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Sobotkite

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Formula:
(K,Ca
 
0.5
)
 
0.33
(Mg
 
0.66
Al
 
0.33
)
 
3
(Si
 
3
Al)O
 
10
(OH)
 
2
 · 1-5H
 
2
O
System:MonoclinicHardness:3
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

Classification of Sobotkite

IMA status:Discredited 1987
Explanation of status:= Al-rich saponite
Dana 8th edition ID:71.3.1b.1

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

Hardness (Mohs):3

Crystallography of Sobotkite

Crystal System:Monoclinic

Optical Data of Sobotkite

Type:Biaxial
RI values: nα = 1.513 nβ = 1.525 nγ = 1.536
Maximum Birefringence:δ = 0.023

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:strong

Chemical Properties of Sobotkite

Formula:
(K,Ca
 
0.5
)
 
0.33
(Mg
 
0.66
Al
 
0.33
)
 
3
(Si
 
3
Al)O
 
10
(OH)
 
2
 · 1-5H
 
2
O
Essential elements:Al, H, K, Mg, O, Si
All elements listed in formula:Al, Ca, H, K, Mg, O, Si

Other Names for Sobotkite

Other Languages:
German:Sobotkit
Spanish:Sobotkita

Other Information

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

References for Sobotkite

Reference List:

- +
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 Sobotkite

Search Engines:
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  • Search for minerals at Heliodor
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • Find Sobotkite on www.crystalclassics.co.uk
  • Search for - Sobotkite - on e-Rocks Mineral Sales & Auctions
  • The Arkenstone - Fine Minerals
  • Fine Minerals from Weinrich Minerals, Inc.
  • Fabre Minerals - search for Sobotkite specimens
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    • Localities for Sobotkite

    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Chile
     
    • Arica and Parinacota Region
      • Arica Province
        • Los Camarones
    		Howard Minerals specimens, April 1984; Diederik Visser photo.
    Poland
     
    • Lower Silesia (Dolnośląskie)
      • Gogołów-Jordanów Massif
        • 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
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