Burangaite Mineral Data (original) (raw)

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

Click Here for Larger Burangaite Image in a New Browser Window Images:

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 - PrismaticH-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),

Click Here for Large Burangaite Structure Window Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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H - Help Screen
I - Data Info
A - Atoms On/Off
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Help on Above

| | 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

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:

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

(42.09)where (A)3 (XO4)2 Zq � x(H2O)

(42.09.01)Burangaite Group

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

42.09.01.02 Dufrenite FeFe4(PO4)3(OH)5•2(H2O) C 2/c 2/m

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

42.09.01.04 IMA2008-056! NaMnFe5(PO4)4(OH)6•2H2O C 2/c 2/m

42.09.01.05 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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Ask about Burangaite here :
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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: 42.09.01.01 Strunz No: 08.DK.15
Locality:

Notes: