Burangaite Mineral Data

[Newest Minerals] [Mineral Auctions] [Mineral Gallery]
The Mineral Gallery's Exceptional Specimens and Mineral Hall of Fame
Visa, PayPal, and Mastercard are Welcomed

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.

Name Pronunciation:

Burangaite + Pronunciation

Synonym:

ICSD 84627

PDF 29-1190

Burangaite Image

Images:

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

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
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

Cleavage:

{100} Perfect

Color:

Blue, Greenish blue.

Density:

3.05

Diaphaneity:

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

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

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:

Bulk Density (Electron Density)=3.04 gm/cc
note: Specific Gravity of Burangaite =3.05 gm/cc.

Fermion Index:

Fermion Index = 0.0028758519
Boson Index = 0.9971241481

Photoelectric:

PE_Burangaite= 3.39 barns/electron
U=PE_Burangaite x rElectron Density= 10.31 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Burangaite is Not Radioactive

Burangaite Classification

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

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

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 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info

Search for Burangaite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Burangaite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Diamond Dan Publications

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Burangaite Mineral Data :

Ask about Burangaite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: