Burangaite Mineral Data

Burangaite Mineral Data +

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General Burangaite Information

Chemical Formula:

(Na,Ca)2(Fe++,Mg)2Al10(PO4)8(OH,O)12·4(H2O)

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

Empirical Formula:

Na_0.7Ca_0.3Fe²⁺_0.7Mg_0.4Al₅Fe³⁺_0.1(PO₄)₄(OH)_5.6O_0.6·2(H₂O)

Environment:

Corroded aggregates with other phosphates in a zoned granite pegmatite.

IMA Status:

Approved IMA 1977

Locality:

Buranga pegmatite, near Gatumba, Rwanda. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 84627

PDF 29-1190

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Burangaite Crystallography

Axial Ratios:

a:b:c =4.9702:1:2.6644

Cell Dimensions:

a = 25.09, b = 5.048, c = 13.45, Z = 4; beta = 110.91° V = 1,591.31 Den(Calc)= 3.08

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 11.71(1), 3.081(0.9), 3.115(0.7),

Crystal Structure:

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Selway J B , Cooper M A , Hawthorne F C , The Canadian Mineralogist , 35 (1997) p.1515-1522, Refinement of the crystal structure of burangaite

Physical Properties of Burangaite

Cleavage:

[100] Perfect

Color:

Blue, Greenish blue.

Density:

3.05

Diaphaniety:

Semitransparent

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

5 - Apatite

Streak:

light blue

Optical Properties of Burangaite

Optical Data:

Biaxial (-), a=1.611, b=1.635, g=1.643, bire=0.0320, 2V(Calc)=58, 2V(Meas)=58.

Pleochroism (x):

light blue.

Pleochroism (y):

dark blue.

Pleochroism (z):

colorless.

Calculated Properties of Burangaite

Electron Density:

r_electron=3.07 gm/cc
note: r_Burangaite=3.08 gm/cc.

Fermion Index

Fermion Index = 0.00287
Boson Index = 0.99713

Photoelectric:

PE_Burangaite= 3.39 barns/electron
U=PE_Burangaite x r_electron= 10.41 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Burangaite is Not Radioactive

Burangaite Classification

Dana Class:

42.9.1.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.9)where (A)3 (XO4)2 Zq · x(H2O)

(42.9.1)Dana Group

42.9.1.1 Burangaite (Na,Ca)2(Fe,Mg)2Al10(PO4)8(OH,O)12·4(H2O) C 2/c 2/m

42.9.1.2 Dufrenite FeFe4(PO4)3(OH)5·2(H2O) C 2/c 2/m

42.9.1.3 Natrodufrenite Na(Fe,Fe)(Fe,Al)5(PO4)4(OH)6·2(H2O) C 2/c 2/m

Strunz Class:

VII/D.11-120 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.11 - Strunzite series

VII/D.11-10 Ferrostrunzite FeFe2(PO4)2(OH)2·6(H2O) P 1,P1 Tri

VII/D.11-20 Strunzite MnFe2(PO4)2(OH)2·6(H2O) P1 1

VII/D.11-30 Ferristrunzite FeFe2(PO4)2(OH)3·5(H2O) P1,P 1 Tri

VII/D.11-40 Bermanite MnMn2(PO4)2(OH)2·4(H2O) P 2₁ 2

VII/D.11-50 Cacoxenite (Fe,Al)25(PO4)17O6(OH)12·75(H2O) P 6/mmm 6/m 2/m 2/m

VII/D.11-60 Tinticite Fe5(PO4,VO4)4·7(H2O) P1 1

VII/D.11-70 Beraunite FeFe5(PO4)4(OH)5·4(H2O) C 2/c 2/m

VII/D.11-71 Oxiberaunite* (Fe,Mn)Fe5(PO4)4O(OH)4·6(H2O) Mono

VII/D.11-90 Souzalite (Mg,Fe)3(Al,Fe)4(PO4)4(OH)6·2(H2O) P1,P 1 Tri

VII/D.11-100 Gormanite Fe3Al4(PO4)4(OH)6·2(H2O) P1,P 1 Tri

VII/D.11-110 Dufrenite FeFe4(PO4)3(OH)5·2(H2O) C 2/c 2/m

VII/D.11-120 Burangaite (Na,Ca)2(Fe,Mg)2Al10(PO4)8(OH,O)12·4(H2O) C 2/c 2/m

VII/D.11-130 Natrodufrenite Na(Fe,Fe)(Fe,Al)5(PO4)4(OH)6·2(H2O) C 2/c 2/m

VII/D.11-135 Ercitite! Na(Mn,Fe)(PO4)(OH)·2(H2O) P 2₁/n 2/m

VII/D.11-140 Kidwellite Na(Fe,Cu)9x(PO4)6(OH)11·3(H2O) P 2/c 2/m

VII/D.11-150 Meurigite! KFe7(PO4)5(OH)7·8(H2O) C 2,Cm,C 2/m Mono

Other Burangaite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)

See Also:

Links to other databases for Burangaite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Print or Cut-and-Paste your Burangaite Specimen Label here :

Burangaite

(Na,Ca)2(Fe++,Mg)2Al10(PO4)8(OH,O)12·4(H2O)
Dana No: 42.9.1.1 Strunz No: VII/D.11-120
Locality:

Notes: