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Burgessite

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Canadian Keeley Mine (Frontier Mine), South Lorrain Township, Cobalt-Gowganda region, Timiskaming District, Ontario, Canada
© 2008, JGW

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Formula:
Co
 
2
 (H
 
2
O)
 
4
[AsO
 
3
OH]
 
2
(H
 
2
O)}
System:MonoclinicColour:purplish pink with a ...
Hardness:3½
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:Canadian Keeley Mine (Frontier 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):3½
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 {P1 1 21/m} {P21/m} {P1 21/m 1}
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)

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
 (H
 
2
O)
 
4
[AsO
 
3
OH]
 
2
(H
 
2
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
 
3
OH)
 
2
(PO
 
4
)
 
2
·4H
 
2
O
8.CB.10Sainfeldite
Ca
 
5
(AsO
 
3
OH)
 
2
(AsO
 
4
)
 
2
·4H
 
2
O
8.CB.10Villyaellenite
(Mn,Ca,Zn)
 
5
(AsO
 
3
OH)
 
2
(AsO
 
4
)
 
2
·4H
 
2
O
8.CB.10UM1997-09-AsO:CaHMgZn
(Mg,Ca,Zn)
 
5
(AsO
 
4
)
 
2
[AsO
 
3
(OH)]
 
2
·4H
 
2
O
8.CB.10IMA2008-047
Cd
 
3
Zn
 
2
(AsO
 
3
OH)
 
2
(AsO
 
4
)
 
2
·4H
 
2
O
8.CB.10Miguelromeroite
Mn
 
5
(AsO
 
3
OH)
 
2
(AsO
 
4
)
 
2
·4H
 
2
O
8.CB.15Fluckite
CaMnH
 
2
(AsO
 
4
)
 
2
·2H
 
2
O
8.CB.15Krautite
MnHAsO
 
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
 
2
[As
 
2
O
 
7
] · 3H
 
2
O
8.CB.35Schubnelite
Fe
 
2-x
V
 
2
O
 
4
(OH)
 
4
8.CB.40Radovanite
Cu
 
2
Fe
3+
 
[(As
3+
 
O
 
2
(OH)]
 
2
[As
5+
 
O
 
4
]·H
 
2
O
8.CB.45Kazakhstanite
Fe
 
5
V
 
3
V
 
12
O
 
39
(OH)
 
9
·9H
 
2
O
8.CB.50Kolovratite
(Zn,Ni,Cu)
 
2-5
Al
 
4-6
(Si,V
4+
 
,V
5+
 
)
 
4
(O,OH)
 
20
·7.5H
 
2
O
8.CB.55Irhtemite
Ca
 
4
Mg[(HAsO
 
4
)
 
2
|(AsO
 
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

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    Localities for Burgessite

    Hide Locality List
    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)
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 23rd Oct 2009 12:17:16