Ferrosaponite Mineral Data
General Ferrosaponite Information
Chemical Formula:
Ca0.3(Fe++,Mg,Fe+++)3(Si,Al)4O10(OH)2•4(H2O)
Composition:
Molecular Weight = 526.49 gm
Potassium 0.07 % K 0.09 % K2 O
Sodium 0.17 % Na 0.24 % Na2 O
Calcium 2.36 % Ca 3.30 % CaO
Magnesium 3.92 % Mg 6.51 % MgO
Aluminum 5.18 % Al 9.78 % Al2 O3
Iron 22.38 % Fe 21.02 % FeO / 8.64 % Fe2 O3
Silicon 15.31 % Si 32.75 % SiO2
Hydrogen 1.98 % H 17.67 % H2 O
Oxygen 48.62 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Ca0.31 Na0.04 K0.01 Fe2+ 1.54 Mg0.85 Fe3+ 0.45 Si2.87 Al1.01 Fe3+ 0.12 O9.67 (OH)2.33 �4(H2 O)
Environment:
Hydrothermal mineral. Smectite group
IMA Status:
Approved IMA 2003 (Dana # Added)
Locality:
Levoberezhye "Iceland Spar" deposit near the Nizhnyaya Tunguska River, Evenkiya, Siberia, Russia. Link to MinDat.org Location Data.
Name Origin:
Named as the Fe2+ dominant analog of saponte.
Synonym:
IMA2002-028
Ferrosaponite Image
Images:
Ferrosaponite
Comments: Black to greenish black balls of radiating Ferrosaponite crystals on white calcite.
Location: Levoberezhye Icelandspar deposit, Nizhuyaya Tunguska river, Evenkiya, Siberia, Russia.
Scale: Not Given.
© Diederik Visser
Images:
Ferrosaponite
Comments: Holotype specimens of earthy ferrosaponite.
Location: Russia, Eastern-Siberian Region, Krasnoyarsk Territory, Evenkia, Levoberezhye Iceland Spar Deposit.
Scale: FOV 6 cm.
© German Type Specimen Catalogue
Ferrosaponite Crystallography
Axial Ratios:
a:b:c =0.5762:1:1.5731
Cell Dimensions:
a = 5.363, b = 9.306, c = 14.64, Z = 2; beta = 94.98° V = 727.90 Den(Calc)= 2.40
Crystal System:
Monoclinic Space Group: C?
X Ray Diffraction:
By Intensity(I/Io ): 3.03(1)(031), 1.549(0.9)(060), 2.429(0.9)(006), 2.585(0.9)(201), 4.72(0.9)(020), 7.37(0.9)(002), 3.8(0.8),
Physical Properties of Ferrosaponite
Cleavage:
{001} Perfect
Color:
Dark green, Brownish green.
Density:
2.49
Diaphaneity:
Translucent
Habit:
Columnar - Forms columns
Habit:
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Habit:
Spherical - Spherical, rounded aggregates.
Hardness:
2 - Gypsum
Luster:
Vitreous (Glassy)
Streak:
green
Optical Properties of Ferrosaponite
Gladstone-Dale:
CI meas = 0.017 (Superior) - where the CI = (1-KPDmeas /KC ) CI calc = -0.02 (Excellent) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.2404,KPDmeas = 0.2317,KC = 0.2358 Ncalc = 1.57 - 1.59
Optical Data:
Biaxial (-), a=1.448, b=1.641, g=1.642, bire=0.1940, 2V(Calc)=6, 2V(Meas)=5. Dispersion Calculated α index.
Calculated Properties of Ferrosaponite
Electron Density:
Bulk Density (Electron Density)=2.49 gm/cc note: Specific Gravity of Ferrosaponite =2.49 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEFerrosaponite = 7.68 barns/electronU=PEFerrosaponite x r electron = 19.15 barns/cc.
Radioactivity:
GRapi = 1.10 (Gamma Ray American Petroleum Institute Units)
Concentration of Ferrosaponite per GRapi unit = 91.21 (%)
Estimated Radioactivity from Ferrosaponite - barely detectable
Ferrosaponite Classification
Dana Class:
71.03.01b.02a (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 Ferrosaponite Information
References:
NAME( AmMin, 89:467) PHYS. PROP.(AmMin, 89:467) OPTIC PROP.(AmMin, 89:467)
See Also:
Links to other databases for Ferrosaponite :
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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Ferrosaponite
Ca0.3(Fe++,Mg,Fe+++)3(Si,Al)4O10(OH)2•4(H2O)
Dana No: 71.03.01b.02a Strunz No: 09.EC.45
Locality:
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