Bandylite Mineral Data

Bandylite Mineral Data +

General Bandylite Information

Chemical Formula:

CuB(OH)4Cl

Composition:

Molecular Weight = 177.84 gm

Copper 35.73 % Cu 44.73 % CuO

Boron 6.08 % B 19.57 % B₂O₃

Hydrogen 2.27 % H 20.26 % H₂O

Chlorine 19.94 % Cl 19.94 % Cl

- % Cl -4.50 % -O=Cl₂

Oxygen 35.99 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CuB(OH)₄Cl

IMA Status:

Valid Species (Pre-IMA) 1938

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 30610

PDF 12-631

Bandylite Image

Images:

Bandylite

Comments: Blue crystals of bandylite on quartz.
Location: Quet?na mine, Calama, Antofag?sta Province, Chile. Scale: 8x5x3 cm.
© John Betts - Fine Minerals

Bandylite Crystallography

Axial Ratios:

a:c = 1:0.90879

Cell Dimensions:

a = 6.14, c = 5.58, Z = 2; V = 210.36 Den(Calc)= 2.81

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/nmm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 5.59(1), 2.54(0.8), 3.08(0.8),

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Crystal Structure:

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Li Y , Burns P C , The Canadian Mineralogist , 38 (2000) p.713-715, Refinement of the structure of bandylite

View Additional jPOWD Structure files for Bandylite
[1]

Physical Properties of Bandylite

Cleavage:

[001] Perfect

Color:

Dark blue.

Density:

2.81

Diaphaniety:

Translucent

Fracture:

Flexible - Flexible fragments.

Hardness:

2.5 - Finger Nail

Luster:

Vitreous - Pearly

Streak:

light blue

Optical Properties of Bandylite

Gladstone-Dale:

CI meas= 0.052 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.052 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.237,KPDmeas= 0.237,KC= 0.25

Optical Data:

Uniaxial (?), a=1.641, b=1.691, bire=0.0500.

Calculated Properties of Bandylite

Electron Density:

r_electron=2.75 gm/cc
note: r_Bandylite=2.81 gm/cc.

Fermion Index

Fermion Index = 0.01227
Boson Index = 0.98773

Photoelectric:

PE_Bandylite= 16.81 barns/electron
U=PE_Bandylite x r_electron= 46.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bandylite is Not Radioactive

Bandylite Classification

Dana Class:

25.1.4.2 (25)Anhydrous Borates Containing Hydroxyl or Halogen

(25.1)Dana Type

(25.1.4)Dana Group

25.1.4.1 Teepleite Na2B(OH)4Cl P 4/nmm 4/m 2/m 2/m

25.1.4.2 Bandylite CuB(OH)4Cl P 4/nmm 4/m 2/m 2/m

Strunz Class:

V/G.08-10 V - Nitrates, Carbonates and Borates

V/G - "Insel" borates [BO4]5- tetraheders

V/G.08 - Bandylite - Cahnite

V/G.08-10 Bandylite CuB(OH)4Cl P 4/nmm 4/m 2/m 2/m

V/G.08-20 Teepleite Na2B(OH)4Cl P 4/nmm 4/m 2/m 2/m

V/G.08-30 Cahnite Ca2B(AsO4)(OH)4 I 4 4

Other Bandylite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Bandylite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Print or Cut-and-Paste your Bandylite Specimen Label here :

Bandylite

CuB(OH)4Cl
Dana No: 25.1.4.2 Strunz No: V/G.08-10
Locality:

Notes: