Burgessite Mineral Data

General Burgessite Information

Chemical Formula:

Co2(H2O)4[(AsO3OH)]2•(H2O)

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

Empirical Formula:

Co_1.75Ni_0.23Ca_0.02(AsO₃OH)₂•5(H₂O)

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.

IMA Status:

Approved IMA 2007 (Dana # Added)

Locality:

Keeley mine, South Lorrain Township, Timiskaming District, Ontario, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for David S. Burgess (born April 18, 1951) of Newington, Connecticut, U.S.A.

Synonym:

IMA2007-055

Burgessite Image

Images:

Burgessite

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

Images:

Burgessite

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

Axial Ratios:

a:b:c =0.506:1:1.3698

Cell Dimensions:

a = 4.7058, b = 9.299, c = 12.738, Z = 2; beta = 98.933° V = 550.64 Den(Calc)= 2.94

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

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

By Intensity(I/I_o): 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

Cleavage:

{010} Good, {001} Fair

Color:

Purplish pink.

Density:

2.93

Diaphaneity:

Transparent

Fracture:

Brittle - Irregular - Very brittle fracture producing irregular fragments

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Rosette - Bundled tabular aggregates resembling rose flower petals.

Hardness:

3 - Calcite

Luster:

Adamantine

Streak:

pale pink

Optical Properties of Burgessite

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

Optical Data:

Biaxial (+), a=1.596, b=1.604, g=1.628, bire=0.0320

Calculated Properties of Burgessite

Electron Density:

Bulk Density (Electron Density)=2.85 gm/cc
note: Specific Gravity of Burgessite =2.94 gm/cc.

Fermion Index:

Fermion Index = 0.0005237727
Boson Index = 0.9994762273

Photoelectric:

PE_Burgessite= 28.90 barns/electron
U=PE_Burgessite x rElectron Density= 82.33 barns/cc.

Radioactivity:

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

Burgessite Classification

Dana Class:

39.01.11.01 (39)Hydrated Acid Phosphates, etc

(39.01)A+ [HXO4] · x(H2O)

(39.01.11)Dana Group

39.01.11.01 Burgessite! Co2(H2O)4[(AsO3OH)]2•(H2O) P 2₁/n 2/m

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

References:

NAME( CanMin, v47:159) PHYS. PROP.(CanMin, v47:159) OPTIC PROP.(CanMin, v47:159)

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

Search for Burgessite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Burgessite :

A Bijoux Google Search for Burgessite
Adam's Minerals Google Search for Burgessite
Cape Minerals Google Search for Burgessite
Dakota Matrix Minerals Google Search for Burgessite
Excalibur Mineral Corp. Google Search for Burgessite
Exceptional Minerals Google Search for Burgessite
John Betts Fine Minerals Search for Burgessite
McDougall Minerals Google Search for Burgessite
Mineral News Website Link
Rock and Mineral Shows Google Search for Burgessite
Weinrich Minerals, Inc. Google Search for Burgessite

Ask about Burgessite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Burgessite

Co2(H2O)4[(AsO3OH)]2•(H2O)
Dana No: 39.01.11.01 Strunz No: 08.CB.60
Locality:

Notes: