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Petewilliamsite

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Johanngeorgenstadt, Johanngeorgenstadt District, Erzgebirge, Saxony, Germany
© Knut Eldjarn

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Formula:
(Ni,Co)
 
30
(As
 
2
O
 
7
)
 
15
System:MonoclinicColour:dark violet-red to dark ...
Name:
Honouring Prof. Peter A. Williams of the University of Western Sydney, Australia, for his contributions to the study of secondary minerals
This page provides mineralogical data about Petewilliamsite.

Classification of Petewilliamsite

IMA status:Approved 2002
Strunz 8th edition ID:7/A.0-
Nickel-Strunz 10th (pending) edition ID:8.FA.25

8 : PHOSPHATES, ARSENATES, VANADATES
F : Polyphosphates, Polyarsenates, [4]-Polyvanadates
A : Polyphosphates, etc., without OH and H2O; dimers of corner-sharing RO4 tetrahedra.
Dana 7th edition ID:39.1.10.1
mindat.org URL:http://www.mindat.org/min-26522.html
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Type Occurrence of Petewilliamsite

Type Locality:Johanngeorgenstadt, Johanngeorgenstadt District, Erzgebirge, Saxony, Germany
General Appearance of Type Material:scattered patches of mm-sized aggregates, consisting of crystals with an average size of 20 µm to 0.3 mm
Geological Setting of type material:in nickeline-veined quartz
Associated Minerals at type locality:
XanthiositeRooseveltiteQuartzPaganoiteNickeline
BunseniteBismuthAerugite

Physical Properties of Petewilliamsite

Lustre:Vitreous
Diaphaneity (Transparency):Translucent
Colour:dark violet-red to dark brownish red
Density (measured):4.904 g/cm3

Crystallography of Petewilliamsite

Crystal System:Monoclinic
Class (H-M):2 - Sphenoidal
Space Group:B2 {B1 1 2} {C2} {C1 2 1}
Cell Parameters:a = 33.256Å, b = 8.482Å, c = 14.191Å
β = 104.145°
Ratio:a:b:c = 3.921 : 1 : 1.673
Unit Cell Volume:V 3881.6 ų
Z:2
X-Ray Powder Diffraction:
d-spacingIntensity
4.235 (30)
3.118 (100)
3.005 (60)
2.567 (50)
1.637 (50)
1.507 (30)

Chemical Properties of Petewilliamsite

Formula:
(Ni,Co)
 
30
(As
 
2
O
 
7
)
 
15
Essential elements:As, Ni, O
All elements listed in formula:As, Co, Ni, O
Analytical Data:by electron microprobe analysis
NiO (19.45)
CoO (18.39)
CuO (3.40)
CaO (0.17)
FeO (0.04)
As2O5 (60.32)
Common Impurities:Ca,Cu,Fe

Relationship of Petewilliamsite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.FA.05Blossite
α-Cu
 
2
(V
 
2
O
 
7
)
8.FA.10Ziesite
β-Cu
 
2
(V
 
2
O
 
7
)
8.FA.15Chervetite
Pb
 
2
(V
 
2
O
 
7
)
8.FA.15UM1999-17:O:PbV
Pb
 
4
(VO
 
4
)
 
2
O
8.FA.20Pyrocoproite
(K,Na)
 
2
Mg(P
 
2
O
 
7
)
8.FA.20Pyrophosphite
K
 
2
Ca(P
 
2
O
 
7
)

Other Names for Petewilliamsite

Synonyms:
IMA2002-059
Other Languages:
German:Petewilliamsit

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 Petewilliamsite

Reference List:

- +
Roberts, A.C., P.C. Burns, R.A. Gault, A.J. Criddle, M.N. Feinglos (2004): Petewilliamsite, (Ni,Co)30(As2O7)15, a new mineral from Johanngeorgenstadt, Saxony, Germany: description and crystal structure. Mineralogical Magazine 68, 231-240.

Internet Links for Petewilliamsite

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    • Localities for Petewilliamsite

    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.
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    (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.
    Germany
     
    • Saxony
      • Erzgebirge
        • Johanngeorgenstadt District
    		A.C. Roberts, P.C. Burns, R.A. Gault, A.J. Criddle, M. N. Feinglos: Miner. Mag. 68(2):231-240 (2004)
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