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Burgessite Mineral Data

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General Burgessite Information

Help on Chemical  Formula: Chemical Formula: Co2(H2O)4[(AsO3OH)]2•(H2O)
Help on Composition: Composition: Molecular Weight = 487.36 gm
   Calcium    0.16 %  Ca    0.23 % CaO
   Cobalt    21.16 %  Co   26.91 % CoO
   Nickel     2.77 %  Ni    3.52 % NiO
   Arsenic   30.75 %  As   47.16 % As2O5
   Hydrogen   2.48 %  H    22.18 % H2O
   Oxygen    42.68 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Co1.75Ni0.23Ca0.02(AsO3OH)2•5(H2O)
Help on Environment: Environment: Purchased as mineral specimen labeled "erythrite" from a mineral dealer; the sample consists of pink rosettes on matrix and was collected in the 1920s. .New structure type.
Help on IMA Status: IMA Status: Approved IMA 2007 (Dana # Added)
Help on Locality: Locality: Keeley mine, South Lorrain Township, Timiskaming District, Ontario, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for David S. Burgess (born April 18, 1951) of Newington, Connecticut, U.S.A.
Help on Synonym: Synonym: IMA2007-055

Burgessite Image

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Comments: Rosettes of burgessite showing the individual lath-like crystals and their adamantine luster. (CanMin, v47:159).
Location: Keeley mine, South Lorrain Township, Timiskaming District, Ontario, Canada.. Scale: Picture size 1.1 mm.
© Canadian Mineralogist

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Comments: SEM photographs of a rosette of burgessite. (CanMin, v47:159).
Location: Keeley mine, South Lorrain Township, Timiskaming District, Ontario, Canada.. Scale: Picture size50 µm.
© Canadian Mineralogist

Burgessite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.506:1:1.3698
Help on Cell Dimensions: Cell Dimensions: a = 4.7058, b = 9.299, c = 12.738, Z = 2; beta = 98.933° V = 550.64 Den(Calc)= 2.94
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.446(1), 6.267(0.44), 2.998(0.31),3.725(0.29), 3.26(0.25), 2.596(0.23), 2.97(0.21), 3.089(0.2),

Physical Properties of Burgessite

Help on Cleavage: Cleavage: {010} Good, {001} Fair
Help on Color: Color: Purplish pink.
Help on Density: Density: 2.93
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Irregular - Very brittle fracture producing irregular fragments
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Rosette - Bundled tabular aggregates resembling rose flower petals.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Adamantine
Help on Streak: Streak: pale pink

Optical Properties of Burgessite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2073,KPDmeas= 0.208,KC= 0.2067
Ncalc = 1.61
Help on Optical Data: Optical Data: Biaxial (+), a=1.596, b=1.604, g=1.628, bire=0.0320

Calculated Properties of Burgessite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.85 gm/cc
note: Specific Gravity of Burgessite =2.94 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0005237727
Boson Index = 0.9994762273
Help on Photoelectric: Photoelectric: PEBurgessite = 28.90 barns/electron
U=PEBurgessite x rElectron Density= 82.33 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Burgessite is Not Radioactive

Burgessite Classification

Help on  Dana Class: Dana Class: (39)Hydrated Acid Phosphates, etc
  (39.01)A+ [HXO4] � x(H2O)
  (39.01.11)Dana Group Burgessite! Co2(H2O)4[(AsO3OH)]2•(H2O) P 21/n 2/m
Help on  Strunz Class: Strunz Class: 08.CB.60 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CB -With only medium-sized cations, RO4:H2O = 1:1
08.CB.60 Burgessite! Co2(H2O)4[(AsO3OH)]2•(H2O) P 21/n 2/m

Other Burgessite Information

Help on References: References: NAME( CanMin, v47:159) PHYS. PROP.(CanMin, v47:159) OPTIC PROP.(CanMin, v47:159)
Help on See Also: See Also: Links to other databases for Burgessite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 08.CB.60





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