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About BandyliteHide

Mark C. Bandy
Deep blue with greenish portions; cendre blue to Italian blue, becoming greener with atacamite inclusions; blue in transmitted light.
Vitreous, Pearly
Specific Gravity:
Crystal System:
Named in honor of Mark Chance Bandy (22 July 1900, Redfield, Iowa, USA - 3 June 1963), American mining engineer, mineralogist and mineral collector, who first collected the mineral. He worked at many different places over his career, especially in South America. The mineral jeanbandyite is named for his wife.
A water-soluble mineral. It alters readily to Eriochalcite upon exposure to air.

Classification of BandyliteHide

Approved, 'Grandfathered' (first described prior to 1959)
First Published:

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

1 : Monoborates

10 : Borates with other anions
1 : Borates with halide

Physical Properties of BandyliteHide

Vitreous, Pearly
Deep blue with greenish portions; cendre blue to Italian blue, becoming greener with atacamite inclusions; blue in transmitted light.
Pale blue
2½ on Mohs scale
on {001}.
2.81 g/cm3 (Measured)    2.81 g/cm3 (Calculated)

Optical Data of BandyliteHide

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:
O = Deep cendre blue
E = Light greenish yellow

Chemical Properties of BandyliteHide

IMA Formula:
Common Impurities:

Crystallography of BandyliteHide

Crystal System:
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
Cell Parameters:
a = 6.19 Å, c = 5.61 Å
a:c = 1 : 0.906
Unit Cell V:
214.95 ų (Calculated from Unit Cell)
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 DiffractionHide

Powder Diffraction Data:
5.59 Å(10)
3.08 Å(8)
2.54 Å(8)
1.952 Å(7)
4.35 Å(6)
1.655 Å(6)
4.13 Å(5.5)
Recorded on material from Queténa Mine, Chile

Type Occurrence of BandyliteHide

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)
Geological Setting of Type Material:
In a leached zone above massive iron sulphates
Associated Minerals at Type Locality:
Palache, C., Foshag, W.F. (1938) Antofagastite and bandylite, two new copper minerals from Chile. American Mineralogist: 23: 85-90.

Other Language Names for BandyliteHide


Common AssociatesHide

Associated Minerals Based on Photo Data:
5 photos of Bandylite associated with Betpakdalite-NaCa[Na2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O34(OH)3]
4 photos of Bandylite associated with HexahydriteMgSO4 · 6H2O
4 photos of Bandylite associated with NitratineNaNO3
4 photos of Bandylite associated with BloediteNa2Mg(SO4)2 · 4H2O
2 photos of Bandylite associated with EriochalciteCuCl2 · 2H2O

Related Minerals - Nickel-Strunz GroupingHide

6.AC.05SinhaliteMgAl(BO4)Orth. mmm (2/m 2/m 2/m) : Pnma
6.AC.15Béhierite(Ta5+,Nb5+)(BO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
6.AC.15Schiavinatoite(Nb,Ta)(BO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
6.AC.25HexahydroboriteCa[B(OH)4]2 · 2H2O or CaB2O4 · 6H2OMon. 2/m : B2/b
6.AC.40TeepleiteNa2[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
6.AC.45Moydite-(Y)Y[B(OH)4](CO3)Orth. mmm (2/m 2/m 2/m) : Pbca
6.AC.50CarboboriteCa2Mg[B(OH)4]2(CO3)2 · 4H2OMon.
6.AC.55SulfoboriteMg3[B(OH)4]2(SO4)(OH,F)2Orth. mm2
6.AC.60LüneburgiteMg3[B2(OH)6](PO4)2 · 6H2OTric.
6.AC.65SeamaniteMn2+3[B(OH)4](PO4)(OH)2Orth. mmm (2/m 2/m 2/m)
6.AC.70CahniteCa2[B(OH)4](AsO4)Tet. 4 : P4

Related Minerals - Dana Grouping (8th Ed.)Hide[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

10.1.1TeepleiteNa2[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
10.1.3BerboriteBe2(BO3)(OH,F) · H2OTrig.
10.1.5BoraciteMg3(B7O13)ClOrth. mm2 : Pca21
10.1.7ShabyniteMg5(BO3)(OH)5(Cl,OH)2 · 4H2OMon.
10.1.8/9/10HilgarditeCa2B5O9Cl · H2OTric. 1 : P1
10.1.12HydrochlorboriteCa4B8O15Cl2 · 21H2OMon.
10.1.13EkateriniteCa2(B4O7)(Cl,OH)2 · 2H2OHex.
10.1.14VolkovskiteKCa4[B5O8OH]4[B(OH)3]2Cl · 4H2OTric. 1 : P1
10.1.15ChelkariteCaMgB2O4(Cl,OH)2 · 5H2O Or near, with Cl:OH = 3:1Orth.
10.1.16JohachidoliteCaAlB3O7Orth. mmm (2/m 2/m 2/m) : Cmma
10.1.17SatimoliteKNa2(Al5Mg2)[B12O18(OH)12](OH)6Cl4·4H2OTrig. 3m (3 2/m) : R3m
10.1.18ChambersiteMn2+3(B7O13)ClOrth. mm2 : Pca21
10.1.19Congolite(Fe2+,Mg)3(B7O13)ClTrig. 3m : R3c

Other InformationHide

IR Spectrum:
Cerro Palestina material [cm-1]: 3430sh, 3395s, 3310sh, 1257s, 1078, 912s, 636, 601, 504, 402w
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 BandyliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Palache, C., Foshag, W.F. (1938) Antofagastite and bandylite, two new copper minerals from Chile. American Mineralogist: 23: 85-90.
Bandy, M.C. (1938) Mineralogy of three sulphate deposits of Northern Chile. American Mineralogist: 23: 669-760.
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.
Li, Y., Burns, P.C. (2000) Refinement of the structure of bandylite. The Canadian Mineralogist: 38: 713-715.
Chukanov, N.V. (2014) Infrared spectra of mineral species: Extended library. Springer (Springer Geochemistry/Mineralogy), vol. 1, Dordrecht, 1726 pp.

Internet Links for BandyliteHide

Localities for BandyliteHide

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.
  • Yukon
    • Watson Lake mining district
Liverton, T., 2016. A-type granite plutons and tin skarns in southeast Yukon: Mindy prospect and surrounding granite of 105C/9. In: Yukon Exploration and Geology 2015, K.E. MacFarlane and M.G. Nordling (eds.), Yukon Geological Survey, p. 151-164.
  • Antofagasta
    • 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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