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Bulachite

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Sa Malesa, Sarroch, Cagliari Province, Sardinia, Italy
© luigi chiappino

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Formula:
Al
 
2
[(OH)
 
3
|AsO
 
4
] · 3H
 
2
O
System:OrthorhombicHardness:2
This page provides mineralogical data about Bulachite.

Classification of Bulachite

IMA status:Approved 1982
Strunz 8th edition ID:7/D.18-20
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:42.6.7.2

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

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

Type Locality:Neubulach, Calw, Black Forest, Baden-Württemberg, Germany
Year of Discovery:1983

Physical Properties of Bulachite

Hardness (Mohs):2

Crystallography of Bulachite

Crystal System:Orthorhombic
Cell Parameters:a = 15.53Å, b = 17.78Å, c = 7.03Å
Ratio:a:b:c = 0.873 : 1 : 0.395
Unit Cell Volume:V 1,941.15 ų (Calculated from Unit Cell)

Optical Data of Bulachite

Type:Biaxial (-)
RI values: nα = 1.540 nβ = 1.546 nγ = 1.548
2V:Measured: 66° , Calculated: 58°
Maximum Birefringence:δ = 0.008

Chart 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 Bulachite

Formula:
Al
 
2
[(OH)
 
3
|AsO
 
4
] · 3H
 
2
O
Essential elements:Al, As, H, O
All elements listed in formula:Al, As, H, O

Relationship of Bulachite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.DE.05Senegalite
Al
 
2
[(OH)
 
3
|PO
 
4
] · H
 
2
O
8.DE.10Fluellite
Al
 
2
[F
 
2
|OH|PO
 
4
] · 7H
 
2
O
8.DE.20Zapatalite
Cu
 
3
Al
 
4
[(OH)
 
3
|PO
 
4
]
 
3
 · 4H
 
2
O
8.DE.25Ceruleite
Cu
 
2
Al
 
7
[(OH)
 
13
|(AsO
 
4
)
 
4
] · 11.5H
 
2
O
8.DE.35Aldermanite
Mg
 
5
Al
 
12
[(OH)
 
11
|(PO
 
4
)
 
4
]
 
2
 · 32H
 
2
O
8.DE.40Juanitaite
Bi(Cu,Ca,Fe)
 
10
[(OH)
 
11
|(AsO
 
4
)
 
4
] · 2H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
20.4.1Mansfieldite
AlAsO
 
4
·2H
 
2
O
20.4.3Alumopharmacosiderite
KAl
 
4
[(OH)
 
4
|(AsO
 
4
)
 
3
] · 6-7H
 
2
O
20.4.4Luetheite
Cu
 
2
Al
 
2
[(OH)
 
2
|AsO
 
4
]
 
2
20.4.5Arsenogoyazite
SrAl
 
3
[(OH)
 
5
|(AsO
 
4
)
 
2
] · H
 
2
O
20.4.6Arsenocrandallite
(Ca,Sr)Al
 
3
[(OH)
 
5
|(AsO
 
4
,PO
 
4
)
 
2
] · H
 
2
O
20.4.7Arsenoflorencite-(Ce)
CeAl
 
3
[(OH)
 
6
|(AsO
 
4
)
 
2
]
20.4.8Arsenoflorencite-(La)
LaAl
 
3
[(OH)
 
6
|(AsO
 
4
)
 
2
]
20.4.9Arsenoflorencite-(Nd)
NdAl
 
3
[(OH)
 
6
|(AsO
 
4
)
 
2
]
20.4.10Gerdtremmelite
(Zn,Fe)(Al,Fe)
 
2
AsO
 
4
(OH)
 
5
20.4.11Gasparite-(Ce)
(Ce,REE)AsO
 
4
20.4.12Chernovite-(Y)
YAsO
 
4
20.4.13Agardite-(Y)
(Y,Ca)Cu
 
6
[(OH)
 
6
|(AsO
 
4
,HAsO
 
4
)|(AsO
 
4
)
 
2
] · 3H
 
2
O
20.4.14Agardite-(La)
(La,Ce)Cu
 
6
[(OH)
 
6
|(AsO
 
4
)
 
3
] · 3H
 
2
O
20.4.15Goudeyite
(Al,Y)Cu
 
6
[(OH)
 
6
|(AsO
 
4
)
 
3
] · 3H
 
2
O
20.4.16Retzian-(Ce)
Mn
2+
2
Ce(AsO
 
4
)(OH)
 
4
20.4.17Retzian-(La)
(Mn
2+
 
,Mg)
 
2
(La,Ce,Nd)(AsO
 
4
)(OH)
 
4
20.4.18Retzian-(Nd)
Mn
2+
2
(Nd,Ce,La)(AsO
 
4
)(OH)
 
4

Other Names for Bulachite

Synonyms:
IMA1982-081
Other Languages:
German:Bulachit
Spanish:Bulachita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Bulachite

Reference List:American Mineralogist: 70: 214.

Internet Links for Bulachite

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    Localities for Bulachite

    Hide Locality List
    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Germany
     
    • Baden-Württemberg
      • Black Forest
        • Calw
    		American Mineralogist: 70: 214
    • Hesse
      • North Hesse
        • Richelsdorf District
          • Süss
            • Richelsdorf Smelter
    		S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1992
    Italy
     
    • Sardinia
      • Cagliari Province
        • Sarroch
    		Frau, F., Da Pelo, S., (2001): Bulachite, a rare aluminium arsenate from Sardinia, Italy: the second world occurrence. N.Jb. Miner.Mh., Stutgart, 18 - 26 pp
    Mineral and/or Locality
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