Asisite Mineral Data

Asisite Mineral Data
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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 Name Pronunciation: Name Pronunciation: Asisite Say ASISITE
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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drag2 - RMB Resize/Rotate
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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 Diaphaneity: Diaphaneity: 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
Ncalc = 2.14
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: Bulk Density (Electron Density)=6.47 gm/cc
note: Specific Gravity of Asisite =7.94 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.19
Boson Index = 0.81
Help on Photoelectric: Photoelectric: PEAsisite =1,653.44 barns/electron
U=PEAsisite x rElectron Density=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: 10.02.07.01 (10)Oxyhalides and Hydroxyhalides
  (10.02)where A (O,OH) Xq
  (10.02.07)Dana Group
 
10.02.07.01 Asisite Pb12(SiO4)O8Cl4 I 4/mmm 4/m 2/m 2/m
Help on Strunz Class: Strunz Class: 03.DB.40 03 - HALIDES
  03.D - Oxyhalides, Hydroxyhalides and Related Double Halides
  03.DB -With Pb, Cu, etc.
 
03.DB.40 Asisite Pb12(SiO4)O8Cl4 I 4/mmm 4/m 2/m 2/m
 
03.DB.40 Parkinsonite (Pb,Mo,[])8O8Cl2 I 4/mmm 4/m 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Asisite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

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

Asisite

Pb12(SiO4)O8Cl4
Dana No: 10.02.07.01 Strunz No: 03.DB.40
Locality:

 

Notes: