Asisite
A valid IMA mineral species
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About Asisite
Formula:
Pb7SiO9Cl2
Colour:
Yellow to yellow-green, red
Lustre:
Adamantine
Hardness:
3½
Specific Gravity:
8.041 (Calculated)
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".
Note: Asisite from the Kombat mine has been sold as either "lorettoite" or "chubutite".
Unique Identifiers
Mindat ID:
391
Long-form identifier:
mindat:1:1:391:5
Similar Names
| Arisite | ||
| Arisite-(Ce) | A valid IMA mineral species | NaCe2(CO3)2[F2x(CO3)1-x]F |
| Arisite-(La) | A valid IMA mineral species | NaLa2(CO3)2[F2x(CO3)1-x]F |
IMA Classification of Asisite
Approved
IMA Formula:
Pb2+7SiO8Cl2
Approval year:
1987
First published:
1988
Classification of Asisite
3.DB.40
3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
B : With Pb, Cu, etc.
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
10 : OXYHALIDES AND HYDROXYHALIDES
2 : A(O,OH)Xq
17.3.9
17 : Silicates Containing other Anions
3 : Silicates with chloride (including aluminosilicates)
17 : Silicates Containing other Anions
3 : Silicates with chloride (including aluminosilicates)
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Ass | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Asisite
Adamantine
Transparency:
Transparent
Colour:
Yellow to yellow-green, red
Streak:
Light yellow to white
Hardness:
3½ on Mohs scale
Hardness:
VHN50=146 - 186 kg/mm2 - Vickers
Cleavage:
Perfect
{001}
{001}
Density:
8.041 g/cm3 (Calculated)
Optical Data of Asisite
Type:
Uniaxial (-)
RI values:
nω = 2.39 nε = 2.32
Max. Birefringence:
δ = 0.070
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Anisotropism:
Not noticeable in air, only weakly so in oil, rotation tints of gray
Bireflectance:
Not perceptible, except at grain boundaries
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 400nm | 20.2% | 20.7% |
| 450nm | 17.9% | 18.9% |
| 500nm | 16.9% | 17.9% |
| 550nm | 16.2% | 17.15% |
| 600nm | 15.7% | 16.7% |
| 650nm | 15.35% | 16.3% |
| 700nm | 15.1% | 16.1% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 20.7%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Gray
Internal Reflections:
Abundant uncolored reflections in plane-polarized light, brilliant pale greenish yellow between crossed polars
Pleochroism:
Non-pleochroic
Chemistry of Asisite
Mindat Formula:
Pb7SiO9Cl2
Element Weights:
Elements listed:
Crystallography of Asisite
Crystal System:
Tetragonal
Class (H-M):
4/mmm(4/m2/m2/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)
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
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View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0014572 | Asisite | Welch M D (2004) Pb-Si ordering in sheet-oxychloride minerals: the super-structure of asisite, nominally Pb7SiO8Cl2 Mineralogical Magazine 68 247-254 |  | 2004 | Kombat mine, Namibia | 0 | 293 |
| 0001166 | Asisite | Rouse R C, Peacor D R, Dunn P J, Criddle A J, Stanley C J, Innes J (1988) Asisite, a silicon-bearing lead oxychloride from the Kombat mine, South West Africa (Namibia) American Mineralogist 73 643-650 | | 1988 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.957 Å | (100) |
| 2.752 Å | (60) |
| 1.627 Å | (60) |
| 1.602 Å | (50) |
| 3.46 Å | (40) |
| 1.984 Å | (40) |
| 1.747 Å | (40) |
Comments:
Kombat mine, Namiba. Data from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47h : [Near-surface oxidized, dehydrated minerals] |
Type Occurrence of Asisite
General Appearance of Type Material:
Yellow to greenish-yellow, 0.5 mm, platy crystals.
Place of Conservation of Type Material:
Geological Survey of Canada, Ottawa, Ontario, Canada, number GSC no. 64565.
British Museum of Natural History, London, UK, number 1986,304.
British Museum of Natural History, London, UK, number 1986,304.
Geological Setting of Type Material:
Manganese silicate lens.
Associated Minerals at Type Locality:
Synonyms of Asisite
Other Language Names for Asisite
Common Associates
Associations Based on Photo Data:
| 15 photos of Asisite associated with Hausmannite | Mn2+Mn3+2O4 |
| 2 photos of Asisite associated with Sahlinite | Pb14(AsO4)2O9Cl4 |
| 2 photos of Asisite associated with Baryte | BaSO4 |
| 1 photo of Asisite associated with Cahnite | Ca2[B(OH)4](AsO4) |
| 1 photo of Asisite associated with Hereroite | [Pb32(O,◻)21](AsO4)2[(Si,As,V,Mo)O4]2Cl10 |
| 1 photo of Asisite associated with Vladkrivovichevite | [Pb32O18][Pb4Mn2O]Cl14(BO3)8 · 2H2O |
| 1 photo of Asisite associated with Kombatite | Pb14(VO4)2O9Cl4 |
| 1 photo of Asisite associated with Barysilite | Pb8Mn2+[Si2O7]3 |
Related Minerals - Strunz-mindat Grouping
| 3.DB. | Rickturnerite | Pb7O4[Mg(OH)4](OH)Cl3 |
| 3.DB.05 | Diaboleite | Pb2CuCl2(OH)4 |
| 3.DB.10 | Pseudoboleite | Pb31Cu24Cl62(OH)48 |
| 3.DB.15 | Boleite | KPb26Ag9Cu24(OH)48Cl62 |
| 3.DB.20 | Cumengeite | Pb21Cu20Cl42(OH)40 · 6H2O |
| 3.DB.25 | Bideauxite | Pb2AgCl3(F,OH)2 |
| 3.DB.30 | Chloroxiphite | Pb3CuO2Cl2(OH)2 |
| 3.DB.35 | Hematophanite | Pb4Fe3O8(OH,Cl) |
| 3.DB.40 | Parkinsonite | Pb7MoO9Cl2 |
| 3.DB.40 | Janchevite | Pb9V5+(O10.25◻0.75)Cl2.5 |
| 3.DB.45 | Eddavidite | Cu12Pb2O15Br2 |
| 3.DB.45 | Murdochite | Cu12Pb2O15Cl2 |
| 3.DB.50 | Yedlinite | Pb6Cr3+Cl6(O,OH,H2O)8 |
| 3.DB.55 | Siidraite | Pb2Cu(OH)2I3 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Asisite
mindat.org URL:
https://www.mindat.org/min-391.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Asisite
Reference List:
Rouse, Roland C., Peacor, Donald R., Dunn, Pete J., Criddle, Alan J., Stanley, Chris J., Innes, John (1988) Asisite, a silicon-bearing lead oxychloride from the Kombat mine, South West Africa (Namibia) American Mineralogist, 73 (5-6) 643-650
Localities for Asisite
Showing 4 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Greece | |
| SEM-EDS |
Namibia (TL) | |
| Rouse et al. (1988) |
Poland | |
| Ł. Kruszewski PXRD & pXRF data (paper in preparation) |
Spain | |
| Georges FAVREAU collection + EDX ... |
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Santa Elisa smelter slag locality, Mazarrón, Murcia, Spain