Sobotkite Mineral Data

General Sobotkite Information

Chemical Formula:

(K,Ca0.5)0.33(Mg,Al)3(Si3Al)O10(OH)2•1-5(H2O)

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

Empirical Formula:

K_0.1Ca_0.33(Mg_0.7)3(Al_0.3)Si₃AlO₁₀(OH)₂•2.5(H₂O)

Environment:

Laterite deposit on ultra-basic rocks. Discredited in 1987 as being aluminum saponite

IMA Status:

Discredited IMA 1987 - Approved IMA 1976

Locality:

Mt. Sobotka, Godolow-Jordanow massif, Wiry, Lower Silesia, Poland. Link to MinDat.org Location Data.

Name Origin:

Named in 1976 for the locality.

Synonym:

Discredited IMA 1987

Sobotkite Image

Images:

Sobotkite

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

Sobotkite Crystallography

Crystal System:

MonoclinicSpace Group: Unk.

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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

Color:

Pale green.

Density:

2.31

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

3 - Calcite

Optical Properties of Sobotkite

Gladstone-Dale:

CI meas= 0.001 (Superior) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2271,KC= 0.2273
Ncalc = 1.53

Optical Data:

Biaxial (?), a=1.513, b=1.525, g=1.536, bire=0.0230

Calculated Properties of Sobotkite

Electron Density:

Bulk Density (Electron Density)=2.33 gm/cc
note: Specific Gravity of Sobotkite =2.31 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Sobotkite= 1.77 barns/electron
U=PE_Sobotkite x r_electron= 4.13 barns/cc.

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

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

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

References:

NAME( Dana8) OPTIC PROP.(Dana8)

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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Ask about Sobotkite here :
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Mindat.org's Discussion Groups
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Print or Cut-and-Paste your Sobotkite Specimen Label here :

Sobotkite

(K,Ca0.5)0.33(Mg,Al)3(Si3Al)O10(OH)2•1-5(H2O)
Dana No: 71.03.01b.01 Strunz No: 09.EC.45
Locality:

Notes: