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Nyholmite

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Formula:
Cd
 
3
Zn
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 4H
 
2
O
System:MonoclinicColour:Colourless, white
Hardness:3 - 3½
Name:Named for Sir Ronald Sydney Nyholm (1917-1971), born at Broken Hill, New South Wales, and chair and professor of Chemistry at University College, London from 1955 to 1971. The name recognises his numerous contributions to inorganic chemistry, in particular the coordination chemistry of the transition metals, and also recognises his Broken Hill roots.


Hureaulite group.

Classification of Nyholmite

IMA status:Approved 2008
Nickel-Strunz 10th (pending) edition ID:8.CB.10

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:39.2.1.6

39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
2 : (AB)5[HXO4]2[XO4]2.xH2O
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Type Occurrence of Nyholmite

Type Locality:Block 14 Opencut, Broken Hill, Yancowinna Co., New South Wales, Australia
General Appearance of Type Material:White globules, tufted aggregates of fibrous crystals and radiating hemispheres of thin, colourless, bladed crystals.
Geological Setting of type material:Supergene mineral.
Associated Minerals at type locality:
Scorodite-Strengite Series Lavendulan-Sampleite SeriesGypsumGoldquarryite

Physical Properties of Nyholmite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent, Translucent
Colour:Colourless, white
Hardness (Mohs):3 - 3½
Hardness Data:Measured
Tenacity:Brittle
Density (calculated):4.23 g/cm3
Comment:for empirical formula

Crystallography of Nyholmite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/b {B1 1 2/b} {C2/c} {C1 2/c 1}
Space Group Setting:C2/c
Cell Parameters:a = 18.062(4) Å, b = 9.341(19) Å, c = 9.844(2) Å
β = 96.17(3)°
Ratio:a:b:c = 1.934 : 1 : 1.054
Unit Cell Volume:V 1,651.23 ų (Calculated from Unit Cell)
Morphology:White globules, tufted aggregates of fibrous crystals and radiating hemispheres of thin, colourless, bladed crystals.
Comment:Crystal data from measurement at 123 K.
X-Ray Powder Diffraction:
d-spacingIntensity
8.985 (35)
8.283 (100)
6.481 (18)
6.169 (29)
4.878 (29)
4.656 (18)
4.491 (12)
4.296 (12)

Chemical Properties of Nyholmite

Formula:
Cd
 
3
Zn
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 4H
 
2
O
Essential elements:As, Cd, H, O, Zn
All elements listed in formula:As, Cd, H, O, Zn

Relationship of Nyholmite to other Species

Structurally related to group(s):
Hureaulite Group
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.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
8.CB.60Burgessite
Co
 
2
(HAsO
 
4
)
 
2
 · 5H
 
2
O

Other Names for Nyholmite

Synonyms:
IMA2008-047
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 Nyholmite

Reference List:

- +
Elliott, P., Turner, P., Jensen, P., Kolitsch, U., Pring, A. (2009): Description and crystal structure of nyholmite, a new mineral related to hureaulite, from Broken Hill, New South Wales, Australia. Mineralogical Magazine, 73, 723-735.

Internet Links for Nyholmite

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    • Localities for Nyholmite

    Hide Locality List
    (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.
    Australia
     
    • New South Wales
      • Yancowinna Co.
        • Broken Hill
    		Elliott, P., Turner, P., Jensen, P., Kolitsch, U., Pring, A. (2009): Description and crystal structure of nyholmite, a new mineral related to hureaulite, from Broken Hill, New South Wales, Australia. Mineralogical Magazine, 73, 723-735.
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