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


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

Physical Properties of SobotkiteHide


Optical Data of SobotkiteHide

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:

Chemical Properties of SobotkiteHide

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

Crystallography of SobotkiteHide

Crystal System:

Other Language Names for SobotkiteHide

Simplified Chinese:镁蒙脱石

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.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.
  • Arica and Parinacota
    • Arica Province
      • Los Camarones
Howard Minerals specimens, April 1984; Diederik Visser photo.
  • 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.
  • Lower Silesian Voivodeship
    • Świdnica Co.
      • Gmina Marcinowice
        • 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)
  • Texas
    • DeWitt Co.
Tony Nikischer
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