Asisite Mineral Data + Say ASISITE

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General Asisite Information
Help on Chemical Formula: Chemical Formula: Pb12(SiO4)O8Cl4
Help on Composition: Composition: Molecular Weight = 1,652.35 gm
   Silicon    0.93 %  Si    2.00 % SiO2
   Lead      87.78 %  Pb   94.56 % PbO
   Chlorine   4.44 %  Cl    4.44 % Cl
               -   %  Cl   -1.00 % -O=Cl2
   Oxygen     6.85 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb7(Si)0.55O7.07Cl2.07
Help on IMA Status: IMA Status: Approved IMA 1988
Help on Locality: Locality: Kombat mine, located 37 km east of Otavi and 49 km south of Tsumeb in the north-central part of Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: The root name "Asis" means "drinking place" in the local Nama language and is also the name of the farm on which the Kombat mine is located.
Help on Synonym: Synonym: ICSD 202630
  PDF 45-1429
 

Asisite Image

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Asisite

Comments: Orange brownish asisite on matrix.
Location: Kombat Mine, Kombat, Namibia. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Asisite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:5.85713
Help on Cell Dimensions: Cell Dimensions: a = 3.8932, c = 22.803, Z = 1; V = 345.63 Den(Calc)= 7.94
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4/mmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.957(1), 1.627(0.6), 2.752(0.6),
Click Here for Large Asisite Structure Window Crystal Structure:

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Rouse R C , Peacor D R , Dunn P J , Criddle A J , Stanley C J , Innes J , American Mineralogist , 73 (1988) p.643-650, Asisite, a silicon-bearing lead oxychloride from the Kombat mine, South West, Africa (Namibia)

 

Physical Properties of Asisite

Help on Cleavage: Cleavage: [001] Perfect
Help on Color: Color: Green yellow, Yellow.
Help on Diaphaniety: Diaphaniety: Transparent
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Adamantine
Help on Streak: Streak: yellow white
 

Optical Properties of Asisite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.185 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1707,KC= 0.144
Help on Optical Data: Optical Data: Uniaxial (-), e=2.32, w=2.39, bire=0.0700.
Help on RL Anisotrophism: RL Anisotrophism: Weak in oil, gray, not noticable in air.
Help on RL Color: RL Color: Gray with internal reflections.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Asisite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   20.60   20.70 
   
 420 nm   19.80   19.80 
 440 nm   19.00   19.15 
 460 nm   18.50   18.65 
 480 nm   18.10   18.20 
 500 nm   17.70   17.90 
 520 nm   17.40   17.55 
 540 nm   17.15   17.30 
 560 nm   16.90   17.00 
 580 nm   16.70   16.80 
 600 nm   16.60   16.70 
 620 nm   16.50   16.50 
 640 nm   16.30   16.40 
 660 nm   16.20   16.30 
 680 nm   16.10   16.20 
 700 nm   16.00   16.10 
Calculated Relative Intensity Colors of Asisite in Air
Relative
Intensity		    0%   60% 100% 120% 180% 240% 300% 360% 420% 480% 520%
R1                      
R2                      
 

Calculated Properties of Asisite

Help on Electron Density: Electron Density:

relectron=6.47 gm/cc
note: rAsisite =7.94 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.19445
Boson Index = 0.80555
Help on Photoelectric: Photoelectric:

PEAsisite =1,653.44 barns/electron
U=PEAsisite x relectron=10701.44 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Asisite is Not Radioactive
 

Asisite Classification
Help on Dana Class: Dana Class: 10.2.7.1 (10)Oxyhalides and Hydroxyhalides
  (10.2)where A (O,OH) Xq
  (10.2.7)Dana Group
 
10.2.7.1 Asisite Pb12(SiO4)O8Cl4 I 4/mmm 4/m 2/m 2/m
Help on Strunz Class: Strunz Class: III/D.11-50 III - Halogenides
  III/D - Oxi-halogenides with Pb - Bi - Sb and related compounds
  III/D.11 - Mendipite - Onoratoite series
 
III/D.11-10 Mendipite Pb3Cl2O2 P 212121 2 2 2
 
III/D.11-15 Damaraite Pb3O2(OH)Cl Pmc2 mm2
 
III/D.11-17 Chubutite* Pb7O6Cl2 Unk Ortho
 
III/D.11-20 Penfieldite Pb2Cl3(OH) P 6/mmm 6/m 2/m 2/m
 
III/D.11-30 Blixite Pb2Cl(O,OH)2 Unk Ortho
 
III/D.11-35 Mereheadite! Pb2O(OH)Cl C 2/c 2/m
 
III/D.11-40 Sundiusite Pb10(SO4)Cl2O8 C 2,Cm,C 2/m Mono
 
III/D.11-50 Asisite Pb12(SiO4)O8Cl4 I 4/mmm 4/m 2/m 2/m
 
III/D.11-55 Parkinsonite (Pb,Mo,[])8O8Cl2 I 4/mmm 4/m 2/m 2/m
 
III/D.11-60 Thorikosite Pb3(Sb,As)O3(OH)Cl2 I 4/mmm 4/m 2/m 2/m
 
III/D.11-65 Philolithite! Pb12O6Mn(Mg,Mn)2(Mn,Mg)4(SO4)(CO3)4Cl4(OH)12 P 41/nnm 4/m 2/m 2/m
 
III/D.11-70 Pinalite Pb3(WO4)OCl2 Amam 2/m 2/m 2/m
 
III/D.11-80 Nadorite PbSbO2Cl Bmmb 2/m 2/m 2/m
 
III/D.11-90 Perite PbBiO2Cl Bmmb 2/m 2/m 2/m
 
III/D.11-100 Heliophyllite Pb6As2O7Cl4 Unk Ortho
 
III/D.11-110 Ecdemite Pb6As2O7Cl4 Unk Tetra
 
III/D.11-120 Onoratoite Sb8O11Cl2 C 2/m 2/m
 

Other Asisite Information
Help on References: References: NAME( MinRec, 22:422) PHYS. PROP.(AmMin 73:643-650, AmMin 90:274) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: See Also: Links to other databases for Asisite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Print or Cut-and-Paste your Asisite Specimen Label here :

Asisite

Pb12(SiO4)O8Cl4
Dana No: 10.2.7.1 Strunz No: III/D.11-50
Locality:

 

Notes:

 
 
   
 
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