Bandylite Mineral Data

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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

Environment:

Secondary origin, in a leached zone above massive iron sulfates.

IMA Status:

Valid Species (Pre-IMA) 1938

Locality:

Quetena, west of Calama, and near Taltal, Antofagasta, Chile. Link to MinDat.org Location Data.

Name Origin:

Named for Mark Chance Bandy (1900-1963), American mining engineer, mineralogist, and mineral collector, who first collected the mineral.

Name Pronunciation:

Bandylite + Pronunciation

Synonym:

ICSD 30610

PDF 12-631

Bandylite Image

Images:

Bandylite

Comments: Blue crystals of bandylite on quartz.
Location: Queténa mine, Calama, Antofagásta 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),

Forms:

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Forms: ( 0 1 1) ( 0 1 2) ( 1 1 1) ( 1 1 0) ( 2 2 1) ( 0 2 1) ( 1 0 0) ( 0 0 1)

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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

Diaphaneity:

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
Ncalc = 1.7

Optical Data:

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

Calculated Properties of Bandylite

Electron Density:

Bulk Density (Electron Density)=2.75 gm/cc
note: Specific Gravity of Bandylite =2.81 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Bandylite= 16.81 barns/electron
U=PE_Bandylite x rElectron Density= 46.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bandylite is Not Radioactive

Bandylite Classification

Dana Class:

25.01.04.02 (25)Anhydrous Borates Containing Hydroxyl or Halogen

(25.01)Dana Type

(25.01.04)Dana Group

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

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

Strunz Class:

06.AC.35 06 - BORATES

06.A - Monoborates

06.AC -B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc.

06.AC.35 Bandylite CuB(OH)4Cl P 4/nmm 4/m 2/m 2/m

Other Bandylite Information

References:

NAME( AntBidBlaNic5) 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Translate Bandylite Mineral Data :

Ask about Bandylite here :
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Rockhounds Discussion Group on Yahoo Groups
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Print or Cut-and-Paste your Bandylite Specimen Label here :

Bandylite

CuB(OH)4Cl
Dana No: 25.01.04.02 Strunz No: 06.AC.35
Locality:

Notes: