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Asisite

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About AsisiteHide

Formula:
Pb7SiO9Cl2
Colour:
Yellow to yellow-green, red
Hardness:
Crystal System:
Tetragonal
Name:
Named after the Asis farm where the Kombat mine is located.
The Si analogue of janchevite.

Note: Asisite from the Kombat mine has been sold as either "lorettoite" or "chubutite".


Classification of AsisiteHide

Approved
3/D.10-190
3.DB.40

3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
B : With Pb, Cu, etc.
10.2.7.1

10 : OXYHALIDES AND HYDROXYHALIDES
2 : A(O,OH)Xq
17.3.9

17 : Silicates Containing other Anions
3 : Silicates with chloride (including aluminosilicates)

Physical Properties of AsisiteHide

Colour:
Yellow to yellow-green, red
Hardness:
3½ on Mohs scale

Optical Data of AsisiteHide

Type:
Uniaxial (-)
RI values:
nω = 2.390 nε = 2.320
Max Birefringence:
δ = 0.070
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High

Chemical Properties of AsisiteHide

Formula:
Pb7SiO9Cl2
IMA Formula:
Pb7SiO8Cl2

Crystallography of AsisiteHide

Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
I4/mmm
Cell Parameters:
a = 3.897(2) Å, c = 22.81(2) Å
Ratio:
a:c = 1 : 5.853
Unit Cell 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)

Type Occurrence of AsisiteHide

Synonyms of AsisiteHide

Other Language Names for AsisiteHide

Dutch:Asisiet
German:Asisit
Italian:Asisite
Russian:Асисит
Spanish:Asisita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Hausmannite8 photos of Asisite associated with Hausmannite on mindat.org.
Sahlinite2 photos of Asisite associated with Sahlinite on mindat.org.
Cahnite1 photo of Asisite associated with Cahnite on mindat.org.
Hereroite1 photo of Asisite associated with Hereroite on mindat.org.
Vladkrivovichevite1 photo of Asisite associated with Vladkrivovichevite on mindat.org.
Kombatite1 photo of Asisite associated with Kombatite on mindat.org.
Barysilite1 photo of Asisite associated with Barysilite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

3.DB.RickturneritePb7O4[Mg(OH)4](OH)Cl3Orth. mmm (2/m 2/m 2/m) : Pnma
3.DB.05DiaboleitePb2CuCl2(OH)4Tet. 4mm : P4mm
3.DB.10PseudoboleitePb31Cu24Cl62(OH)48Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
3.DB.15BoleiteKPb26Ag9Cu24(OH)48Cl62Iso. m3m (4/m 3 2/m) : Pm3m
3.DB.20CumengeitePb21Cu20Cl42(OH)40 · 6H2OTet. 4/mmm (4/m 2/m 2/m) : I4/mmm
3.DB.25BideauxitePb2AgCl3(F,OH)2Iso. m3m (4/m 3 2/m) : Fd3m
3.DB.30ChloroxiphitePb3CuO2Cl2(OH)2Mon. 2/m : P21/m
3.DB.35HematophanitePb4Fe3O8(OH,Cl)Tet. 4/mmm (4/m 2/m 2/m)
3.DB.40ParkinsonitePb7MoO9Cl2 Tet.
3.DB.45MurdochitePbCu6O8-x(Cl,Br)2x where x<=0.5Iso. m3m (4/m 3 2/m) : Fm3m
3.DB.50YedlinitePb6Cr3+Cl6(O,OH,H2O)8Trig. 3 : R3

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

17.3.1RustumiteCa10(Si2O7)2(SiO4)(OH)2Cl2Mon.
17.3.2ZunyiteAl13Si5O20(OH,F)18ClIso. 4 3m : F4 3m
17.3.3SodaliteNa8(Al6Si6O24)Cl2Iso. 4 3m : P4 3n
17.3.4MarialiteNa4Al3Si9O24ClTet. 4/m : I4/m
17.3.5TugtupiteNa4BeAlSi4O12ClTet. 4 : I4
17.3.6EudialyteNa15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2Trig. 3m (3 2/m) : R3m
17.3.7AlluaiviteNa19(Ca,Mn)6(Ti,Nb)3Si26O74Cl · 2H2OTrig. 3m (3 2/m) : R3m
17.3.8NasonitePb6Ca4(Si2O7)3Cl2Hex.
17.3.10JagoitePb18Fe3+4[Si4(Si,Fe3+)6][Pb4Si16(Si,Fe)4]O82Cl6Hex.
17.3.11FriedeliteMn2+8Si6O15(OH,Cl)10Mon. 2/m : B2/m
17.3.12Pyrosmalite-(Fe)Fe2+8Si6O15(OH,Cl)10Trig. 3m (3 2/m) : P3m1
17.3.13Pyrosmalite
17.3.14Pyrosmalite-(Mn)Mn2+8Si6O15(OH,Cl)10Trig.
17.3.16Mcgillite(Mn,Fe)8Si6O15(OH)8Cl2Mon. 2/m : B2/m
17.3.17TraskiteBa21Ca(Fe2+,Mn,Ti)4(Ti,Fe,Mg)12(Si12O36)(Si2O7)6(O,OH)30Cl6·14H2O Hex.
17.3.18MuiriteBa10Ca2Mn2+Ti[(OH,Cl,F)|HSi2O7]5Tet. 4/mmm (4/m 2/m 2/m) : P4/mmm
17.3.19VerplanckiteBa2(Mn,Fe,Ti)Si2O6(O,OH,Cl,F)2 · 3H2O or nearHex.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for AsisiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.

Internet Links for AsisiteHide

Localities for AsisiteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Namibia (TL)
 
  • Otjozondjupa Region
    • Grootfontein District
      • Kombat
American Mineralogist (1988): 73: 643-650.
Mineral and/or Locality  
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