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Braithwaiteite

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About BraithwaiteiteHide

R. S. W. Braithwaite
Formula:
NaCu5(Ti4+Sb5+)(AsO4)4(HAsO4)2O2 · 8H2O
Ti and Sb disordered on same crystal site: ratio is 0.87:1.13 in type material.
Colour:
blue
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
3.442
Crystal System:
Triclinic
Name:
Named in 2009 by Werner H. Paar, Mark A. Cooper, Frank C. Hawthorne, Elizabeth Moffatt, Mickey E. Gunter, Andrew C. Roberts, and Pete J. Dunn in honour of Richard S. W. Braithwaite [1930-], a British mineral spectroscopist and professor at the University of Manchester, United Kingdom.
New structure type.


Classification of BraithwaiteiteHide

Approved
Approval Year:
2006
8.DB.75

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
B : With only medium-sized cations, (OH, etc.):RO4< 1:1
39.3.16.

39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
3 : Miscellaneous

Pronounciation of BraithwaiteiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of BraithwaiteiteHide

Vitreous
Transparency:
Transparent
Colour:
blue
Streak:
Very pale blue
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
{001}
Density:
3.442 g/cm3 (Measured)    3.753 g/cm3 (Calculated)

Optical Data of BraithwaiteiteHide

Type:
Biaxial (-)
RI values:
nα = 1.698 nβ = 1.758 nγ = 1.784
2V:
Measured: 59° , Calculated: 65°
Birefringence:
0.085
Max Birefringence:
δ = 0.085
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
X = Y < Z
Optical Extinction:
X ^ a = 20.5°, X ^ b = 109.2° X ^ c = 110.8°
Pleochroism:
Visible
Comments:
X, Y Pale blue, Z Greenish blue

Chemical Properties of BraithwaiteiteHide

Formula:
NaCu5(Ti4+Sb5+)(AsO4)4(HAsO4)2O2 · 8H2O

Ti and Sb disordered on same crystal site: ratio is 0.87:1.13 in type material.
IMA Formula:
NaCu2+5(Sb5+Ti4+)O2(AsO4)4[AsO3(OH)]2 · 8H2O

Crystallography of BraithwaiteiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Setting:
P1
Cell Parameters:
a = 7.0308 Å, b = 9.8823 Å, c = 10.6754 Å
α = 106.973°, β = 104.274°, γ = 93.839°
Ratio:
a:b:c = 0.711 : 1 : 1.08
Unit Cell V:
679.76 ų (Calculated from Unit Cell)
Z:
1
Morphology:
lath-like. {100}, {103, {001}, {203}

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.825 (100)
5.887 (50)
4.635 (30)
3.354 (30)
3.232 (30)
2.947 (60)
2.736 (30)
2.442 (30)

Type Occurrence of BraithwaiteiteHide

General Appearance of Type Material:
Small dark sky-blue bladed crystals or masses.
Geological Setting of Type Material:
Oxidized portion of an epithermal vein deposit
Associated Minerals at Type Locality:

Synonyms of BraithwaiteiteHide

Common AssociatesHide

AlbiteNa(AlSi3O8)
AnataseTiO2
Chlorite GroupA group of mostly monoclinic (also triclinic or orthorhombic) micaceous phyllosilicate minerals with a structure ...
CovelliteCuS
EnargiteCu3AsS4
LammeriteCu3(AsO4)2
LavendulanNaCaCu5(AsO4)4Cl · 5H2O
Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
PyriteFeS2
QuartzSiO2

Related Minerals - Nickel-Strunz GroupingHide

8.DB.05DiadochiteFe3+2(PO4)(SO4)(OH) · 5H2OAmor.
8.DB.05Pitticite(Fe, SO4, AsO4, H2O) ?Amor.
8.DB.05DestineziteFe3+2(PO4)(SO4)(OH) · 6H2OTric. 1 : P1
8.DB.10VashegyiteAl11(PO4)9(OH)6 · 38H2OOrth. mmm (2/m 2/m 2/m)
8.DB.15SchooneriteZnMn2+Fe2+2Fe3+(PO4)3(OH)2 · 9H2OOrth. mmm (2/m 2/m 2/m) : Pbam
8.DB.20SinkankasiteMn2+Al(PO3OH)2(OH) · 6H2OTric.
8.DB.25MitryaevaiteAl6(PO4)((P,S)O3(OH,O))2F2(OH)2 · 14.5H2OTric.
8.DB.30SanjuaniteAl2(PO4)(SO4)(OH) · 9H2O
8.DB.35SarmientiteFe3+2(AsO4)(SO4)(OH) · 5H2OMon. 2/m : P21/b
8.DB.40BukovskýiteFe3+2(AsO4)(SO4)(OH) · 9H2OTric. 1 : P1
8.DB.45ZýkaiteFe3+4(AsO4)3(SO4)(OH) · 15H2OOrth.
8.DB.50GiniiteFe2+Fe3+4(PO4)3(OH)5 · 2H2OMon. 2/m : P2/b
8.DB.55Sasaite(Al,Fe3+)14(PO4)11(SO4)(OH)7 · 83H2OOrth.
8.DB.60McauslaniteFe3Al2(PO4)3(PO3OH)F · 18H2OTric.
8.DB.65GoldquarryiteCuCd2Al3(PO4)4F2(H2O,F)2 · 10H2OTric. 1 : P1
8.DB.70BirchiteCd2Cu2(PO4)2(SO4) · 5H2OOrth. mmm (2/m 2/m 2/m) : Pnma

Fluorescence of BraithwaiteiteHide

Not fluorescent in UV.

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 BraithwaiteiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Hawthorne, F.C., Cooper, M.A. & Paar, W.H. (2008): The crystal structure of braithwaiteite. Journal of Coordination Chemistry 61, 15-29.
Paar, W.H., Cooper, M.A., Hawthorne, F.C., Moffatt, E., Gunther, M.E., Roberts, A.C., Dunn, P.J. (2009): Braithwaiteite, NaCu5(TiSb)2O2(AsO4)[AsO3(OH)]2 · 8H2O, a new mineral species from Laurani, Bolivia. Canadian Mineralogist, 47, 947-952.

Internet Links for BraithwaiteiteHide

Localities for BraithwaiteiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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.
Bolivia (TL)
 
  • La Paz Department
    • Aroma Province
      • Laurani District
Canadian Mineralogist 47,947(2009)
Mineral and/or Locality  
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