Burgessite
A valid IMA mineral species
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About Burgessite
David Burgess
Formula:
Co2(H2O)4[AsO3(OH)]2(H2O)
Colour:
Purplish pink with a slight brown tint
Lustre:
Vitreous, Sub-Vitreous
Hardness:
3½
Specific Gravity:
2.93
Crystal System:
Monoclinic
Name:
Named in 2009 by Jiří Sejkora, Frank C. Hawthorne, Mark A. Cooper, Joel D. Grice, Josef Vajdak, and John L. Jambor in honor of the discoverer, David Burgess [April 18, 1951 USA - August 28, 2016 Newington, Connecticut, USA], a prolific mineral species collector and aspiring museum owner/curator.
Type Locality:
Isostructural with:
This is an extremely rare cobalt hydrogen arsenate mineral that strongly resembles erythrite. Erythrite has a steep termination characteristic of the vivianite group. Initial observations of burgessite suggest that it has a termination with a noticeably less acute slope and the crystal cross-sections look more like rods than blades. Originally, only a single 4 x 5 cm matrix specimen with a coating of what proved to be the new species, burgessite, was found in the Joseph Cilen collection (Hawthorne, New Jersey, USA), but subsequently 5 pieces were discovered during the investigation to name the species.
Unique Identifiers
Mindat ID:
35833
Long-form identifier:
mindat:1:1:35833:8
Similar Names
| Bourgeoisite | A synonym of Pseudowollastonite |
| Burgasite | A rock subtype |
IMA Classification of Burgessite
Approved
IMA Formula:
Co2+2(H2O)4(As5+O3OH)2·H2O
Approval year:
2007
First published:
2009
Type description reference:
Classification of Burgessite
8.CB.60
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
B : With only medium-sized cations, RO4:H2O = 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
B : With only medium-sized cations, RO4:H2O = 1:1
39.1.13.
39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
1 : A[HXO4]·xH2O
39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
1 : A[HXO4]·xH2O
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Bge | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Burgessite
Vitreous, Sub-Vitreous
Transparency:
Transparent
Colour:
Purplish pink with a slight brown tint
Streak:
Colorless to pale pink
Hardness:
3½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
{010} good and {001} fair
{010} good and {001} fair
Fracture:
Hackly
Density:
2.93(2) g/cm3 (Measured) 2.94 g/cm3 (Calculated)
Optical Data of Burgessite
Type:
Biaxial (+)
RI values:
nα = 1.596(2) nβ = 1.604(2) nγ = 1.628(2)
2V:
Measured: 70° (2), Calculated: 61°
Birefringence:
0.032
Max. Birefringence:
δ = 0.032
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Optical Extinction:
X = b, Y ∧ c = 29° (in β obtuse)
Pleochroism:
Non-pleochroic
Chemistry of Burgessite
Mindat Formula:
Co2(H2O)4[AsO3(OH)]2(H2O)
Element Weights:
Elements listed:
Crystallography of Burgessite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 4.7058(12) Å, b = 9.299(3) Å, c = 12.738(4) Å
β = 98.933(8)°
β = 98.933(8)°
Ratio:
a:b:c = 0.506 : 1 : 1.37
Unit Cell V:
550.6 ų
Z:
2
Morphology:
Rod-like crystals with sloping termination shallower than erythrite.
Twinning:
None observed
Comment:
P21/n
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0006277 | Burgessite | Cooper M A, Hawthorne F C (2009) The crystal structure of burgessite, Co2(H2O)4[AsO3(OH)]2(H2O), and its relation to erythrite The Canadian Mineralogist 47 165-172 |  | 2009 | Keeley mine, South Lorrain Township, Timiskaming District, Ontario, Canada | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.446 Å | (100) |
| 6.267 Å | (44) |
| 5.189 Å | (9) |
| 4.588 Å | (7) |
| 4.343 Å | (9) |
| 4.146 Å | (12) |
| 4.117 Å | (5) |
| 3.809 Å | (8) |
| 3.725 Å | (29) |
| 3.379 Å | (11) |
| 3.260 Å | (25) |
| 3.173 Å | (15) |
| 3.132 Å | (1) |
| 3.089 Å | (20) |
| 3.045 Å | (12) |
| 2.998 Å | (31) |
| 2.970 Å | (21) |
| 2.893 Å | (9) |
| 2.781 Å | (1) |
| 2.775 Å | (2) |
| 2.761 Å | (17) |
| 2.729 Å | (13) |
| 2.596 Å | (23) |
| 2.571 Å | (19) |
| 2.4838 Å | (15) |
| 2.4752 Å | (11) |
| 2.4544 Å | (6) |
| 2.3672 Å | (9) |
| 2.3476 Å | (1) |
| 2.3206 Å | (3) |
| 2.3100 Å | (2) |
| 2.2973 Å | (4) |
| 2.2940 Å | (1) |
| 2.2788 Å | (1) |
| 2.2322 Å | (1) |
| 2.2060 Å | (4) |
| 2.2019 Å | (2) |
| 2.1687 Å | (1) |
| 2.1599 Å | (2) |
| 2.1519 Å | (5) |
| 2.1115 Å | (3) |
| 2.1094 Å | (4) |
| 2.0943 Å | (2) |
| 2.0775 Å | (1) |
| 2.0763 Å | (1) |
| 2.0740 Å | (2) |
| 2.0719 Å | (8) |
| 2.0674 Å | (2) |
| 2.0402 Å | (7) |
| 2.0257 Å | (17) |
| 2.0219 Å | (4) |
| 2.0041 Å | (1) |
| 1.9817 Å | (2) |
| 1.9734 Å | (3) |
| 1.9476 Å | (13) |
| 1.9275 Å | (3) |
| 1.9061 Å | (5) |
| 1.8918 Å | (6) |
| 1.8768 Å | (2) |
| 1.8520 Å | (5) |
| 1.8408 Å | (2) |
| 1.8332 Å | (15) |
| 1.8172 Å | (3) |
| 1.8079 Å | (1) |
Reference:
Comments:
Minor similarities to erythrite. Data from: Sejkora, J., F.C. Hawthorne, M.A. Cooper, J.D. Grice, J. Vajdak and J.L. Jambor (2009), Burgessite, a new arsenate mineral species from the Keeley Mine, South Lorrain Township, Ontario, Canada, Canadian Mineralogist 47, 159-164(2009)
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Burgessite
General Appearance of Type Material:
Rosettes up to 0.8 mm across consisting of prismatic crystals up to 0.1 mm long.
