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 % K₂O

Sodium 0.17 % Na 0.24 % Na₂O

Calcium 2.36 % Ca 3.30 % CaO

Magnesium 3.92 % Mg 6.51 % MgO

Aluminum 5.18 % Al 9.78 % Al₂O₃

Iron 22.38 % Fe 21.02 % FeO / 8.64 % Fe₂O₃

Silicon 15.31 % Si 32.75 % SiO₂

Hydrogen 1.98 % H 17.67 % H₂O

Oxygen 48.62 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca_0.31Na_0.04K_0.01Fe²⁺_1.54Mg_0.85Fe³⁺_0.45Si_2.87Al_1.01Fe³⁺_0.12O_9.67(OH)_2.33ï¿½4(H₂O)

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?

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

By Intensity(I/I_o): 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:

PE_{Ferrosaponite}= 7.68 barns/electron
U=PE_{Ferrosaponite} 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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