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Bandylite

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Formula:
Cu[B(OH)
 
4
]Cl
System:TetragonalColour:Deep blue with greenish ...
Lustre:Vitreous, PearlyHardness:
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 (Queténa Prospect), Toki Cu deposit (Toki Cluster), Chuquicamata District, 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):
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
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)
4.13 (5.5)
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[B(OH)
 
4
]Cl
Simplified for copy/paste:Cu[B(OH)4]Cl
Essential elements:B, Cl, Cu, H, O
All elements listed in formula:B, Cl, Cu, H, O
Analytical 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(BO
 
4
)
6.AC.10Pseudosinhalite
Mg
 
2
Al
 
3
(BO
 
3
)
 
2
(OH)O
 
3
6.AC.15Behierite
(Ta
5+
 
,Nb
5+
 
)(BO
 
4
)
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[B(OH)
 
4
]
 
2
(OH)
 
4
6.AC.40Teepleite
Na
 
2
[B(OH)
 
4
]Cl
6.AC.45Moydite-(Y)
Y[B(OH)
 
4
](CO
 
3
)
6.AC.50Carboborite
Ca
 
2
Mg[B(OH)
 
4
]
 
2
(CO
 
3
)
 
2
· 4H
 
2
O
6.AC.55Sulfoborite
Mg
 
3
[B(OH)
 
4
]
 
2
(SO
 
4
)(OH,F)
 
2
6.AC.60Lüneburgite
Mg
 
3
[B
 
2
(OH)
 
6
](PO
 
4
)
 
2
· 6H
 
2
O
6.AC.65Seamanite
Mn
2+
3
[B(OH)
 
4
](PO
 
4
)(OH)
 
2
6.AC.70Cahnite
Ca
 
2
[B(OH)
 
4
](AsO
 
4
)
Related Minerals - Hey's Index Grouping:

- +
10.1.1Teepleite
Na
 
2
[B(OH)
 
4
]Cl
10.1.3Berborite
Be
 
2
(BO
 
3
)(OH,F) · H
 
2
O
10.1.4Fluoborite
Mg
 
3
(BO
 
3
)(F,OH)
 
3
10.1.5Boracite
Mg
 
3
(B
 
7
O
 
13
)Cl
10.1.6Karlite
Mg
 
7
(BO
 
3
)
 
3
(OH,Cl)
 
5
10.1.7Shabynite
Mg
 
5
(BO
 
3
)(OH)
 
5
(Cl,OH)
 
2
· 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
(B
 
4
O
 
7
)(Cl,OH)
 
2
· 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
(B
 
7
O
 
13
)Cl
10.1.19Congolite
(Fe
2+
 
,Mg)
 
3
(B
 
7
O
 
13
)Cl
10.1.20Ericaite
Fe
2+
3
(B
 
7
O
 
13
)Cl

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.

Internet Links for Bandylite

Search Engines:
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  • External Links:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Bandylite details from Handbook of Mineralogy (PDF)
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  • Localities for Bandylite

    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.
    Chile
     
    • Antofagasta Region
      • Antofagasta Province
        • Cerro Palestina
          • Estación Cerro Negro
    Lukasz Kruszewski
    Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 35
      • El Loa Province
        • Calama
          • Chuquicamata District
            • Toki Cu deposit (Toki Cluster)
    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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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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