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Petewilliamsite

Big Photo

Johanngeorgenstadt, Erzgebirge, Saxony, Germany
© Knut Eldjarn

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, 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
3.118 (100)
3.005 (60)
2.567 (50)
1.637 (50)
4.235 (30)

Chemical Properties of Petewilliamsite

Formula:
(Ni,Co)
 
30
[As
 
2
O
 
7
]
 
15
All elements listed in formula:As, Co, Ni, O
Analyical 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.20Pyrocoproite
Mg(K,Na)
 
2
P
 
2
O
 
7
8.FA.20Pyrophosphite
K
 
2
CaP
 
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(2): 231-240.

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Internet Links for Petewilliamsite

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    Localities for Petewilliamsite

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    Germany
     
    • Saxony
      • Erzgebirge
    		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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