Ilvaite Mineral Data

Advertisment

A Bijoux.com is an online store specialized in the sale on the internet of precious stones , gems , minerals and jewels for individuals and professionals

Dakota Matrix was founded in 1996 and has offered systematic and rare mineral specimens online since 1998.

Weinrich Minerals, A Dealer in Fine Mineral Specimens - Since 1989. We buy collections and single high quality specimens.

General Ilvaite Information

Chemical Formula:

CaFe++2Fe+++Si2O7O(OH)

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

Empirical Formula:

CaFe²⁺₃(SiO₄)₂(OH)

Environment:

Occurs with magnetite ore bodies, with zinc and copper ores, and in contact deposits and zeolites.

IMA Status:

Valid Species (Pre-IMA) 1811

Locality:

Capo Calamita, on Elba. Link to MinDat.org Location Data.

Name Origin:

Named ilvaite from the Latin name of the island of Elba.

Name Pronunciation:

Ilvaite

Synonym:

Breislakite - fiberous

Lievrite

Yenite

Ilvaite Image

Images:

Ilvaite Quartz

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

Images:

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

Axial Ratios:

a:b:c =0.6759:1:0.4503

Cell Dimensions:

a = 8.78, b = 12.99, c = 5.85, Z = 4; V = 667.21 Den(Calc)= 4.07

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/I_o): 2.709(1), 2.839(0.85), 7.28(0.7),

Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above

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

Warning: this large pop-up is very compute intensive and may not work well with some computers.

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Cleavage:

{010} Distinct, {001} Distinct

Color:

Iron black, Dark grayish black.

Density:

3.99 - 4.05, Average = 4.01

Diaphaneity:

Opaque

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Columnar - Forms columns

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luminescence:

Non-fluorescent.

Luster:

Sub Metallic

Streak:

brownish black

Optical Properties of Ilvaite

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

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

Electron Density:

Bulk Density (Electron Density)=3.96 gm/cc
note: Specific Gravity of Ilvaite =4.07 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Ilvaite= 14.01 barns/electron
U=PE_Ilvaite x rElectron Density= 55.51 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ilvaite is Not Radioactive

Ilvaite Classification

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

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

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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 - GeoScienceWorld
8 - Glendale Community College
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - WWW-MINCRYST

Search for Ilvaite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Ilvaite :

A Bijoux Google Search for Ilvaite
Dakota Matrix Minerals Google Search for Ilvaite
John Betts Fine Minerals Search for Ilvaite
McDougall Minerals Google Search for Ilvaite
Rock and Mineral Shows Google Search for Ilvaite
Weinrich Minerals, Inc. Google Search for Ilvaite

Ask about Ilvaite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: