Mineralogy Database

Burangaite Mineral Data

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General Burangaite Information

Help on Chemical  Formula: Chemical Formula: (Na,Ca)2(Fe++,Mg)2Al10(PO4)8(OH,O)12•4(H2O)
Help on Composition: Composition: Molecular Weight = 738.18 gm
   Sodium       2.18 %  Na    2.94 % Na2O
   Calcium      1.63 %  Ca    2.28 % CaO
   Magnesium    1.32 %  Mg    2.18 % MgO
   Aluminum    18.28 %  Al   34.53 % Al2O3
   Iron         6.05 %  Fe    6.81 % FeO /  1.08 % Fe2O3
   Phosphorus  16.78 %  P    38.46 % P2O5
   Hydrogen     1.31 %  H    11.71 % H2O
   Oxygen      52.45 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na0.7Ca0.3Fe2+0.7Mg0.4Al5Fe3+0.1(PO4)4(OH)5.6O0.6�2(H2O)
Help on Environment: Environment: Corroded aggregates with other phosphates in a zoned granite pegmatite.
Help on IMA Status: IMA Status: Approved IMA 1977
Help on Locality: Locality: Buranga pegmatite, near Gatumba, Rwanda. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Burangaite + Pronunciation Say BURANGAITE
Help on Synonym: Synonym: ICSD 84627
  PDF 29-1190

Burangaite Image

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  Burangaite   Gatumbaite

Comments: Small, blue burangaite crystals in beige gatumbaite.
Location: Horrsjoberg, Torby, Värmland, Sweden. Scale: Micro-mount Size.
© Sonke Stolze / Systematic Minerals

Burangaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =4.9702:1:2.6644
Help on Cell Dimensions: Cell Dimensions: a = 25.09, b = 5.048, c = 13.45, Z = 4; beta = 110.91° V = 1,591.31 Den(Calc)= 3.08
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 11.71(1), 3.081(0.9), 3.115(0.7),

Physical Properties of Burangaite

Help on Cleavage: Cleavage: {100} Perfect
Help on Color: Color: Blue, Greenish blue.
Help on Density: Density: 3.05
Help on Diaphaneity: Diaphaneity: Semitransparent
Help on Habit: Habit: Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 5 - Apatite
Help on Streak: Streak: light blue

Optical Properties of Burangaite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.029 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.039 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2044,KPDmeas= 0.2064,KC= 0.2126
Ncalc = 1.65
Help on Optical Data: Optical Data: Biaxial (-), a=1.611, b=1.635, g=1.643, bire=0.0320, 2V(Calc)=58, 2V(Meas)=58.
Help on Pleochroism (x): Pleochroism (x): light blue.
Help on Pleochroism (y): Pleochroism (y): dark blue.
Help on Pleochroism (z): Pleochroism (z): colorless.

Calculated Properties of Burangaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.04 gm/cc
note: Specific Gravity of Burangaite =3.05 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0028758519
Boson Index = 0.9971241481
Help on Photoelectric: Photoelectric: PEBurangaite = 3.39 barns/electron
U=PEBurangaite x rElectron Density= 10.31 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Burangaite is Not Radioactive

Burangaite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.09)where (A)3 (XO4)2 Zq � x(H2O)
  (42.09.01)Burangaite Group Burangaite (Na,Ca)2(Fe,Mg)2Al10(PO4)8(OH,O)12•4(H2O) C 2/c 2/m Dufrenite FeFe4(PO4)3(OH)5•2(H2O) C 2/c 2/m Natrodufrenite Na(Fe,Fe)(Fe,Al)5(PO4)4(OH)6•2(H2O) C 2/c 2/m IMA2008-056! NaMnFe5(PO4)4(OH)6•2H2O C 2/c 2/m Matioliite! NaMgAl5(PO4)4(OH)6•2H2O C 2/c 2/m
Help on  Strunz Class: Strunz Class: 08.DK.15 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DK -With large and medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
08.DK.15 Dufrenite FeFe4(PO4)3(OH)5•2(H2O) C 2/c 2/m
08.DK.15 Burangaite (Na,Ca)2(Fe,Mg)2Al10(PO4)8(OH,O)12•4(H2O) C 2/c 2/m
08.DK.15 Natrodufrenite Na(Fe,Fe)(Fe,Al)5(PO4)4(OH)6•2(H2O) C 2/c 2/m
08.DK.15 Matioliite! NaMgAl5(PO4)4(OH)6•2H2O C 2/c 2/m
08.DK.15 IMA2008-056! NaMnFe5(PO4)4(OH)6•2H2O C 2/c 2/m

Other Burangaite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)
Help on See Also: See Also: Links to other databases for Burangaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 08.DK.15





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