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Bandylite

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Queténa Mine, Calama, El Loa Province, Antofagasta Region, Chile
© 2003 John H. Betts

Show Bandylite Photos (3)
Formula:
Cu[Cl|B(OH)
 
4
]
System:TetragonalColour:Deep blue with greenish ...
Lustre:Vitreous, PearlyHardness:2½
Name:For Dr. Mark Chance Bandy (1900-1963), American mining engineer, mineralogist and mineral collector, who first collected the mineral.


A water-soluble mineral. It alters readily to Eriochalcite upon exposure to air.

Classification of Bandylite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:5/G.08-10
Nickel-Strunz 10th (pending) edition ID:6.AC.35

6 : BORATES
A : Monoborates
C : B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc
Dana 8th edition ID:25.1.4.2

25 : ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
1 : Monoborates
Hey's CIM Ref.:10.1.2

10 : Borates with other anions
1 : Borates with halide
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Type Occurrence of Bandylite

Type Locality:Queténa Mine, Calama, El Loa Province, Antofagasta Region, Chile
General Appearance of Type Material:Tabular or pyramidal crystals to 5 mm and almost lichen-like radial clusters in joints in the rock.
Place of Conservation of Type Material:National Museum of Natural History, Washington, D.C., USA (No. C5459)
Year of Discovery:1938
Geological Setting of type material:In a leached zone above massive iron sulphates
Associated Minerals at type locality:
EriochalciteAtacamite

Physical Properties of Bandylite

Lustre:Vitreous, Pearly
Diaphaneity (Transparency):Transparent
Colour:Deep blue with greenish portions; cendre blue to Italian blue, becoming greener with atacamite inclusions; blue in transmitted light.
Streak:Pale blue
Hardness (Mohs):2½
Tenacity:Elastic
Cleavage:Perfect
on {001}.
Density (measured):2.81 g/cm3
Density (calculated):2.81 g/cm3

Crystallography of Bandylite

Crystal System:Tetragonal
Class (H-M):4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:P4/nmm (P4/n 21/m 2/m)
Cell Parameters:a = 6.19Å, c = 5.61Å
Ratio:a:c = 1 : 0.906
Unit Cell Volume:V 214.95 ų (Calculated from Unit Cell)
Z:2
Morphology:Crystals typically tabular on {001} or equant with large {001}, {201}, and {110}, having quadrangular terraces on {001}. dominant forms are {001}, {111}, {201} and {110}. Occurs as subparallel clusters forming lichen-like groups with the individual crystals flattened on the base or on a pyramidal face.
X-Ray Powder Diffraction:
d-spacingIntensity
5.59 (10)
3.08 (8)
2.54 (8)
1.952 (7)
4.35 (6)
1.655 (6)
Comments:Recorded on material from Queténa Mine, Chile

Optical Data of Bandylite

Type:Uniaxial (-)
RI values: nω = 1.691 - 1.692 nε = 1.640 - 1.641
Maximum Birefringence:δ = 0.051

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Pleochroism:Strong
Comments:O = Deep cendre blue
E = Light greenish yellow

Chemical Properties of Bandylite

Formula:
Cu[Cl|B(OH)
 
4
]
Essential elements:B, Cl, Cu, H, O
All elements listed in formula:B, Cl, Cu, H, O
Analyical Data:Analysis of material from Queténa Mine, Chile
Cu (34.94)
B2O4 (23.35)
Fe2O3 (0.35)
MgO (0.05)
CaO (0.05)
Na2O (0.40)
Cl (19.47)
H2O (19.60)
SO3 (0.05)
insol. (1.84)

sum 100.10 wt.-%
Common Impurities:Fe

Relationship of Bandylite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
6.AC.05Sinhalite
MgAl[O|BO
 
3
]
6.AC.10Pseudosinhalite
Mg
 
2
Al
 
3
[O
 
3
|OH|(BO
 
3
)
 
2
]
6.AC.15Behierite
(Ta
5+
 
,Nb
5+
 
)[O|BO
 
3
]
6.AC.15Schiavinatoite
(Nb,Ta)BO
 
4
6.AC.20Frolovite
Ca[B(OH)
 
4
]
 
2
6.AC.25Hexahydroborite
Ca[B(OH)
 
4
]
 
2
 · 6H
 
2
O
6.AC.30Henmilite
Ca
 
2
Cu[(OH)
 
2
|B(OH)
 
