Ilvaite Mineral Data

Ilvaite Mineral Data
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General Ilvaite Information

Help on Chemical Formula: Chemical Formula: CaFe++2Fe+++Si2O7O(OH)
Help on Composition: Composition: Molecular Weight = 408.79 gm
   Calcium    9.80 %  Ca   13.72 % CaO
   Iron      40.98 %  Fe   52.73 % FeO
   Silicon   13.74 %  Si   29.40 % SiO2
   Hydrogen   0.25 %  H     2.20 % H2O
   Oxygen    35.22 %  O
            ______        ______ 
            100.00 %       98.04 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaFe2+3(SiO4)2(OH)
Help on Environment: Environment: Occurs with magnetite ore bodies, with zinc and copper ores, and in contact deposits and zeolites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1811
Help on Locality: Locality: Capo Calamita, on Elba. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named ilvaite from the Latin name of the island of Elba.
Help on Name Pronunciation: Name Pronunciation: Ilvaite Say ILVAITE
Help on Synonym: Synonym: Breislakite - fiberous
  Lievrite
  Yenite
 

Ilvaite Image

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Ilvaite   Quartz

Comments: Black, prismatic ilvaite with quartz.
Location: First Sovietskij mine, Dalnjegorsk, Russia. Scale: 3.5 x 4.5 cm.
© Fabre Minerals
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Ilvaite   Hedenbergite

Comments: Doubly terminated, black ilvaite on crystals of greenish gray hedenbergite with minor galena.
Location: First Sovietsky mine, Dalnjegorsk, Russia. Scale: 4 x 2.8 x 1.8 cm.
© Fabre Minerals

Ilvaite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.6759:1:0.4503
Help on Cell Dimensions: Cell Dimensions: a = 8.78, b = 12.99, c = 5.85, Z = 4; V = 667.21 Den(Calc)= 4.07
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbnm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.709(1), 2.839(0.85), 7.28(0.7),
Help on Forms: Forms:

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Forms: ( 1 0 1) ( 0 1 0) ( 1 1 0) ( 1 1 1) ( 1 2 0)

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Ghose S , Sen Gupta P K , Schlemper E O , American Mineralogist , 70 (1985) p.1248-1252, Electron ordering in ilvaite, a mixed-valence iron, silicate: crystal structure refinement at 138 K, Sample: T = 138 K

View Additional jPOWD Structure files for Ilvaite
[1] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [2] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [3] [30] [31] [32] [33] [34] [35] [36] [37] [4] [5] [6] [7] [8] [9]
 

Physical Properties of Ilvaite

Help on Cleavage: Cleavage: {010} Distinct, {001} Distinct
Help on Color: Color: Iron black, Dark grayish black.
Help on Density: Density: 3.99 - 4.05, Average = 4.01
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Columnar - Forms columns
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Hardness: Hardness: 5.5-6 - Knife Blade-Orthoclase
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: brownish black
 

Optical Properties of Ilvaite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.046 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.033 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2031,KPDmeas= 0.2056,KC= 0.1966
Ncalc = 1.78 - 1.8
Help on Optical Data: Optical Data: Biaxial (-), a=1.727, b=1.87, g=1.883, bire=0.1560, 2V(Calc)=30, 2V(Meas)=20-30. Dispersion strong, r < v.
 

Calculated Properties of Ilvaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.96 gm/cc
note: Specific Gravity of Ilvaite =4.07 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEIlvaite = 14.01 barns/electron
U=PEIlvaite x rElectron Density= 55.51 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ilvaite is Not Radioactive
 

Ilvaite Classification
Help on Dana Class: Dana Class: 56.02.03.03 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.02)with cations in [4] and/or >[4] coordination
  (56.02.03)Lawsonite - Ilvaite group
 
56.02.03.01 Lawsonite CaAl2Si2O7(OH)2•(H2O) Ccmm 2/m 2/m 2/m
 
56.02.03.02 Hennomartinite SrMn2Si2O7(OH)2•(H2O) C mcm 2/m 2/m 2/m
 
56.02.03.03 Ilvaite CaFe2FeSi2O7O(OH) Pbnm 2/m 2/m 2/m
 
56.02.03.04 Noelbensonite! BaMn2(Si2O7)(OH)2•(H2O) C mcm 2/m 2/m 2/m
 
56.02.03.05 Itoigawaite! SrAl2Si2O7(OH)2•(H2O) C mcm 2/m 2/m 2/m
 
56.02.03.06 Manganilvaite! CaFeFe(Mn,Fe)(Si2O7)O(OH) P 21/a 2/m
Help on Strunz Class: Strunz Class: 09.BE.07 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
 
09.BE.07 Ilvaite CaFe2FeSi2O7O(OH) Pbnm 2/m 2/m 2/m
 
09.BE.07 Manganilvaite! CaFeFe(Mn,Fe)(Si2O7)O(OH) P 21/a 2/m
 

Other Ilvaite Information
Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Ilvaite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - CalTech Mineral Spectroscopy
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - Glendale Community College
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - MinMax(Deutsch)
14 - MinMax(English)
15 - Mineralienatlas (Deutsch)
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - WWW-MINCRYST

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Print or Cut-and-Paste your Ilvaite Specimen Label here :

Ilvaite

CaFe++2Fe+++Si2O7O(OH)
Dana No: 56.02.03.03 Strunz No: 09.BE.07
Locality:

 

Notes: