Burckhardtite Mineral Data

General Burckhardtite Information

Chemical Formula:

Pb2(Fe+++,Mn+++)Te++++(AlSi3O10)O2(OH)2•(H2O)

Composition:

Molecular Weight = 934.87 gm

Manganese 1.47 % Mn 2.11 % Mn₂O₃

Aluminum 2.89 % Al 5.45 % Al₂O₃

Iron 4.48 % Fe 6.41 % Fe₂O₃

Silicon 9.01 % Si 19.28 % SiO₂

Tellurium 13.65 % Te 17.07 % TeO₂

Hydrogen 0.22 % H 1.93 % H₂O

Lead 44.33 % Pb 47.75 % PbO

Oxygen 23.96 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₂Fe³⁺_0.75Mn³⁺_0.25TeAlSi₃O₁₂(OH)₂

Environment:

Secondary mineral intergrown with dickite.

IMA Status:

Approved IMA 1979

Locality:

Moctezuma mine, Moctezuma, Sonora, Mexico. Link to MinDat.org Location Data.

Name Origin:

Named for Carlos Burckhardt (1869-19350, Swiss geologist working in Mexico.

Name Pronunciation:

Burckhardtite + Pronunciation

Burckhardtite Image

Images:

Burckhardtite Moctezumite

Comments: Pink crusts of burckhardtite with yellow crystalline moctezumite on quartz.
Location: Moctezuma Mine, Moctezuma, Sonora, Mexico. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Burckhardtite Crystallography

Axial Ratios:

a:b:c =0.5763:1:1.4214

Cell Dimensions:

a = 5.21, b = 9.04, c = 12.85, Z = 2; beta = 90° V = 605.21 Den(Calc)= 5.13

Crystal System:

Monoclinic Space Group: Cm or C 2/m (pseudo-HEX)

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

By Intensity(I/I_o): 3.11(1), 3.7(0.9), 2.6(0.7),

Physical Properties of Burckhardtite

Cleavage:

{001} Perfect

Color:

Violet red, Carmine red, Pink.

Density:

4.96

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Hardness:

2 - Gypsum

Luster:

Adamantine - Pearly

Streak:

light red

Optical Properties of Burckhardtite

Gladstone-Dale:

CI meas= 0.071 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.102 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1637,KPDmeas= 0.1694,KC= 0.1823
Ncalc = 1.9 - 1.94

Optical Data:

Biaxial (-), a=1.82, b=1.85, g=1.85, bire=0.0300, 2V(Calc)=0, 2V(Meas)=0-5.

Pleochroism (x):

pale magenta.

Pleochroism (y):

carmine red.

Pleochroism (z):

carmine red.

Calculated Properties of Burckhardtite

Electron Density:

Bulk Density (Electron Density)=4.36 gm/cc
note: Specific Gravity of Burckhardtite =4.96 gm/cc.

Fermion Index:

Fermion Index = 0.11
Boson Index = 0.89

Photoelectric:

PE_{Burckhardtite}= 824.42 barns/electron
U=PE_{Burckhardtite} x rElectron Density=3,593.24 barns/cc.

Radioactivity:

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

Burckhardtite Classification

Dana Class:

78.05.03.01 (78)Unclassified silicates

(78.05)possible phyllosilicates

(78.05.03)Dana Group

78.05.03.01 Burckhardtite Pb2(Fe,Mn)Te(AlSi3O10)O2(OH)2•(H2O) Cm or C 2/m (pseudo-HEX) Mono

Strunz Class:

09.EC.70 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets

09.EC.70 Burckhardtite Pb2(Fe,Mn)Te(AlSi3O10)O2(OH)2•(H2O) Cm or C 2/m (pseudo-HEX) Mono

Other Burckhardtite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Burckhardtite :
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 Burckhardtite Specimen Label here :

Burckhardtite

Pb2(Fe+++,Mn+++)Te++++(AlSi3O10)O2(OH)2•(H2O)
Dana No: 78.05.03.01 Strunz No: 09.EC.70
Locality:

Notes:

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