Place of Conservation of Type Material:
Canadian Museum of Nature, Ottawa, Ontario, Canada, catalog no. CMNMC 86051.
Geological Setting of Type Material:
Late-stage alteration of cobalt-bearing ore.
Associated Minerals at Type Locality:
Reference:
Synonyms of Burgessite
Other Language Names for Burgessite
Dutch:Burgessiet
German:Burgessit
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 8.CB. | Krupičkaite | Cu6[AsO3(OH)]6 · 8H2O |
| 8.CB.X | Honzaite | Ni2(AsO3OH)2 · 5H2O |
| 8.CB.X | Redondite | AlPO4 · 2H2O |
| 8.CB.05 | Ermeloite | Al(PO4) · H2O |
| 8.CB.05 | Serrabrancaite | MnPO4 · H2O |
| 8.CB.10 | Nyholmite | Cd3Zn2(AsO3OH)2(AsO4)2 · 4H2O |
| 8.CB.10 | Villyaellenite | (Mn,Ca)Mn2Ca2(AsO3OH)2(AsO4)2 · 4H2O |
| 8.CB.10 | Giftgrubeite | CaMn2Ca2(AsO4)2(AsO3OH)2 · 4H2O |
| 8.CB.10 | Hureaulite | Mn2+5(PO3OH)2(PO4)2 · 4H2O |
| 8.CB.10 | Miguelromeroite | Mn2+5(AsO3OH)2(AsO4)2(H2O)4 |
| 8.CB.10 | 'UM1997-09-AsO:CaHMgZn' | (Mg,Ca,Zn)5(AsO4)2(HAsO4)2 · 4H2O |
| 8.CB.15 | Krautite | Mn(HAsO4) · H2O |
| 8.CB.20 | Cobaltkoritnigite | Co(AsO3OH) · H2O |
| 8.CB.20 | Magnesiokoritnigite | Mg(AsO3OH) · H2O |
| 8.CB.20 | Koritnigite | Zn(AsO3OH) · H2O |
| 8.CB.25 | Yvonite | Cu(HAsO4) · 2H2O |
| 8.CB.30 | Geminite | Cu2+(AsO3OH) · H2O |
| 8.CB.35 | Schubnelite | Fe3+VO4 · H2O |
| 8.CB.40 | Radovanite | Cu2Fe3+(AsO4)(HAs3+O3)2 · H2O |
| 8.CB.45 | Kazakhstanite | Fe3+5V4+3V5+12O39(OH)9 · 9H2O |
| 8.CB.50 | Kolovratite | NixZny(VO4)0.67(x+y) · nH2O |
| 8.CB.65 | Cardite | Zn5.5(AsO4)2(AsO3OH)(OH)3 · 3H2O |
Fluorescence of Burgessite
Not fluorescent in ultraviolet light
Other Information
IR Spectrum:
Sejkora, J., F.C. Hawthorne, M.A. Cooper, J.D. Grice, J. Vajdak and J.L. Jambor (2009), Burgessite, a new arsenate mineral species from the Keeley Mine, South Lorrain Township, Ontario, Canada, Canadian Mineralogist 47, 159-164(2009)
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Burgessite
mindat.org URL:
https://www.mindat.org/min-35833.html
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References for Burgessite
Reference List:
Sejkora, J., Hawthorne, F. C., Cooper, M. A., Grice, J. D., Vajdak, J., Jambor, J. L. (2009) Burgessite, Co2(H2O)4[AsO3(OH)]2(H2O), a new arsenate mineral species from the Keeley Mine, South Lorrain Township, Ontario, Canada. The Canadian Mineralogist, 47 (1) 159-164 doi:10.3749/canmin.47.1.159
Cooper, M. A., Hawthorne, F. C. (2009) The crystal structure of burgessite, Co2(H2O)4[AsO3(OH)]2(H2O), and its relation to erythrite. The Canadian Mineralogist, 47 (1) 165-172 doi:10.3749/canmin.47.1.165
Localities for Burgessite
Showing 2 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Canada (TL) | |
| Sejkora et al. (2009) +1 other reference |
Czech Republic | |
| Bulletin Mineralogicko-Petrologickeho Oddeleni Narodniho Muzea v Praze 22 (2014) |
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Keeley-Frontier Mine, South Lorrain Township, Cobalt-Gowganda region, Timiskaming District, Ontario, Canada