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Burckhardtite Mineral Data

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General Burckhardtite Information

Help on Chemical  Formula: Chemical Formula: Pb2(Fe+++,Mn+++)Te++++(AlSi3O10)O2(OH)2•(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Pb2Fe3+0.75Mn3+0.25TeAlSi3O12(OH)2
Help on Environment: Environment: Secondary mineral intergrown with dickite.
Help on IMA Status: IMA Status: Approved IMA 1979
Help on Locality: Locality: Moctezuma mine, Moctezuma, Sonora, Mexico. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Carlos Burckhardt (1869-19350, Swiss geologist working in Mexico.
Help on Name Pronunciation: Name Pronunciation: Burckhardtite + Pronunciation Say BURCKHARDTITE

Burckhardtite Image

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  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

Help on Axial Ratios: Axial Ratios: a:b:c =0.5763:1:1.4214
Help on Cell Dimensions: Cell Dimensions: a = 5.21, b = 9.04, c = 12.85, Z = 2; beta = 90° V = 605.21 Den(Calc)= 5.13
Help on Crystal System: Crystal System: Monoclinic Space Group: Cm or C 2/m (pseudo-HEX)
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.11(1), 3.7(0.9), 2.6(0.7),

Physical Properties of Burckhardtite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Violet red, Carmine red, Pink.
Help on Density: Density: 4.96
Help on Habit: Habit: Pseudo Hexagonal - Crystals show a hexagonal outline.
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Adamantine - Pearly
Help on Streak: Streak: light red

Optical Properties of Burckhardtite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (-), a=1.82, b=1.85, g=1.85, bire=0.0300, 2V(Calc)=0, 2V(Meas)=0-5.
Help on Pleochroism (x): Pleochroism (x): pale magenta.
Help on Pleochroism (y): Pleochroism (y): carmine red.
Help on Pleochroism (z): Pleochroism (z): carmine red.

Calculated Properties of Burckhardtite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.36 gm/cc
note: Specific Gravity of Burckhardtite =4.96 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.11
Boson Index = 0.89
Help on Photoelectric: Photoelectric: PEBurckhardtite = 824.42 barns/electron
U=PEBurckhardtite x rElectron Density=3,593.24 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Burckhardtite is Not Radioactive

Burckhardtite Classification

Help on  Dana Class: Dana Class: (78)Unclassified silicates
  (78.05)possible phyllosilicates
  (78.05.03)Dana Group Burckhardtite Pb2(Fe,Mn)Te(AlSi3O10)O2(OH)2•(H2O) Cm or C 2/m (pseudo-HEX) Mono
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: 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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Dana No: Strunz No: 09.EC.70





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