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Sobotkite

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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 type locality, Sobótka in Poland, from which it was originally described in 1976.
Later found to be an Al-rich variety of saponite.
A variety of Saponite


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Classification of SobotkiteHide

Discredited
71.3.1b.1

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
3 : Sheets of 6-membered rings with 2:1 clays

Physical Properties of SobotkiteHide

Hardness:

Optical Data of SobotkiteHide

Type:
Biaxial
RI values:
nα = 1.513 nβ = 1.525 nγ = 1.536
Max Birefringence:
δ = 0.023
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
strong

Chemical Properties of SobotkiteHide

Formula:
(K,Ca0.5)0.33(Mg0.66Al0.33)3(Si3Al)O10(OH)2 · 1-5H2O

Crystallography of SobotkiteHide

Crystal System:
Monoclinic

Other Language Names for SobotkiteHide

German:Sobotkit
Simplified Chinese:镁蒙脱石
Spanish:Sobotkita

Related Minerals - Dana Grouping (8th Ed.)Hide

71.3.1b.2SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2OMon.
71.3.1b.3SauconiteNa0.3Zn3((Si,Al)4O10)(OH)2 · 4H2OMon.
71.3.1b.4HectoriteNa0.3(Mg,Li)3(Si4O10)(F,OH)2Mon.
71.3.1b.5PimeliteNi3Si4O10(OH)2·4H2OHex.
71.3.1b.6Stevensite(Ca,Na)xMg3-x(Si4O10)(OH)2Mon.
71.3.1b.7Yakhontovite(Ca,Na)0.5(Cu,Fe,Mg)2(Si4O10)(OH)2 · 3H2OMon.
71.3.1b.8ZincsiliteZn3(Si4O10)(OH)2 · 4H2OMon.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for SobotkiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Czeslaw Haranczyk and Karol Prchazka (1974) Hydrous magnesium-nickel silicates from Wiry, Lower Silesia. Prace Muzeum Ziemi, 22, 3-64 (in Polish, with English summary, p.56-62)
In meteorites: AE Rubin 1997 MPS 32 231-47.

Internet Links for SobotkiteHide

Localities for SobotkiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Chile
 
  • Arica and Parinacota Region
    • Arica Province
      • Los Camarones
Howard Minerals specimens, April 1984; Diederik Visser photo.
Italy
 
  • Emilia-Romagna
    • Ferrara Province
      • Cento
        • Renazzo
Buseck, P. R., and Hua, X. (1993) Matrices of carbonaceous chondrite meteorites. Annual Review of Earth & Planetary Sciences, 21, 255-305.
Poland
 
  • Lower Silesia (Dolnośląskie)
    • Wiry
Czeslaw Haranczyk and Karol Prchazka (1974) Hydrous magnesium-nickel silicates from Wiry, Lower Silesia. Prace Muzeum Ziemi, 22, 3-64 (in Polish, with English summary, p.56-62)
USA
 
  • Texas
    • DeWitt Co.
Tony Nikischer
Mineral and/or Locality  
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