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Bandylite

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Formula:
Cu[B(OH)4]Cl
System:
Tetragonal
Colour:
Deep blue with greenish ...
Lustre:
Vitreous, Pearly
Hardness:
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

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
6.AC.35

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

25 : ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
1 : Monoborates
10.1.2

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

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:

Physical Properties of Bandylite

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:
2.81 g/cm3 (Measured)    2.81 g/cm3 (Calculated)

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 Data:
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
Max Birefringence:
δ = 0.051
Image 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
Essential elements:
All elements listed in formula:
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

6.AC.05SinhaliteMgAl(BO4)
6.AC.10PseudosinhaliteMg2Al3(BO3)2(OH)O3
6.AC.15Behierite(Ta5+,Nb5+)(BO4)
6.AC.15Schiavinatoite(Nb,Ta)(BO4)
6.AC.20FroloviteCa[B(OH)4]2
6.AC.25HexahydroboriteCa[B(OH)4]2 · 6H2O
6.AC.30HenmiliteCa2Cu[B(OH)4]2(OH)4
6.AC.40TeepleiteNa2[B(OH)4]Cl
6.AC.45Moydite-(Y)Y[B(OH)4](CO3)
6.AC.50CarboboriteCa2Mg[B(OH)4]2(CO3)2 · 4H2O
6.AC.55SulfoboriteMg3[B(OH)4]2(SO4)(OH,F)2
6.AC.60LüneburgiteMg3[B2(OH)6](PO4)2 · 6H2O
6.AC.65SeamaniteMn32+[B(OH)4](PO4)(OH)2
6.AC.70CahniteCa2[B(OH)4](AsO4)
10.1.1TeepleiteNa2[B(OH)4]Cl
10.1.3BerboriteBe2(BO3)(OH,F) · H2O
10.1.4FluoboriteMg3(BO3)(F,OH)3
10.1.5BoraciteMg3(B7O13)Cl
10.1.6KarliteMg7(BO3)3(OH,Cl)5
10.1.7ShabyniteMg5(BO3)(OH)5(Cl,OH)2 · 4H2O
10.1.8/9/10HilgarditeCa2B5O9Cl · H2O
10.1.11SolongoiteCa2(H3B3O7)(OH)Cl
10.1.12HydrochlorboriteCa4B8O15Cl2 · 21H2O
10.1.13EkateriniteCa2(B4O7)(Cl,OH)2 · 2H2O
10.1.14VolkovskiteKCa4[B5O8OH]4[B(OH)3]2Cl · 4H2O
10.1.15ChelkariteCaMgB2O4(Cl,OH)2 · 5H2O Or near, with Cl:OH = 3:1
10.1.16JohachidoliteCaAlB3O7
10.1.17SatimoliteKNa2Al4[Cl|B2O5]3 · 13H2O
10.1.18ChambersiteMn32+(B7O13)Cl
10.1.19Congolite(Fe2+,Mg)3(B7O13)Cl
10.1.20EricaiteFe32+(B7O13)Cl

Other Names for Bandylite

Name in Other Languages:
German:Bandylit
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 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 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

Localities for Bandylite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Mineral and/or Locality  
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