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Sobotkite
A variety of Saponite
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About Sobotkite
Formula:
(K,Ca0.5)0.33(Mg0.66Al0.33)3(Si3Al)O10(OH)2 · 1-5H2O
Hardness:
3
Crystal System:
Monoclinic
Name:
Named for the first recorded locality, Sobótka in Poland, from which it was originally described in 1976.
Later found to be an Al-rich variety of saponite.
Later found to be an Al-rich variety of saponite.
An Al-rich variety of saponite.
Unique Identifiers
Mindat ID:
7300 (as Sobotkite)
3528 (as Saponite)
3528 (as Saponite)
Long-form identifier:
mindat:1:1:7300:0 (as Sobotkite)
mindat:1:1:3528:2 (as Saponite)
mindat:1:1:3528:2 (as Saponite)
IMA Classification of Sobotkite
Discredited
Classification of Sobotkite
71.3.1b.1
71 : PHYLLOSILICATES Sheets of Six-Membered Rings
3 : Sheets of 6-membered rings with 2:1 clays
71 : PHYLLOSILICATES Sheets of Six-Membered Rings
3 : Sheets of 6-membered rings with 2:1 clays
Physical Properties of Sobotkite
Hardness:
3 on Mohs scale
Optical Data of Sobotkite
Type:
Biaxial
RI values:
nα = 1.513 nβ = 1.525 nγ = 1.536
Max. Birefringence:
δ = 0.023
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.
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.
Surface Relief:
Moderate
Dispersion:
strong
Chemistry of Sobotkite
Mindat Formula:
(K,Ca0.5)0.33(Mg0.66Al0.33)3(Si3Al)O10(OH)2 · 1-5H2O
Element Weights:
Crystallography of Sobotkite
Crystal System:
Monoclinic
First Recorded Occurrence of Sobotkite
Geological Setting of First Recorded Material:
Laterite on ultrabasic rock.
Other Language Names for Sobotkite
Radioactivity
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 Sobotkite
mindat.org URL:
https://www.mindat.org/min-7300.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Sobotkite
Localities for Sobotkite
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.
Chile | |
| Howard Minerals specimens +1 other reference |
Italy | |
| Buseck et al. (1993) |
Poland (FRL) | |
| See +2 other references |
USA | |
| Excalibur Mineral Corp. - Mineral News |
Cuero Crater, DeWitt County, Texas, USA