Bismoclite Mineral Data

General Bismoclite Information

Chemical Formula:

BiOCl

Composition:

Molecular Weight = 260.43 gm

Bismuth 80.24 % Bi 89.46 % Bi₂O₃

Chlorine 13.61 % Cl 13.61 % Cl

- % Cl -3.07 % -O=Cl₂

Oxygen 6.14 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BiOCl

Environment:

In an alluvial specimen, found near bismuth-bearing granite pegmatites.

IMA Status:

Valid Species (Pre-IMA) 1935

Locality:

In South Africa, about 25 km northwest of Jackals Water, near Steinkoph, Cape Province. Link to MinDat.org Location Data.

Name Origin:

In allusion to its composition, a "bismuth oxychloride."

Name Pronunciation:

Bismoclite + Pronunciation

Synonym:

ICSD 74502

PDF 6-249

Bismoclite Image

Images:

Bismoclite

Comments: Opaque white pearly crystalline bismoclite on matrix.
Location: Falcacci Mine, Rio Marina, Elba, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Bismoclite Crystallography

Axial Ratios:

a:c = 1:1.89209

Cell Dimensions:

a = 3.883, c = 7.347, Z = 2; V = 110.78 Den(Calc)= 7.81

Crystal System:

Tetragonal - Ditetragonal Dipyramidal H-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): 3.44(1), 2.677(0.95), 2.753(0.75),

Physical Properties of Bismoclite

Cleavage:

{001} Perfect

Color:

Brown, Colorless, Gray, Yellow, Yellow brown.

Density:

7.717

Diaphaneity:

Transparent to Translucent

Hardness:

2-2.5 - Gypsum-Finger Nail

Luster:

Greasy (Oily)

Streak:

white

Optical Properties of Bismoclite

Gladstone-Dale:

CI meas= 0.258 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.267 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1319,KPDmeas= 0.1335,KC= 0.1799
Ncalc = 2.39 - 2.4

Optical Data:

Uniaxial (-), e=1.91, w=2.15, bire=0.2400.

Calculated Properties of Bismoclite

Electron Density:

Bulk Density (Electron Density)=6.40 gm/cc
note: Specific Gravity of Bismoclite =7.72 gm/cc.

Fermion Index:

Fermion Index = 0.0000302907
Boson Index = 0.9999697093

Photoelectric:

PE_Bismoclite=1,558.04 barns/electron
U=PE_Bismoclite x rElectron Density=9,972.10 barns/cc.

Radioactivity:

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

Bismoclite Classification

Dana Class:

10.02.01.02 (10)Oxyhalides and Hydroxyhalides

(10.02)where A (O,OH) Xq

(10.02.01)Bismoclite Group

10.02.01.01 Zavaritskite BiOF P 4/nmm 4/m 2/m 2/m

10.02.01.02 Bismoclite BiOCl P 4/nmm 4/m 2/m 2/m

10.02.01.03 Daubreeite BiO(OH,Cl) P 4/nmm 4/m 2/m 2/m

Strunz Class:

03.DC.25 03 - HALIDES

03.D - Oxyhalides, Hydroxyhalides and Related Double Halides

03.DC -With Pb (As,Sb,Bi), without Cu

03.DC.25 Bismoclite BiOCl P 4/nmm 4/m 2/m 2/m

03.DC.25 Daubreeite BiO(OH,Cl) P 4/nmm 4/m 2/m 2/m

03.DC.25 Matlockite PbFCl P 4/nmm 4/m 2/m 2/m

03.DC.25 Rorisite (Ca,Mg)FCl P 4/nmm 4/m 2/m 2/m

03.DC.25 Zavaritskite BiOF P 4/nmm 4/m 2/m 2/m

03.DC.25 Zhangpeishanite! BaFCl P 4/mmm 4mm

Other Bismoclite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Bismoclite :
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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Bismoclite

BiOCl
Dana No: 10.02.01.02 Strunz No: 03.DC.25
Locality:

Notes:

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