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Ashoverite

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Milltown Quarry, Milltown, Ashover, Derbyshire, England, UK
© Steve Rust

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Formula:
Zn(OH)
 
2
System:TetragonalColour:Colourless, milky
Name:For the type locality.
This page provides mineralogical data about Ashoverite.

Classification of Ashoverite

IMA status:Approved
Strunz 8th edition ID:4/F.03-70
Nickel-Strunz 10th (pending) edition ID:4.FA.10

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
A : Hydroxides with OH, without H2O; corner-sharing tetrahedra
Dana 8th edition ID:6.2.11.1

6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
2 : X(OH)2
Hey's CIM Ref.:7.5.3

7 : Oxides and Hydroxides
5 : Oxides of Zn, Cd and Hg
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Type Occurrence of Ashoverite

Type Locality:Milltown Quarry, Milltown, Ashover, Derbyshire, England, UK
General Appearance of Type Material:Square plates to about 0.5 mm, markedly thinning toward their edges; commonly in stellate groups of crystals intersecting at angles of 60°-70°
Place of Conservation of Type Material:The Natural History Museum, London, England (No. 1982,5)
Year of Discovery:1988
Geological Setting of type material:Oxidized vein in limestone
Associated Minerals at type locality:
WülfingiteSweetiteFluorite

Physical Properties of Ashoverite

Lustre:Vitreous, Dull
Diaphaneity (Transparency):Translucent
Colour:Colourless, milky
Streak:White
Cleavage:Perfect
on {001}
Density (measured):3.3 g/cm3
Density (calculated):3.44 g/cm3

Crystallography of Ashoverite

Crystal System:Tetragonal
Cell Parameters:a = 6.825Å, c = 33.36Å
Ratio:a:c = 1 : 4.888
Unit Cell Volume:V 1,553.93 ų (Calculated from Unit Cell)
Z:32
X-Ray Powder Diffraction:
d-spacingIntensity
2.902 (100)
1.819 (33)
1.702 (21)
1.470 (19)
3.031 (13)
1.0063 (13)
Comments:Recorded on type material

Optical Data of Ashoverite

Type:Uniaxial (+)
RI values: nω = 1.629 nε = 1.639
Maximum Birefringence:δ = 0.010

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate

Chemical Properties of Ashoverite

Formula:
Zn(OH)
 
2
Essential elements:H, O, Zn
All elements listed in formula:H, O, Zn
Analytical Data:Averages of eight electron microprobe analyses of type material; total water content determined in a CHN analyzer (i.e. by IR spectrophotometry) and recalculated to 2(OH,O), since thought to lose water under the electron beam
ZnO (84.46)
PbO (2.06)
CdO (0.71)
CaO (0.15)
H2O (14.9)

sum 102.28 wt.-%
Empirical Formula:
(Zn
 
1.18
Pb
 
0.01
Cd
 
0.01
)
 
=1.20
[(OH)
 
1.60
O
 
0.40
]
 
=2.00

Relationship of Ashoverite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.FA.05aBehoite
Be(OH)
 
2
4.FA.05bClinobehoite
Be(OH)
 
2
4.FA.10Sweetite
Zn(OH)
 
2
4.FA.10Wülfingite
Zn(OH)
 
2
Related Minerals - Hey's Index Grouping:

- +
7.5.1Zincite
(Zn,Mn
2+
 
,Fe
2+
 
)O
7.5.2Sweetite
Zn(OH)
 
2
7.5.4Wülfingite
Zn(OH)
 
2
7.5.5Gahnite
ZnAl
 
2
O
 
4
7.5.6Hetaerolite
ZnMn
 
2
O
 
4
7.5.7Hydrohetaerolite
ZnMn
 
2
O
 
4
·H
 
2
O
7.5.8Chalcophanite
(Zn,Fe,Mn)Mn
 
3
O
 
7
·3H
 
2
O
7.5.9Woodruffite
Zn(Mn
4+
 
,Mn
3+
 
)
 
5
O
 
10
·3½H
 
2
O
7.5.10Franklinite
Zn
2+
 
Fe
3+
2
O
 
4
7.5.11Monteponite
CdO
7.5.12Montroydite
HgO

Other Names for Ashoverite

Synonyms:
IMA1986-008
Other Languages:
German:Ashoverit
Spanish:Ashoverita

Other Information

Fluorescence in UV light:SW UV: bluish white
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 Ashoverite

Reference List:Mineralogical Magazine (1988): 52: 699.

Clark, A. M., Fejer, E. E., Cressey, G. and Tandy, P. C. (1988): Ashoverite, a new mineral, and other polymorphs of Zn(OH)2 from Milltown, Ashover, Derbyshire. Mineralogical Magazine 52, 699-702. - American Mineralogist (1990) 75, 431 (abstract).

Schnorrer-Köhler, G. (1988): Mineralogische Nozizen IV. Der Aufschluss 39, 153-168 (in German).

Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 28.

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    Localities for Ashoverite

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