4
]
 
2
6.AC.40Teepleite
Na
 
2
[Cl|B(OH)
 
4
]
6.AC.45Moydite-(Y)
Y[CO
 
3
|B(OH)
 
4
]
6.AC.50Carboborite
Ca
 
2
Mg[CO
 
3
|B(OH)
 
4
]
 
2
 · 4H
 
2
O
6.AC.55Sulfoborite
Mg
 
3
[(OH,F)
 
2
|SO
 
4
|{B(OH)
 
4
}
 
2
]
6.AC.60Lüneburgite
Mg
 
3
B
 
2
(PO
 
4
)
 
2
(OH)
 
6
·6H
 
2
O
6.AC.65Seamanite
Mn
2+
3
[(OH)
 
2
|PO
 
4
|B(OH)
 
4
]
6.AC.70Cahnite
Ca
 
2
[AsO
 
4
|B(OH)
 
4
]
Related Minerals - Hey's Index Grouping:

- +
10.1.1Teepleite
Na
 
2
[Cl|B(OH)
 
4
]
10.1.3Berborite
Be
 
2
[(OH,F)|BO
 
3
] · H
 
2
O
10.1.4Fluoborite
Mg
 
3
[(F,OH)
 
3
|BO
 
3
]
10.1.5Boracite
Mg
 
3
[Cl|B
 
7
O
 
13
]
10.1.6Karlite
Mg
 
7
[(OH,Cl)
 
5
|(BO
 
3
)
 
3
]
10.1.7Shabynite
Mg
 
5
[(Cl,OH)
 
2
|(OH)
 
5
|BO
 
3
] · 4H
 
2
O
10.1.8/9/10Hilgardite
Ca
 
2
B
 
5
O
 
9
Cl·H
 
2
O
10.1.11Solongoite
Ca
 
2
(H
 
3
B
 
3
O
 
7
)(OH)Cl
10.1.12Hydrochlorborite
Ca
 
4
B
 
8
O
 
15
Cl
 
2
·21H
 
2
O
10.1.13Ekaterinite
Ca
 
2
[(Cl,OH)
 
2
|B
 
4
O
 
7
] · 2H
 
2
O
10.1.14Volkovskite
KCa
 
4
[B
 
5
O
 
8
OH]
 
4
[B(OH)
 
3
]
 
2
Cl·4H
 
2
O
10.1.15Chelkarite
CaMgB
 
2
O
 
4
(Cl,OH)
 
2
·5H
 
2
O Or near, with Cl:OH = 3:1
10.1.16Johachidolite
CaAlB
 
3
O
 
7
10.1.17Satimolite
KNa
 
2
Al
 
4
[Cl|B
 
2
O
 
5
]
 
3
 · 13H
 
2
O
10.1.18Chambersite
Mn
2+
3
[Cl|B
 
7
O
 
13
]
10.1.19Congolite
(Fe
2+
 
,Mg)
 
3
B
 
7
O
 
13
Cl
10.1.20Ericaite
Fe
2+
3
[Cl|B
 
7
O
 
13
]

Other Names for Bandylite

Other Languages:
German:Bandylit
Russian:Бандилит
Spanish:Bandylita

Other Information

Other Information:Decomposed by water, leaving a residue of green copper borate. Readily soluble in NH4OH, to an intense blue solution. Less readily soluble in HCl or HNO3.
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 Bandylite

Reference List:Palache, C. and Foshag (1938) American Mineralogist: 23: 85.

Fornaseri, M. (1950): La struttura cristallina della bandylite. Periodico di Mineralogia, Roma, 157-179 (in Italian).

Palache, C., Berman, H. and Frondel, C. (1951): Dana's system of mineralogy, 7th ed., Vol. 2, 373-374.

Collin, R. L. (1951): The crystal structure of bandylite, CuCl2.CuB2O4.4H2O. Acta Crystallographica 4, 204-209.

Ross, V. and Edwards, J. O. (1959): Tetrahedral boron in teepleite and bandylite. American Mineralogist 44, 875-877.

Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 35.

Articles/Blogs about Bandylite

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    Localities for Bandylite

    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.
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    (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.
    Chile
     
    • Antofagasta Region
      • Antofagasta Province
    		Lukasz Kruszewski
    Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 35
      • El Loa Province
        • Calama
    		Palache & Foshag (1938); Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 45, 374; American Mineralogist (1959): 44: 875.
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