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Brandãoite

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About BrandãoiteHide

Formula:
BeAl2(PO4)2(OH)2(H2O)5
Colour:
colorless
Lustre:
Vitreous
Hardness:
6
Specific Gravity:
2.353 (Calculated)
Crystal System:
Triclinic
Name:
The mineral is named after Professor Paulo Roberto Gomes Brandão (born January 26, 1944), Department of Mining Engineering, Universidade Federal de Minas Gerais (UFMG).
New structure type.


Classification of BrandãoiteHide

Approved
Approval Year:
2017
First Published:
2019
8.CA.

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
A : With small and large/medium cations

Physical Properties of BrandãoiteHide

Vitreous
Transparency:
Transparent
Colour:
colorless
Comment:
white in aggregates
Streak:
white
Hardness:
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
none
Fracture:
Conchoidal
Density:
2.353 g/cm3 (Calculated)

Optical Data of BrandãoiteHide

Type:
Biaxial (+)
RI values:
nα = 1.544(2) nβ = 1.552(2) nγ = 1.568(2)
2V:
Measured: 69.7° (10), Calculated: 71.2°
Max Birefringence:
δ = 0.024
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of BrandãoiteHide

Formula:
BeAl2(PO4)2(OH)2(H2O)5

Crystallography of BrandãoiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 6.100(4) Å, b = 8.616(4) Å, c = 10.261(5) Å
α = 93.191(11)°, β = 95.120(11)°, γ = 96.863(11)°
Ratio:
a:b:c = 0.708 : 1 : 1.191
Unit Cell V:
532.1 ų
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.772Å(82)
5.243Å(85)
4.982Å(73)
4.268Å(100)
3.846Å(48)
3.091Å(53)
2.789Å(68)
2.712Å(76)

Geological EnvironmentHide

Paragenetic Mode(s):

Type Occurrence of BrandãoiteHide

General Appearance of Type Material:
Acicular crystals less than 10 μm wide and less than 100 μm long that form compact radiating spherical aggregates up to 1.0-1.5 mm across.
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the Department of Natural History, Royal Ontario Museum, 100 Queens Park, Toronto, Ontario M5S 2C6, Canada, catalogue number M57443
Geological Setting of Type Material:
Granite pegmatite
Associated Minerals at Type Locality:
Reference:
Menezes Filho, L.A.D., Chaves, M.L.S.C., Cooper, M.A., Ball, N.A., Abdu, Y.A., Sharpe, R., Day, M.C., Hawthorne, F.C. (2019) Brandãoite, [BeAl2(PO4)2(OH)2(H2O)4](H2O), a new Be–Al phosphate mineral from the João Firmino mine, Pomarolli farm region, Divino das Laranjeiras County, Minas Gerais State, Brazil: description and crystal structure. Mineralogical Magazine: 83(2): 261-267.

Synonyms of BrandãoiteHide

Related Minerals - Nickel-Strunz GroupingHide

8.CA.DavidlloyditeZn3(AsO4)2·4H2O Tric. 1 : P1
8.CA.ApexiteNaMg(PO4)·9H2OTric. 1 : P1
8.CA.05FransoletiteCa3Be2(PO4)2(PO3OH)2 · 4H2OMon.
8.CA.05ParafransoletiteCa3Be2(PO4)2(PO3OH)2 · 4H2OTric. 1 : P1
8.CA.10EhrleiteCa4Be3Zn2(PO4)6 · 9H2OTric. 1 : P1
8.CA.15FaheyiteBe2Mn2+Fe3+2(PO4)4 · 6H2OTrig. 3 2 : P31 2 1
8.CA.20GainesiteNa(Na,K)(Be,Li)Zr2(PO4)4 · 1.5-2H2OTet. 4mm : I41md
8.CA.20MccrillisiteNaCs(Be,Li)Zr2(PO4)4 · 1-2H2OTet. 4/mmm (4/m 2/m 2/m) : I41/amd
8.CA.20SelwyniteNaK(Be,Al)Zr2(PO4)4 · 2H2OTet.
8.CA.25PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2OIso. 2 3 : I2 3
8.CA.30HopeiteZn3(PO4)2 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.CA.30ArsenohopeiteZn3(AsO4)2 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.CA.35WarikahniteZn3(AsO4)2 · 2H2OTric. 1 : P1
8.CA.40PhosphophylliteZn2Fe(PO4)2 · 4H2OMon. 2/m : P21/b
8.CA.45ParascholziteCaZn2(PO4)2 · 2H2OMon.
8.CA.45ScholziteCaZn2(PO4)2 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbcm
8.CA.50KeyiteCu2+3Zn4Cd2(AsO4)6 · 2H2OMon. 2/m
8.CA.55PushcharovskiteK0.6Cu18(AsO4)(HAsO4)10(H2AsO4)4(OH)9.6·18.6H2OTric.
8.CA.60ProsperiteCa2Zn4(AsO4)4 · H2OMon.
8.CA.65GengenbachiteKFe3+3(PO3OH)4[PO2(OH)2]2 · 6H2OTrig. 3m : P3 1c
8.CA.70ParahopeiteZn3(PO4)2 · 4H2OTric. 1 : P1

Fluorescence of BrandãoiteHide

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 BrandãoiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Menezes, L., Chaves, M.L.S.C., Cooper, M.A., Ball, N., Abdu, Y., Sharp, R., Hawthorne, F.C. and Day, M. (2017) Brandãoite, IMA 2016-071a. CNMNC Newsletter No. 39, October 2017, page 1283. Mineralogical Magazine: 81: 1279–1286.
Menezes Filho, L.A.D., Chaves, M.L.S.C., Cooper, M.A., Ball, N.A., Abdu, Y.A., Sharpe, R., Day, M.C., Hawthorne, F.C. (2019) Brandãoite, [BeAl2(PO4)2(OH)2(H2O)4](H2O), a new Be–Al phosphate mineral from the João Firmino mine, Pomarolli farm region, Divino das Laranjeiras County, Minas Gerais State, Brazil: description and crystal structure. Mineralogical Magazine: 83(2): 261-267.

Internet Links for BrandãoiteHide

Localities for BrandãoiteHide

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.
Brazil (TL)
 
  • Minas Gerais
    • Divino das Laranjeiras
      • Linópolis
Menezes Filho, L.A.D., Chaves, M.L.S.C., Cooper, M.A., Ball, N.A., Abdu, Y.A., Sharpe, R., Day, M.C., Hawthorne, F.C. (2019) Brandãoite, [BeAl2(PO4)2(OH)2(H2O)4](H2O), a new Be–Al phosphate mineral from the João Firmino mine, Pomarolli farm region, Divino das Laranjeiras County, Minas Gerais State, Brazil: description and crystal structure. Mineralogical Magazine: 83(2): 261-267.
 
Mineral and/or Locality  
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