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Burgessite

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Formula:
Co
 
2
(HAsO
 
4
)
 
2
· 5H
 
2
O
System:MonoclinicColour:purplish pink with a ...
Hardness:
Name:After Mr. David Burgess (b.1951)of Newington, Connecticut, USA, a prolific mineral species collector and aspiring museum owner/curator.


This is an extremely rare mineral that strongly resembles erythrite. There was only a single 4 cm x 5 cm specimen found in the Joseph Cilen collection (Hawthorne, New Jersey, USA). That specimen is now in at least 5 pieces, of which one is on file as the type specimen. Examination of "erythrite" specimens from the type locality may locate additional specimens.

Classification of Burgessite

IMA status:Approved 2007
Nickel-Strunz 10th (pending) edition ID:8.CB.60

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
B : With only medium-sized cations, RO4:H2O = 1:1
Dana 8th edition ID:39.1.13.

39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
1 : A[HXO4]·xH2O
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Type Occurrence of Burgessite

Type Locality:Keeley-Frontier Mine (Canadian Keeley; Frontier Mine; Keeley Mine), South Lorrain Township, Cobalt-Gowganda region, Timiskaming District, Ontario, Canada
Place of Conservation of Type Material:Canadian Museum of Nature, catalog no. CMNMC 86051.

Physical Properties of Burgessite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:purplish pink with a slight brown tint
Streak:colorlwss to pale pink
Hardness (Mohs):
Cleavage:Distinct/Good
{010} good and {001} fair
Fracture:None observed
Density (measured):2.93(2) g/cm3
Density (calculated):2.94 g/cm3

Crystallography of Burgessite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/m
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 Volume:V 550.6 ų
Z:2
X-Ray Powder Diffraction:
d-spacingIntensity
7.446 (100)
6.267 (44)
3.725 (29)
3.260 (25)
3.089 (20)
2.998 (31)
2.970 (21)
2.596 (23)

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°
Maximum Birefringence:δ = 0.032

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate

Chemical Properties of Burgessite

Formula:
Co
 
2
(HAsO
 
4
)
 
2
· 5H
 
2
O
Simplified for copy/paste:Co2(HAsO4)2·5H2O
Essential elements:As, Co, H, O
All elements listed in formula:As, Co, H, O

Relationship of Burgessite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.CB.05Serrabrancaite
MnPO
 
4
· H
 
2
O
8.CB.10Hureaulite
(Mn,Fe)
 
5
(PO
 
4
)
 
2
(HPO
 
4
)
 
2
· 4H
 
2
O
8.CB.10Sainfeldite
CaCa
 
2
Ca
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 4H
 
2
O
8.CB.10Villyaellenite
MnMn
 
2
Ca
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 4H
 
2
O
8.CB.10UM1997-09-AsO:CaHMgZn
(Mg,Ca,Zn)
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 4H
 
2
O
8.CB.10Nyholmite
Cd
 
3
Zn
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 4H
 
2
O
8.CB.10Miguelromeroite
MnMn
 
2
Mn
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 4H
 
2
O
8.CB.15Fluckite
CaMn
2+
 
(HAsO
 
4
)
 
2
· 2H
 
2
O
8.CB.15Krautite
Mn(HAsO
 
4
) · H
 
2
O
8.CB.20Cobaltkoritnigite
(Co,Zn)(HAsO
 
4
) · H
 
2
O
8.CB.20Koritnigite
Zn(HAsO
 
4
) · H
 
2
O
8.CB.25Yvonite
Cu(HAsO
 
4
) · 2H
 
2
O
8.CB.30Geminite
Cu(HAsO
 
4
) · H
 
2
O
8.CB.35Schubnelite
Fe
3+
 
VO
 
4
· H
 
2
O
8.CB.40Radovanite
Cu
 
2
Fe
3+
 
(AsO
 
4
)(HAs
3+
 
O
 
3
)
 
2
· H
 
2
O
8.CB.45Kazakhstanite
Fe
3+
5
V
4+
3
V
5+
12
O
 
39
(OH)
 
9
· 9H
 
2
O
8.CB.50Kolovratite
Ni
 
x
Zn
 
y
(VO
 
4
)
 
0.67(x+y)
· nH
 
2
O
8.CB.55Irhtemite
Ca
 
4
Mg(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 4H
 
2
O

Other Names for Burgessite

Synonyms:
IMA2007-055
Other Languages:

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Burgessite

Reference List:

- +
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 Burgessite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • Localities for Burgessite

    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Canada
     
    • Ontario
      • Timiskaming District
        • Cobalt-Gowganda region
          • South Lorrain Township
    Can.Min. 47, 159-164, 165-172(2009)
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