Burgessite
A valid IMA mineral species
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About Burgessite
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
GUID
(UUID V4):
(UUID V4):
964dd239-16ee-4276-968b-6119dd9c8a20
IMA Classification of Burgessite
Approved
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 |
---|---|---|
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
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
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)
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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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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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) |
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:
Sejkora, J., Hawthorne, F.C., Cooper, M.A., Grice, J.D., Vajdak, J., Jambor, J.L. (2009): Burgessite, a new arsenate mineral species from the Keeley Mine, South Lorrain Township, Ontario, Canada. The Canadian Mineralogist, 47, 159-164.
Synonyms of Burgessite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
8.CB. | Krupičkaite | Cu6[AsO3(OH)]6 · 8H2O |
8.CB.05 | Serrabrancaite | MnPO4 · H2O |
8.CB.05 | Ermeloite | Al(PO4) · H2O |
8.CB.10 | Hureaulite | Mn2+5(PO3OH)2(PO4)2 · 4H2O |
8.CB.10 | Villyaellenite | MnMn2Ca2(AsO4)2(HAsO4)2 · 4H2O |
8.CB.10 | UM1997-09-AsO:CaHMgZn | (Mg,Ca,Zn)5(AsO4)2(HAsO4)2 · 4H2O |
8.CB.10 | Nyholmite | Cd3Zn2(AsO4)2(HAsO4)2 · 4H2O |
8.CB.10 | Miguelromeroite | MnMn2Mn2(AsO4)2(HAsO4)2 · 4H2O |
8.CB.10 | Giftgrubeite | CaMn2Ca2(AsO4)2(AsO3OH)2 · 4H2O |
8.CB.15 | Krautite | Mn(HAsO4) · H2O |
8.CB.20 | Cobaltkoritnigite | Co(AsO3OH) · H2O |
8.CB.20 | Koritnigite | Zn(AsO3OH) · H2O |
8.CB.20 | Magnesiokoritnigite | Mg(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.60 | Honzaite | Ni2(AsO3OH)2 · 5H2O |
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
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
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