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Burgessite

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David Burgess
Formula:
Co2(HAsO4)2 · 5H2O
Colour:
purplish pink with a slight brown tint
Lustre:
Vitreous, Sub-Vitreous
Hardness:
Specific Gravity:
2.93
Crystal System:
Monoclinic
Name:
Named in 2009 by Jiří Sejkora, Frank C. Hawthorne, Mark A. Cooper, Joel D. Grice, Josef Vejdak, and 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.
Isostructural with:
This is an extremely rare 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 cm 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.


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Classification of BurgessiteHide

Approved
Approval Year:
2007
8.CB.60

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

Physical Properties of BurgessiteHide

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
Fracture:
Hackly
Density:
2.93(2) g/cm3 (Measured)    2.94 g/cm3 (Calculated)

Optical Data of BurgessiteHide

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.
Surface Relief:
Moderate
Optical Extinction:
X=b, Y^c = 29°
Pleochroism:
Non-pleochroic

Chemical Properties of BurgessiteHide

Formula:
Co2(HAsO4)2 · 5H2O
IMA Formula:
Co2(H2O)4(AsO3OH)2 · H2O

Crystallography of BurgessiteHide

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)°
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.
Comment:
P21/n

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.446 (100)
6.267 (44)
5.189 (9)
4.588 (7)
4.343 (9)
4.146 (12)
4.117 (5)
3.809 (8)
3.725 (29)
3.379 (11)
3.260 (25)
3.173 (15)
3.132 (1)
3.089 (20)
3.045 (12)
2.998 (31)
2.970 (21)
2.893 (9)
2.781 (1)
2.775 (2)
2.761 (17)
2.729 (13)
2.596 (23)
2.571 (19)
2.4838 (15)
2.4752 (11)
2.4544 (6)
2.3672 (9)
2.3476 (1)
2.3206 (3)
2.3100 (2)
2.2973 (4)
2.2940 (1)
2.2788 (1)
2.2322 (1)
2.2060 (4)
2.2019 (2)
2.1687 (1)
2.1599 (2)
2.1519 (5)
2.1115 (3)
2.1094 (4)
2.0943 (2)
2.0775 (1)
2.0763 (1)
2.0740 (2)
2.0719 (8)
2.0674 (2)
2.0402 (7)
2.0257 (17)
2.0219 (4)
2.0041 (1)
1.9817 (2)
1.9734 (3)
1.9476 (13)
1.9275 (3)
1.9061 (5)
1.8918 (6)
1.8768 (2)
1.8520 (5)
1.8408 (2)
1.8332 (15)
1.8172 (3)
1.8079 (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)

Occurrences of BurgessiteHide

Type Occurrence of BurgessiteHide

Place of Conservation of Type Material:
Canadian Museum of Nature, catalog no. CMNMC 86051.
Geological Setting of Type Material:
Late-stage alteration of cobalt-bearing ore
Associated Minerals at Type Locality:

Synonyms of BurgessiteHide

Other Language Names for BurgessiteHide

Related Minerals - Nickel-Strunz GroupingHide

8.CB.05SerrabrancaiteMnPO4 · H2OMon. 2/m : B2/b
8.CB.10Hureaulite(Mn,Fe)5(PO4)2(HPO4)2 · 4H2OMon. 2/m : B2/b
8.CB.10SainfelditeCaCa2Ca2(AsO4)2(HAsO4)2 · 4H2OMon. 2/m : B2/b
8.CB.10VillyaelleniteMnMn2Ca2(AsO4)2(HAsO4)2 · 4H2OMon. 2/m : B2/b
8.CB.10UM1997-09-AsO:CaHMgZn(Mg,Ca,Zn)5(AsO4)2(HAsO4)2 · 4H2OMon.
8.CB.10NyholmiteCd3Zn2(AsO4)2(HAsO4)2 · 4H2OMon. 2/m : B2/b
8.CB.10MiguelromeroiteMnMn2Mn2(AsO4)2(HAsO4)2 · 4H2OMon. 2/m : B2/b
8.CB.15FluckiteCaMn2+(HAsO4)2 · 2H2OTric. 1 : P1
8.CB.15KrautiteMn(HAsO4) · H2OMon. 2 : P21
8.CB.20Cobaltkoritnigite(Co,Zn)(HAsO4) · H2OTric. 1 : P1
8.CB.20KoritnigiteZn(HAsO4) · H2OTric. 1 : P1
8.CB.25YvoniteCu(HAsO4) · 2H2OTric.
8.CB.30GeminiteCu(HAsO4) · H2OTric.
8.CB.35SchubneliteFe3+VO4 · H2OTric.
8.CB.40RadovaniteCu2Fe3+(AsO4)(HAs3+O3)2 · H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.CB.45KazakhstaniteFe3+5V4+3V5+12O39(OH)9 · 9H2OMon.
8.CB.50KolovratiteNixZny(VO4)0.67(x+y) · nH2O
8.CB.55IrhtemiteCa4Mg(AsO4)2(HAsO4)2 · 4H2OMon.

Fluorescence of BurgessiteHide

Not fluorescent in ultraviolet light

Other InformationHide

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.

References for BurgessiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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)
Cooper, M.A. & F.C. Hawthorne: The crystal structure of burgessite, and its relation to erythrite. Canadian Mineralogist, 47, 165-172(2009)

Internet Links for BurgessiteHide

Localities for BurgessiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada (TL)
 
  • Ontario
    • Timiskaming District
      • Cobalt-Gowganda region
        • South Lorrain Township
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) Cooper, M.A. & F.C. Hawthorne (2009): The crystal structure of burgessite, and its relation to erythrite. Canadian Mineralogist, 47, 165-172
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Karlovy Vary Region
      • Krušné Hory Mts (Erzgebirge)
        • Jáchymov District (St Joachimsthal)
Bulletin Mineralogicko-Petrologickeho Oddeleni Narodniho Muzea v Praze 22 (2014) 221.
Mineral and/or Locality  
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