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Burgessite

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Formula:
Co2(HAsO4)2 · 5H2O
System:
Monoclinic
Colour:
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

Approved 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
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First Recorded Occurrence of Burgessite

Place of Conservation of First Recorded Material:
Canadian Museum of Nature, catalog no. CMNMC 86051.

Physical Properties of Burgessite

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:
2.93(2) g/cm3 (Measured)    2.94 g/cm3 (Calculated)

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 Data:
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°
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

Chemical Properties of Burgessite

Formula:
Co2(HAsO4)2 · 5H2O
Essential elements:
All elements listed in formula:

Relationship of Burgessite to other Species

8.CB.05SerrabrancaiteMnPO4 · H2O
8.CB.10Hureaulite(Mn,Fe)5(PO4)2(HPO4)2 · 4H2O
8.CB.10SainfelditeCaCa2Ca2(AsO4)2(HAsO4)2 · 4H2O
8.CB.10VillyaelleniteMnMn2Ca2(AsO4)2(HAsO4)2 · 4H2O
8.CB.10UM1997-09-AsO:CaHMgZn(Mg,Ca,Zn)5(AsO4)2(HAsO4)2 · 4H2O
8.CB.10NyholmiteCd3Zn2(AsO4)2(HAsO4)2 · 4H2O
8.CB.10MiguelromeroiteMnMn2Mn2(AsO4)2(HAsO4)2 · 4H2O
8.CB.15FluckiteCaMn2+(HAsO4)2 · 2H2O
8.CB.15KrautiteMn(HAsO4) · H2O
8.CB.20Cobaltkoritnigite(Co,Zn)(HAsO4) · H2O
8.CB.20KoritnigiteZn(HAsO4) · H2O
8.CB.25YvoniteCu(HAsO4) · 2H2O
8.CB.30GeminiteCu(HAsO4) · H2O
8.CB.35SchubneliteFe3+VO4 · H2O
8.CB.40RadovaniteCu2Fe3+(AsO4)(HAs3+O3)2 · H2O
8.CB.45KazakhstaniteFe53+V34+V125+O39(OH)9 · 9H2O
8.CB.50KolovratiteNixZny(VO4)0.67(x+y) · nH2O
8.CB.55IrhtemiteCa4Mg(AsO4)2(HAsO4)2 · 4H2O

Other Names for Burgessite

Name in Other Languages:

Other Information

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 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

Localities for Burgessite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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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