Mineralogy Database

Sobotkite Mineral Data

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General Sobotkite Information

Help on Chemical  Formula: Chemical Formula: (K,Ca0.5)0.33(Mg,Al)3(Si3Al)O10(OH)2•1-5(H2O)
Help on Composition: Composition: Molecular Weight = 441.54 gm
   Potassium   0.89 %  K     1.07 % K2O
   Calcium     2.72 %  Ca    3.81 % CaO
   Magnesium  11.56 %  Mg   19.17 % MgO
   Aluminum   11.61 %  Al   21.94 % Al2O3
   Silicon    19.08 %  Si   40.82 % SiO2
   Hydrogen    1.60 %  H    14.28 % H2O
   Oxygen     52.54 %  O
             ______        ______ 
             100.00 %      101.09 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K0.1Ca0.33(Mg0.7)3(Al0.3)Si3AlO10(OH)2•2.5(H2O)
Help on Environment: Environment: Laterite deposit on ultra-basic rocks. Discredited in 1987 as being aluminum saponite
Help on IMA Status: IMA Status: Discredited IMA 1987 - Approved IMA 1976
Help on Locality: Locality: Mt. Sobotka, Godolow-Jordanow massif, Wiry, Lower Silesia, Poland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named in 1976 for the locality.
Help on Synonym: Synonym: Discredited IMA 1987

Sobotkite Image

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Comments: Massive, fine-grained rose-colored sobotkite (saponite).
Location: Cuya, Atacama, Chile. Scale: See Specimen Tray.
© Diederik Visser

Sobotkite Crystallography

Help on Crystal System: Crystal System: Monoclinic Space Group: Unk.
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.48(0.9), 14.5(0.7), 1.527(0.6),2.51(0.6), 2.61(0.6), 2.35(0.5), 2.41(0.5),

Physical Properties of Sobotkite

Help on Color: Color: Pale green.
Help on Density: Density: 2.31
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 3 - Calcite

Optical Properties of Sobotkite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.001 (Superior) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2271,KC= 0.2273
Ncalc = 1.53
Help on Optical Data: Optical Data: Biaxial (?), a=1.513, b=1.525, g=1.536, bire=0.0230

Calculated Properties of Sobotkite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.33 gm/cc
note: Specific Gravity of Sobotkite =2.31 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PESobotkite = 1.77 barns/electron
U=PESobotkite x relectron= 4.13 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 12.88 (Gamma Ray American Petroleum Institute Units)
Concentration of Sobotkite per GRapi unit = 7.76 (%)

Estimated Radioactivity from Sobotkite - barely detectable


Sobotkite Classification

Help on  Dana Class: Dana Class: 71.03.01b.01 (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.03)with 2:1 clays
  (71.03.01b)Smectite group (Trioctahedral Smectites)
71.03.01b.01 Sobotkite? (K,Ca0.5)0.33(Mg,Al)3(Si3Al)O10(OH)2•1-5(H2O) Unk. Mono
71.03.01b.02 Saponite (Ca/2,Na)0,3(Mg,Fe)3(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m
71.03.01b.02a Ferrosaponite! Ca0.3(Fe,Mg,Fe)3(Si,Al)4O10(OH)2•4(H2O) C? Mono
71.03.01b.03 Sauconite Na0,3Zn3(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m
71.03.01b.04 Hectorite Na0,3(Mg,Li)3Si4O10(OH)2 C 2/m 2/m
71.03.01b.05 Pimelite? Ni3Si4O10(OH)2•4(H2O) Unk. Hex
71.03.01b.06 Stevensite (Ca0.5,Na)0.33(Mg,Fe)3Si4O10(OH)2•n(H2O) Unk (ORTH ?) Mono
71.03.01b.07 Yakhontovite (Ca,K)0.5(Cu,Fe,Mg)2Si4O10(OH)2•3(H2O) C 2/m 2/m
71.03.01b.08 Zincsilite Zn3Si4O10(OH)2•4(H2O)(?) C 2/m ? 2/m
Help on  Strunz Class: Strunz Class: 09.EC.45 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
09.EC.45 Griffithite* 4(Mg,Fe,Ca)O.(Al,Fe)2O3.5SiO2•7(H2O) Mono
09.EC.45 Hectorite Na0,3(Mg,Li)3Si4O10(OH)2 C 2/m 2/m
09.EC.45 Swinefordite (Li,Ca0.5,Na)0.72(Li,Al,Mg)2.66(Si,Al)4O10(OH,F)2•2(H2O) C 2/m (MON or ORTH) 2/m
09.EC.45 Zincsilite Zn3Si4O10(OH)2•4(H2O)(?) C 2/m ? 2/m
09.EC.45 Saponite (Ca/2,Na)0,3(Mg,Fe)3(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m
09.EC.45 Sauconite Na0,3Zn3(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m
09.EC.45 Spadaite MgSiO2(OH)2•(H2O)(?) Ortho
09.EC.45 Sobotkite? (K,Ca0.5)0.33(Mg,Al)3(Si3Al)O10(OH)2•1-5(H2O) Unk. Mono
09.EC.45 Stevensite (Ca0.5,Na)0.33(Mg,Fe)3Si4O10(OH)2•n(H2O) Unk (ORTH ?) Mono
09.EC.45 Ferrosaponite! Ca0.3(Fe,Mg,Fe)3(Si,Al)4O10(OH)2•4(H2O) C? Mono

Other Sobotkite Information

Help on References: References: NAME( Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Sobotkite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: 71.03.01b.01 Strunz No: 09.EC.45





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