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Asisite

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Kombat Mine, Kombat, Grootfontein District, Otjozondjupa Region, Namibia
© Thomas Witzke

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Formula:
Pb
 
7
[O
 
4
|SiO
 
4
|Cl
 
2
]
System:TetragonalColour:Yellow to yellow-green
Hardness:3½
Name:Named after the Asis farm where the Kombat mine is located.
This page provides mineralogical data about Asisite.

Classification of Asisite

IMA status:Approved
Strunz 8th edition ID:3/D.10-190
Nickel-Strunz 10th (pending) edition ID:3.DB.40

3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
B : With Pb, Cu, etc.
Dana 8th edition ID:10.2.7.1

10 : OXYHALIDES AND HYDROXYHALIDES
2 : A(O,OH)Xq
Hey's CIM Ref.:17.3.9

17 : Silicates Containing other Anions
3 : Silicates with chloride (including aluminosilicates)
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Type Occurrence of Asisite

Type Locality:Kombat Mine, Kombat, Grootfontein District, Otjozondjupa Region, Namibia
Year of Discovery:1988

Physical Properties of Asisite

Colour:Yellow to yellow-green
Hardness (Mohs):3½

Crystallography of Asisite

Crystal System:Tetragonal
Class (H-M):4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:I4/mmm (I4/m 2/m 2/m)
Cell Parameters:a = 3.897(2) Å, c = 22.81(2) Å
Ratio:a:c = 1 : 5.853
Unit Cell Volume:V 346.41 ų (Calculated from Unit Cell)
Z:1
Morphology:Tabular on {001}.
Comment:Only subcell (but strongly dominant); real cell has tetragonal cell parameters ~14 and ~23 A (Welch, 2004)

Optical Data of Asisite

Type:Uniaxial (-)
RI values: nω = 2.390 nε = 2.320
Maximum Birefringence:δ = 0.070

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

Chemical Properties of Asisite

Formula:
Pb
 
7
[O
 
4
|SiO
 
4
|Cl
 
2
]
Essential elements:Cl, O, Pb, Si
All elements listed in formula:Cl, O, Pb, Si

Relationship of Asisite to other Species

Related Minerals - Nickel-Strunz Grouping):
3.DB.05Diaboleite
Pb
 
2
CuCl
 
2
(OH)
 
4
3.DB.10Pseudoboleite
Pb
 
31
Cu
 
24
Cl
 
62
(OH)
 
48
3.DB.15Boleite
KPb
 
26
Ag
 
9
Cu
 
24
(OH)
 
48
Cl
 
62
3.DB.20Cumengeite
3.DB.20Cumengeite
Pb
 
21
Cu
 
20
Cl
 
42
(OH)
 
40
·6H
 
2
O
3.DB.25Bideauxite
Pb
 
2
Ag[(F,OH)
 
2
|Cl
 
3
]
3.DB.30Chloroxiphite
Pb
 
3
CuCl
 
2
(OH)
 
2
O
 
2
3.DB.35Hematophanite
Pb
 
4
Fe
 
3
O
 
8
(OH,Cl)
3.DB.40Parkinsonite
(Pb,Mo,[])
 
8
O
 
8
Cl
 
2
3.DB.45Murdochite
PbCu
 
6
O
 
8-x
(Cl,Br)
 
2x
 x<=0.5
3.DB.50Yedlinite
Pb
 
6
(Cl,OH)
 
6
Cr
3+
 
(OH,O)
 
8
Related Minerals - Hey's Index Grouping:
17.3.1Rustumite
Ca
 
10
(Si
 
2
O
 
7
)
 
2
(SiO
 
4
)Cl
 
2
(OH)
 
2
17.3.2Zunyite
Al
 
13
Si
 
5
O
 
20
(OH,F)
 
18
Cl
17.3.3Sodalite
Na
 
8
[Cl
 
2
|Al
 
6
Si
 
6
O
 
24
]
17.3.4Marialite
Na
 
4
[Cl|(AlSi
 
3
O
 
8
)
 
3
]
17.3.5Tugtupite
Na
 
4
[Cl|BeAlSi
 
4
O
 
12
]
17.3.6Eudialyte
Na
 
15
Ca
 
6
(Fe
2+
 
,Mn
2+
 
)
 
3
Zr
 
3
[Si
 
25
O
 
73
](O,OH,H
 
2
O)
 
3
(OH,Cl)
 
2
17.3.7Alluaivite
Na
 
19
(Ca,Mn)
 
6
(Ti,Nb)
 
3
Si
 
26
O
 
74
Cl·2H
 
2
O
17.3.8Nasonite
Pb
 
6
Ca
 
4
[Cl
 
2
|(Si
 
2
O
 
7
)
 
3
]
17.3.10Jagoite
(Pb,Ca)
 
3
FeSi
 
3
O
 
10
(Cl,OH)
17.3.11Friedelite
(Mn,Fe)
 
8
Si
 
6
O
 
15
(OH,Cl)
 
10
17.3.12Pyrosmalite-(Fe)
(Fe,Mn)
 
8
Si
 
6
O
 
15
(OH,Cl)
 
10
17.3.13Pyrosmalite
(Fe,Mn)
 
8
Si
 
16
O
 
15
(OH,Cl)
 
10
17.3.14Pyrosmalite-(Mn)
(Mn,Fe)
 
8
Si
 
6
O
 
15
(OH,Cl)
 
10
17.3.16Mcgillite
(Mn,Fe)
 
8
Si
 
6
O
 
15
(OH)
 
8
Cl
 
2
17.3.17Traskite
Ba
 
9
Fe
 
2
Ti
 
2
Si
 
12
O
 
36
(OH,Cl,F)
 
6
·6H
 
2
O
17.3.18Muirite
Ba
 
10
Ca
 
2
Mn
2+
 
Ti[(OH,Cl,F)|HSi
 
2
O
 
7
]
 
5
17.3.19Verplanckite
Ba
 
2
(Mn,Fe,Ti)Si
 
2
O
 
6
(O,OH,Cl,F)
 
2
·3H
 
2
O or near

Other Names for Asisite

Synonyms:
IMA1987-003
German names:
Asisit
Russian names:
Асисит
Spanish names:
Asisita

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 Asisite

Reference List:Rouse, R. C., Peacor, D. R., Dunn, P. J., Criddle, A. J., Stanley, C. J. and Innes, J. (1988): Asisite, a silicon-bearing lead oxychloride from the Kombat mine, South West Africa (Namibia). Am. Mineral. 73, 643-650.

Welch, M.D. (2004): Pb-Si ordering in sheet-oxychloride minerals: the super-structure of asisite, nominally Pb7SiO8Cl2. Mineralogical Magazine, 68, 247-254

Articles/Blogs about Asisite

Internet Links for Asisite

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    Localities for Asisite

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    Namibia
     
    • Otjozondjupa Region
      • Grootfontein District
        • Kombat
    		American Mineralogist (1988): 73: 643-650.
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