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Asisite Mineral Data
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General Asisite Information
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 Chemical Formula: |
Pb12(SiO4)O8Cl4 |
| Composition: |
Molecular Weight = 1,652.35 gm |
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Silicon 0.93 % Si 2.00 % SiO2 |
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Lead 87.78 % Pb 94.56 % PbO |
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Chlorine 4.44 % Cl 4.44 % Cl |
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- %
Cl -1.00 % -O=Cl2 |
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Oxygen 6.85 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Pb7(Si)0.55O7.07Cl2.07 |
| IMA Status: |
Approved IMA 1988 |
| 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. |
| 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. |
| Name Pronunciation: |
Asisite  |
| Synonym: |
ICSD 202630 |
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PDF 45-1429 |
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Asisite Image |
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Images:
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Asisite Crystallography
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| Axial Ratios: |
a:c = 1:5.85713 |
| Cell Dimensions: |
a = 3.8932, c = 22.803, Z = 1; V = 345.63 Den(Calc)= 7.94 |
| Crystal System: |
Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: I 4/mmm |
| X Ray Diffraction: |
By Intensity(I/Io): 2.957(1), 1.627(0.6), 2.752(0.6), |
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Physical Properties of Asisite
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| Cleavage: |
{001} Perfect |
| Color: |
Green yellow, Yellow. |
| Diaphaneity: |
Transparent |
| Habit: |
Platy - Sheet forms (e.g. micas). |
| Hardness: |
3.5 - Copper Penny |
| Luster: |
Adamantine |
| Streak: |
yellow white |
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Optical Properties of Asisite
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| Gladstone-Dale: |
CI calc= -0.185 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1707,KC= 0.144
Ncalc = 2.14 |
| Optical Data: |
Uniaxial (-), e=2.32, w=2.39, bire=0.0700. |
| RL Anisotrophism: |
Weak in oil, gray, not noticable in air. |
| RL Color: |
Gray with internal reflections. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Asisite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
20.60 |
20.70 |
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| 420 nm |
19.80 |
19.80 |
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| 440 nm |
19.00 |
19.15 |
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| 460 nm |
18.50 |
18.65 |
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| 480 nm |
18.10 |
18.20 |
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| 500 nm |
17.70 |
17.90 |
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| 520 nm |
17.40 |
17.55 |
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| 540 nm |
17.15 |
17.30 |
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| 560 nm |
16.90 |
17.00 |
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| 580 nm |
16.70 |
16.80 |
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| 600 nm |
16.60 |
16.70 |
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| 620 nm |
16.50 |
16.50 |
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| 640 nm |
16.30 |
16.40 |
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| 660 nm |
16.20 |
16.30 |
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| 680 nm |
16.10 |
16.20 |
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| 700 nm |
16.00 |
16.10 |
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Calculated Relative Intensity Colors of Asisite in Air
Relative
Intensity |
0% |
60% |
100% |
120% |
180% |
240% |
300% |
360% |
420% |
480% |
520% |
| R1 |
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| R2 |
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Calculated Properties of Asisite
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| Electron Density: |
Bulk Density (Electron Density)=6.47 gm/cc
note: Specific Gravity of Asisite =7.94 gm/cc.
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| Fermion Index: |
Fermion Index = 0.19
Boson Index = 0.81 |
| Photoelectric: |
PEAsisite =1,653.44 barns/electron
U=PEAsisite x rElectron Density=10701.44 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Asisite is Not Radioactive |
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Asisite Classification
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| Dana Class: |
10.02.07.01 (10)Oxyhalides and Hydroxyhalides |
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(10.02)where A (O,OH) Xq |
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(10.02.07)Dana Group |
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10.02.07.01 Asisite Pb12(SiO4)O8Cl4 I 4/mmm 4/m 2/m 2/m |
| Strunz Class: |
03.DB.40 03 - HALIDES |
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03.D - Oxyhalides, Hydroxyhalides and Related Double Halides |
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03.DB -With Pb, Cu, etc. |
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03.DB.40 Asisite Pb12(SiO4)O8Cl4 I 4/mmm 4/m 2/m 2/m |
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03.DB.40 Parkinsonite (Pb,Mo,[])8O8Cl2 I 4/mmm 4/m 2/m 2/m |
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Other Asisite Information
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| References: |
NAME( MinRec, 22:422) PHYS. PROP.(AmMin 73:643-650, AmMin 90:274) OPTIC PROP.(AntBidBlaNic2) |
| 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 :
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Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in
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Print or Cut-and-Paste your Asisite Specimen Label here :
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Asisite
Pb12(SiO4)O8Cl4
Dana No: 10.02.07.01 Strunz No: 03.DB.40
Locality:
Notes:
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