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Bulachite

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About BulachiteHide

Formula:
Al2(AsO4)(OH)3 · 3H2O
Hardness:
2
Crystal System:
Orthorhombic
Name:
Named for the type locality at Neubulach, Baden-Württemberg,
Germany.
A rare secondary Al arsenate hydrate.

Grey et al. (2020) show that bulachite from Cap Garonne has the formula Al6(AsO4)3(OH)9(H2O)4⋅2H2O and is intergrown with a a higher hydrate with composition Al6(AsO4)3(OH)9(H2O)4⋅8H2O.


Classification of BulachiteHide

Approved
Approval Year:
1982
8.DE.15

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
E : With only medium-sized cations, (OH, etc.):RO4 = 3:1
42.6.7.2

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
6 : A2(XO4)Zq·xH2O
20.4.2

20 : Arsenates (also arsenates with phosphate, but without other anions)
4 : Arsenates of Group III metals (Al, rare earths)

Physical Properties of BulachiteHide

Hardness:

Optical Data of BulachiteHide

Type:
Biaxial (-)
RI values:
nα = 1.540 nβ = 1.546 nγ = 1.548
2V:
Measured: 66° , Calculated: 58°
Max Birefringence:
δ = 0.008
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r > v

Chemical Properties of BulachiteHide

Formula:
Al2(AsO4)(OH)3 · 3H2O

Crystallography of BulachiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Cell Parameters:
a = 15.3994(3) Å, b = 17.6598(3) Å, c = 7.8083(1) Å
Ratio:
a:b:c = 0.872 : 1 : 0.442
Unit Cell V:
2,123.47 ų (Calculated from Unit Cell)
Comment:
Cell from Grey et al. (2020). Cell of type material: a = 15.53, b = 17.78, c = 7.03 Å.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.78 Å(100)
3.49 Å(80)
8.97 Å(70)
6.55 Å(70)
5.92 Å(70)
3.75 Å(70)
2.73 Å(60)

Type Occurrence of BulachiteHide

Synonyms of BulachiteHide

Other Language Names for BulachiteHide

German:Bulachit
Spanish:Bulachita

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Bulachite associated with MansfielditeAlAsO4 · 2H2O

Related Minerals - Nickel-Strunz GroupingHide

8.DE.05SenegaliteAl2(PO4)(OH)(OH)2 · H2OOrth. mm2
8.DE.10FluelliteAl2(PO4)F2(OH) · 7H2OOrth. mmm (2/m 2/m 2/m) : Fddd
8.DE.20ZapataliteCu3Al4(PO4)3(OH)9 · 4H2OTet.
8.DE.25CeruleiteCu2Al7(AsO4)4(OH)13 · 11.5H2OTric.
8.DE.35AldermaniteMg5Al12(PO4)8(OH)22 · 32H2OOrth.
8.DE.40Juanitaite(Cu,Ca,Fe)10Bi(AsO4)4(OH)11 · 2H2OTet. 4/mmm (4/m 2/m 2/m) : P42/nnm
8.DE.45IangreyiteCa2Al7(PO4)2(PO3OH)2(OH,F)15 · 8H2OTrig. 3 2 : P3 2 1

Related Minerals - Dana Grouping (8th Ed.)Hide

42.6.7.1SenegaliteAl2(PO4)(OH)(OH)2 · H2OOrth. mm2

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

20.4.1MansfielditeAlAsO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
20.4.3PharmacoalumiteKAl4(AsO4)3(OH)4 · 6.5H2OIso. 4 3m : P4 3m
20.4.4LuetheiteCu2Al2(AsO4)2(OH)4Mon. 2/m : P21/m
20.4.5ArsenogoyaziteSrAl3(AsO4)(AsO3OH)(OH)6Trig. 3m (3 2/m) : R3m
20.4.6ArsenocrandalliteCaAl3(AsO4)(AsO3OH)(OH)6Trig. 3m (3 2/m)
20.4.7Arsenoflorencite-(Ce)CeAl3(AsO4)2(OH)6Trig. 3m (3 2/m) : R3m
20.4.8Arsenoflorencite-(La)LaAl3(AsO4)2(OH)6Trig. 3m (3 2/m) : R3m
20.4.9Arsenoflorencite-(Nd)NdAl3(AsO4)2(OH)6Trig.
20.4.10Gerdtremmelite(Zn,Fe)(Al,Fe)2(AsO4)(OH)5Tric.
20.4.11Gasparite-(Ce)Ce(AsO4)Mon. 2/m : P21/m
20.4.12Chernovite-(Y)Y(AsO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
20.4.13Agardite-(Y)YCu6(AsO4)3(OH)6 · 3H2OHex. 6/m : P63/m
20.4.14Agardite-(La)LaCu6(AsO4)3(OH)6 · 3H2OHex. 6/m
20.4.15GoudeyiteAlCu6(AsO4)3(OH)6 · 3H2OHex.
20.4.16Retzian-(Ce)Mn2+2Ce(AsO4)(OH)4Orth. mmm (2/m 2/m 2/m) : Pban
20.4.17Retzian-(La)(Mn2+,Mg)2(La,Ce,Nd)(AsO4)(OH)4Orth. mmm (2/m 2/m 2/m) : Pban
20.4.18Retzian-(Nd)Mn2+2(Nd,Ce,La)(AsO4)(OH)4Orth. mmm (2/m 2/m 2/m) : Pban

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 BulachiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Walenta, K. (1979): The secondary minerals of the ore veins of Neubulach, northern Black Forest. Aufschluss: 30: 213-252 (in German); in: Fleischer, M., Mandarino, J.A., Pabst, A. (1980): New mineral names. American Mineralogist: 65: 209
Walenta, K. (1983): Bulachit, ein neues Aluminiumarsenatmineral von Neubulach im nördlichen Schwarzwald. Aufschluss, 34, 445-451. [Abs. in American Mineralogist: 70: 214]
Frau, F. & Da Pelo, S. (2001): Bulachite, a rare aluminium arsenate from Sardinia, Italy: the second world occurrence. Neues Jahrb. Mineral., Monatsh. 2001, 18-26.
Anthony, J.W., Bideaux, R.A., Bladh, K.W. and Nichols, M.C., Eds. Handbook of Mineralogy, Mineralogical Society of America, Chantilly, VA 20151-1110, USA. http://www.handbookofmineralogy.org/ (2016
Ian E. Grey, Emre Yoruk, Stéphanie Kodjikian, Holger Klein, Catherine Bougerol, Helen E.A. Brand, Pierre Bordet, William G. Mumme, Georges Favreau, Stuart J. Mills (2020): Bulachite, [Al6(AsO4)3(OH)9(H2O)4]⋅2H2O from Cap Garonne, France: Crystal structure and formation from a higher hydrate. Mineralogical Magazine 84, 608-615.

Internet Links for BulachiteHide

Localities for BulachiteHide

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.
France
 
  • Provence-Alpes-Côte d'Azur
    • Var
      • Le Pradet
Book : Cap Garonne_AAMCG / AFM. May 2014. ISBN: 978-2-95266-011-5; Ian E. Grey, Emre Yoruk, Stéphanie Kodjikian, Holger Klein, Catherine Bougerol, Helen E.A. Brand, Pierre Bordet, William G. Mumme, Georges Favreau, Stuart J. Mills (2020): Bulachite, [Al6(AsO4)3(OH)9(H2O)4]⋅2H2O from Cap Garonne, France: Crystal structure and formation from a higher hydrate. Mineralogical Magazine 84, 608-615.
Germany (TL)
 
  • Baden-Württemberg
    • Karlsruhe Region
      • Calw
Walenta, K. (1983): Bulachit, ein neues Aluminiumarsenatmineral von Neubulach im nördlichen Schwarzwald. Aufschluss, 34, 445-451. [Abs. in American Mineralogist: 70: 214]
  • Hesse
    • Kassel Region
      • Hersfeld-Rotenburg
        • Nentershausen
          • Süß
            • Richelsdorf Smelter
S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1992
Italy
 
  • Sardinia
    • Metropolitan City of Cagliari
      • Sarroch
        • Sa Bidda Beccia
Frau, F. & Da Pelo, S. (2001): Bulachite, a rare aluminium arsenate from Sardinia, Italy: the second world occurrence. Neues Jahrb. Mineral., Monatsh. 2001, 18-26.
UK
 
  • England
    • Cornwall
      • St Hilary
http://collections.museumvictoria.com.au/object.php?irn=37102; Grey, I.E., Betterton, J., Kampf, A.R., Macrae, C.M., Shanks, F.L., Price, J.R. (2016) Penberthycroftite, [Al₆(AsO₄)₃(OH)₉ (H₂O)₅ ]·8H₂O, a second new hydrated aluminium arsenate mineral from the Penberthy Croft mine, St. Hilary, Cornwall, UK. Mineralogical Magazine, 80:7, 1149-1160.
 
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