
19.14.19DelvauxiteCaFe4(PO4,SO4)2(OH)8 · 4-6H2O not confirmed · Amor.
19.14.20CollinsiteCa2Mg(PO4)2 · 2H2OTric. 1 : P1
19.14.21SegeleriteCa2 Mg2 Fe3+2(PO4)4(OH)2 · 8H2OOrth. mmm (2/m 2/m 2/m) : Pcca
19.14.22KingsmountiteCa4(Fe2+,Mn2+)Al4(PO4)6(OH)4 · 12H2OMon. 2 : B2
19.14.23VauxiteFe2+Al2(PO4)2(OH)2 · 6H2OTric. 1 : P1
19.14.24MetavauxiteFe2+Al2(PO4)2(OH)2 · 8H2OMon. 2/m : P21/b
19.14.25ParavauxiteFe2+Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
19.14.26SigloiteFe3+Al2(PO4)2(OH)3 · 7H2OTric.
19.14.27CacoxeniteFe3+24AlO6(PO4)17(OH)12 · 75H2OHex. 6/m : P63/m
19.14.28KoninckiteFe3+PO4 · 3H2OTet.
19.14.29LazuliteMgAl2(PO4)2(OH)2Mon. 2/m : P21/b
19.14.30ScorzaliteFe2+Al2(PO4)2(OH)2Mon. 2/m : P21/b
19.14.31Souzalite(Mg,Fe2+)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2OTric.
19.14.32Gormanite(Fe2+,Mg)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2OTric.
19.14.33ZaïriteBiFe3+3(PO4)2(OH)6Trig. 3m (3 2/m) : R3m

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for BurangaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
von Knorring, O. (1973) Notes of pegmatite minerals from Rwanda, Uganda and South West Africa. 17th Ann. Rep. Res. Inst. African Geol., Univ. Leeds: 72-73 [as an unnamed blue fibrous mineral].
von Knorring, O., Lehtinen, M., and Sahama, T.G. (1977) Burangaite, a new phosphate mineral from Rwanda. Bulletin of the Geological Society of Finland: 49: 33-36.
Ek, R. and Nysten, P. (1990) Phosphate mineralogy of the Hålsjöberg and Hökensås kyanite deposits. Geologiska Föreningens i Stockholm. Förhandlingar, Stockholm: 112: 9-18.
Selway, J.B., Cooper, M.A., and Hawthorne, F.C. (1997) Refinement of the crystal structure of burangaite. Canadian Mineralogist: 35: 1515-1522.
Daltry, V.D.C. and von Knorring, O. (1998) Type-mineralogy of Rwanda with particular reference to the Buranga pegmatite. Geologica Belgica: 1: 9-15.
American Mineralogist: 63: 793.
Atencio, D., Coutinho, J.M.V., Mascarenhas, Y.P., and Ellena, J.A. (2006) Matioliite, the Mg-analog of burangaite, from Gentil mine, Mendes Pimentel, Minas Gerais, Brazil, and other occurrences. American Mineralogist: 91:1932-1936.

Internet Links for BurangaiteHide

Localities for BurangaiteHide

ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Austria
 
  • Carinthia
    • Millstatt lake ridge
      • Spittal
        • Millstatt lake
Walter, F. & Ettinger, K. (2001): 1250. Burangait vom Hochgosch, Millstätter See-Rücken. Pp. 149-150 in NIEDERMAYR, G., F. BERNHARD, G. BLASS, H.-P. BOJAR, F. BRANDSTÄTTER, K. ETTINGER, H.-W. GRAF, V. M. F. HAMMER, B. LEIKAUF, H. MEDITZ, B. MOSER, W. POSTL, J. TAUCHER & P. TOMAZIC (2001): Neue Mineralfunde aus Österreich L. Carinthia II, 191./111.: 141-185; Am. Min. 91, 1932-1936 (2006)
Carinthia II (2000)
Rwanda (TL)
 
  • Western Province
    • Ngororero District
      • Gatumba
von Knorring, O., Lehtinen, M., and Sahama, T.G. (1977) Burangaite, a new phosphate mineral from Rwanda. Bulletin of the Geological Society of Finland: 49: 33-36.; Daltry, V.D.C. and von Knorring, O. (1998) Type-mineralogy of Rwanda with particular reference to the Buranga pegmatite. Geologica Belgica: 1: 9-15.; HB4 (2000)(?);
Sweden
 
  • Värmland
    • Torsby
Ek, R. and Nysten, P.E. (1990) Phosphate mineralogy of the Hålsjöberg and Hökensås kyanite deposits. Geologiska Föreningens I Stockholm. Förhandlingar, Stockholm: 112: 9-18.; Daltry, V.D.C. and von Knorring, O. (1998) Type-mineralogy of Rwanda with particular reference to the Buranga pegmatite. Geologica Belgica: 1: 9-15 (referring to Ek and Nysten, 1990).
USA
 
  • Nevada
    • Eureka Co.
      • Carlin Trend
        • Maggie Creek Subdistrict
MinRec 26(5):449-469.
Mineral and/or Locality  
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