Schwartzembergite Mineral Data

General Schwartzembergite Information

Chemical Formula:

Pb++6(IO3)2O3Cl4

Composition:

Molecular Weight = 1,782.81 gm

Lead 69.73 % Pb 75.12 % PbO

Iodine 14.24 % I 18.72 % I₂O₅

Chlorine 7.95 % Cl 7.95 % Cl

- % Cl -1.79 % -O=Cl₂

Oxygen 8.08 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₆(IO₃)₂O₃Cl₄

Environment:

Oxidized lead ores in areas which host caliche nitrate deposits.

IMA Status:

Valid Species (Pre-IMA) 1864

Locality:

Cerro Grodo and various other points in northern Chile. Link to MinDat.org Location Data.

Name Origin:

Named for H. Schwartzemberg, assayer, Copiapo, Chile.

Name Pronunciation:

Schwartzembergite + Pronunciation

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Schwartzembergite Crystallography

Axial Ratios:

a:c = 1:2.23529

Cell Dimensions:

a = 5.61, c = 12.54, Z = 1; V = 394.66 Den(Calc)= 7.50

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4/mmm

Crystal Structure:

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Welch M D , Hawthorne F C , Cooper M A , Kyser T K , The Canadian Mineralogist , 39 (2001) p.785-795, Trivalent iodine in the crystal structure of schwartzembergite, Pb5IO6H2Cl3

Physical Properties of Schwartzembergite

Cleavage:

{001} Distinct

Color:

Yellow brown, Light yellow, Reddish brown.

Density:

7.39

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.

Hardness:

2.5 - Finger Nail

Luster:

Adamantine

Streak:

light yellow

Optical Properties of Schwartzembergite

Gladstone-Dale:

CI meas= -0.106 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.089 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.176,KPDmeas= 0.1786,KC= 0.1616
Ncalc = 2.19 - 2.21

Optical Data:

Biaxial (-), a=2.25, b=2.35, g=2.36, bire=0.1100, 2V(Calc)=32, 2V(Meas)=small. Dispersion very weak.

Calculated Properties of Schwartzembergite

Electron Density:

Bulk Density (Electron Density)=6.21 gm/cc
note: Specific Gravity of Schwartzembergite =7.50 gm/cc.

Fermion Index:

Fermion Index = 0.15
Boson Index = 0.85

Photoelectric:

PE_{Schwartzembergite}=1,351.49 barns/electron
U=PE_{Schwartzembergite} x rElectron Density=8,391.79 barns/cc.

Radioactivity:

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

Schwartzembergite Classification

Dana Class:

22.01.03.01 (22)Iodates - Hydroxyl or Halogen

(22.01)with miscellaneous formulae

(22.01.03)Dana Group

22.01.03.01 Schwartzembergite Pb6(IO3)2O3Cl4 I 4/mmm 4/m 2/m 2/m

Strunz Class:

04.KB.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.K - Iodates

04.KB -Iodates with additional anions, without H2O

04.KB.10 Schwartzembergite Pb6(IO3)2O3Cl4 I 4/mmm 4/m 2/m 2/m

Other Schwartzembergite Information

References:

NAME( Ford32) PHYS. PROP.(AmMin, Vol 87, p 358) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Schwartzembergite :
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

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

Schwartzembergite

Pb++6(IO3)2O3Cl4
Dana No: 22.01.03.01 Strunz No: 04.KB.10
Locality:

Notes: