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Ilvaite

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Formula:
CaFe3+Fe22+(Si2O7)O(OH)
System:
Orthorhombic
Colour:
Iron-black, dark grayish ...
Hardness:
5½ - 6
Member of:
Name:
For "Ilva", the old name of Elba Island, on which the type locality is situated
The ferrous iron analogue of manganilvaite.

Classification of Ilvaite

Approved, 'Grandfathered' (first described prior to 1959)
9.BE.07

9 : SILICATES (Germanates)
B : Sorosilicates
E : Si2O7 groups, with additional anions; cations in octahedral [6] and greater coordination
56.2.3.3

56 : SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
2 : Si2O7 Groups and O, OH, F, and H2O with cations in [4] and/or >[4] coordination
14.22.7

14 : Silicates not Containing Aluminum
22 : Silicates of Fe and Ca
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Type Occurrence of Ilvaite

Occurrences of Ilvaite

Geological Setting:
Contact metasomatic rocks and iron deposits.

Physical Properties of Ilvaite

Sub-Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Iron-black, dark grayish black
Streak:
Black, inclining to green or brown
Hardness (Mohs):
5½ - 6
Tenacity:
Brittle
Cleavage:
Distinct/Good
Distinct on {001} {010}
Fracture:
Irregular/Uneven
Density:
3.99 - 4.05 g/cm3 (Measured)    4.064 g/cm3 (Calculated)

Crystallography of Ilvaite

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 8.800Å, b = 13.019Å, c = 5.852Å
Ratio:
a:b:c = 0.676 : 1 : 0.449
Unit Cell Volume:
V 670.45 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Prismatic, columnar, radiating, compact massive,
Comment:
Orthorhombic (Pbnm; cell parameters given refer to this space-group symmetry) or monoclinic (P21/a; 13.0103(5), 8.8039(4), 5.8517(3), 90.209(5))

Crystallographic forms of Ilvaite

Crystal Atlas:
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Ilvaite no.2 - Goldschmidt (1913-1926)
Ilvaite no.26 - Goldschmidt (1913-1926)
Ilvaite no.70 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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Edge Lines | Miller Indicies | Axes

Transparency
Opaque | Translucent | Transparent

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Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
X-Ray Powder Diffraction Data:
d-spacingIntensity
7.305 (70)
2.865 (70)
2.849 (93)
2.840 (93)
2.721 (70)
2.714 (70)
2.676 (100)

Optical Data of Ilvaite

Type:
Biaxial (+)
RI values:
nα = 1.727 nβ = 1.870 nγ = 1.883
2V:
Measured: 20° to 30°, Calculated: 30°
Max Birefringence:
δ = 0.156
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
Strong r
Colour in reflected light:
light gray to bluish gray, pinkish red to violet
Pleochroism:
Strong
Comments:
X= dark green
Y= yellow-brown to dark brown
Z= dark brown

Chemical Properties of Ilvaite

Formula:
CaFe3+Fe22+(Si2O7)O(OH)
All elements listed in formula:
Common Impurities:
Mg,Mn

Relationship of Ilvaite to other Species

Member of:
Other Members of Group:
CortesognoiteCaV2(Si2O7)(OH)2·H2O
HennomartiniteSrMn23+(Si2O7)(OH)2 · H2O
ItoigawaiteSrAl2(Si2O7)(OH)2 · H2O
LawsoniteCaAl2(Si2O7)(OH)2 · H2O
ManganilvaiteCaFe2+Fe3+Mn2+(Si2O7)O(OH)
NoelbensoniteBaMn23+(Si2O7)(OH)2 · H2O
9.BE.02Wadsleyite(Mg,Fe2+)2(SiO4)
9.BE.05HennomartiniteSrMn23+(Si2O7)(OH)2 · H2O
9.BE.05LawsoniteCaAl2(Si2O7)(OH)2 · H2O
9.BE.05NoelbensoniteBaMn23+(Si2O7)(OH)2 · H2O
9.BE.05ItoigawaiteSrAl2(Si2O7)(OH)2 · H2O
9.BE.07ManganilvaiteCaFe2+Fe3+Mn2+(Si2O7)O(OH)
9.BE.10SuoluniteCa2(H2Si2O7) · H2O
9.BE.12JaffeiteCa6(Si2O7)(OH)6
9.BE.15FresnoiteBa2Ti(Si2O7)O
9.BE.17BaghdaditeCa3(Zr,Ti)(Si2O7)O2
9.BE.17BurpaliteNa2CaZr(Si2O7)F2
9.BE.17CuspidineCa4(Si2O7)(F,OH)2
9.BE.17Hiortdahlite(Na,Ca)2Ca4Zr(Mn,Ti,Fe)(Si2O7)2(F,O)4
9.BE.17Janhaugite(Na,Ca)3(Mn2+,Fe2+)3(Ti,Zr,Nb)2(Si2O7)2O2(OH,F)2
9.BE.17Låvenite(Na,Ca)2(Mn2+,Fe2+)(Zr,Ti)(Si2O7)(O,OH,F)2
9.BE.17Niocalite(Ca,Nb)4(Si2O7)(O,OH,F)2
9.BE.17NormanditeNaCa(Mn,Fe)(Ti,Nb,Zr)(Si2O7)OF
9.BE.17WöhleriteNaCa2(Zr,Nb)(Si2O7)(O,OH,F)2
9.BE.17Hiortdahlite INa4Ca8Zr2(Nb,Mn,Ti,Fe,Mg,Al)2(Si2O7)4O3F5
9.BE.17MarianoiteNa2Ca4(Nb,Zr)2(Si2O7)2(O,F)4
9.BE.20Mosandrite(◻,Ca,Na)3(Ca,REE)4Ti(Si2O7)2[H2O,OH,F]4 · H2O
9.BE.20Nacareniobsite-(Ce)Na3Ca3(Ce,La,Nd)Nb(Si2O7)2OF3
9.BE.22GötzeniteNaCa6Ti(Si2O7)2OF3
9.BE.22HainiteNa2Ca4(Y,REE)Ti(Si2O7)2OF3
9.BE.22RosenbuschiteNa6Ca6Zr3Ti(Si2O7)4O2F6
9.BE.22KochiteNa3Ca2MnZrTi(Si2O7)2OF3
9.BE.23DovyreniteCa6Zr(Si2O7)2(OH)4
9.BE.25Barytolamprophyllite(Ba,Na)2(Na,Ti,Fe3+)4Ti2(Si2O7)2O(OH,F)
9.BE.25EricssoniteBaMn22+Fe3+(Si2O7)O(OH)
9.BE.25Lamprophyllite(Na,Mn2+)3(Sr,Na)2(Ti,Fe3+)3(Si2O7)2O2(OH,O,F)2
9.BE.25Ericssonite-2OBaMn22+Fe3+(Si2O7)O(OH)
9.BE.25SeidozeriteNa4MnZr2Ti(Si2O7)2O2F2
9.BE.25NabalamprophylliteNa3(Ba,Na)2Ti3(Si2O7)2O2(OH,F)2
9.BE.25GrenmariteNa4MnZr3(Si2O7)2O2F2
9.BE.25SchülleriteBa2Na(Mn,Ca)(Fe3+,Mg,Fe2+)2Ti2(Si2O7)2(O,F)4
9.BE.25LileyiteBa2(Na,Fe,Ca)3MgTi2(Si2O7)2O2F2
9.BE.27MurmaniteNa2Ti2(Si2O7)O2 · 2H2O
9.BE.30EpistoliteNa2(Nb,Ti)2(Si2O7)O2 · nH2O
9.BE.32LomonosoviteNa5Ti2(Si2O7)(PO4)O2
9.BE.35VuonnemiteNa11Ti4+Nb2(Si2O7)2(PO4)2O3(F,OH)
9.BE.37SoboleviteNa13Ca2Mn2Ti3(Si2O7)2(PO4)4O3F3
9.BE.40InneliteNa2CaBa4Ti3(Si2O7)2(SO4)2O4
9.BE.40PhosphoinneliteNa3Ba4Ti3(Si2O7)2(PO4,SO4)2O2F
9.BE.42YoshimuraiteBa2Mn2Ti(Si2O7)(PO4)O(OH)
9.BE.45QuadruphiteNa14Ca2Ti4(Si2O7)2(PO4)2O2F
9.BE.47PolyphiteNa5(Na4Ca2)Ti2(Si2O7)(PO4)3O2F2
9.BE.50BornemaniteNa6BaTi2Nb(Si2O7)2(PO4)O2(OH)F
9.BE.50ShkatulkaliteNa10Mn2+Ti3Nb3(Si2O7)6(OH)2F · 12H2O
9.BE.55BafertisiteBa2Fe42+Ti2(Si2O72O2(OH)2F2
9.BE.55HejtmaniteBa2(Mn2+,Fe2+)4Ti2(Si2O7)2O2(OH)2F2
9.BE.55Bykovaite(Ba,Na,K)2(Na,Ti,Mn)4(Ti,Nb)2(Si2O7)2O2(H2O,F,OH)2 · 3.5H2O
9.BE.55Nechelyustovite(Ba,Sr,K)2(Na,Ti,Mn)4(Ti,Nb)2(Si2O7)2O2(O,H2O,F)2 · 4.5H2O
9.BE.60Delindeite(Na,K)2(Ba,Ca)2(Ti,Fe,Al)3(Si2O7)2O2(OH)2 · 2H2O
9.BE.65BusseniteNa2Ba2Fe2+Ti(Si2O7)(CO3)(OH)3F
9.BE.67JinshajiangiteBaNaFe42+Ti2(Si2O7)2O2(OH)2F
9.BE.67PerraultiteBaNaMn42+Ti2(Si2O7)2O2(OH)2F
9.BE.67SurkhobiteNaCaBa2Mn8Ti4(Si2O7)4O5F5
9.BE.70Karnasurtite-(Ce)(Ce,La,Th)(Ti,Nb)(Al,Fe)(Si2O7)(OH)4 · 3H2O
9.BE.70Perrierite-(Ce)Ce4MgFe23+Ti2(Si2O7)2O8
9.BE.70Strontiochevkinite(Sr,La,Ce,Ca)4Fe2+(Ti,Zr)2Ti2(Si2O7)2O8
9.BE.70Chevkinite-(Ce)(Ce,La,Ca,Th)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2(Si2O7)2O8
9.BE.70Polyakovite-(Ce)(Ce,Ca)4(Mg,Fe2+)(Cr3+,Fe3+)2(Ti,Nb)2(Si2O7)2O8
9.BE.70RengeiteSr4ZrTi4(Si2O7)2O8
9.BE.70MatsubaraiteSr4Ti5(Si2O7)2O8
9.BE.70Dingdaohengite-(Ce)(Ce,La)4Fe2+(Ti,Fe2+,Mg,Fe2+)2Ti2(Si2O7)2O8
9.BE.70Maoniupingite-(Ce)(Ce,Ca)4(Fe3+,Ti,Fe2+,◻)(Ti,Fe3+,Fe2+,Nb)4(Si2O7)2O8
9.BE.70Perrierite-(La)(La,Ce,Ca)4(Fe,Mn2+,Mg)Fe23+(Ti,Fe3+)2(Si2O7)2O8
9.BE.70UKI-2008-(SiO:SrTiZr)Sr4ZrTi4(Si2O7)2O8
9.BE.70Hezuolinite(Sr,REE)4Zr(Ti,Fe3+)4(Si2O7)2O8
9.BE.72FersmaniteCa4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3
9.BE.75BelkoviteBa3(Nb,Ti)6(Si2O7)2O12
9.BE.77NasonitePb6Ca4(Si2O7)3Cl2
9.BE.80KentrolitePb2Mn23+(Si2O7)O2
9.BE.80MelanotekitePb2Fe23+(Si2O7)O2
9.BE.82TilleyiteCa5(Si2O7)(CO3)2
9.BE.85KillalaiteCa6.4(H0.6Si2O7)2(OH)2
9.BE.87Stavelotite-(La)(La,Nd,Ca)3Mn32+Cu(Mn3+,Fe3+,Mn4+)26(Si2O7)6O30
9.BE.90Biraite-(Ce)Ce2Fe2+(Si2O7)(CO3)
9.BE.92Cervandonite-(Ce)(Ce,Nd,La)(Fe3+,Fe2+,Ti,Al)3O2(Si2O7)(As3+O3)(OH)
9.BE.95BatisiviteBaV83+Ti6(Si2O7)O22
14.22.1HedenbergiteCaFe2+Si2O6
14.22.2Pyroxferroite(Fe,Mn,Ca)SiO3
14.22.3 Ferro-akermaniteCa2FeSi2O7
14.22.4KirschsteiniteCaFe2+SiO4
14.22.5TungusiteCa4Fe2Si6O15(OH)6
14.22.6Ferro-actinolite☐{Ca2}{Fe52+}(Si8O22)(OH)2
14.22.8Julgoldite-(Fe2+)Ca2Fe2+Fe23+(Si2O7)(SiO4)(OH)2 · H2O
14.22.9AndraditeCa3Fe23+(SiO4)3

Other Names for Ilvaite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Ilvaite

Reference List:
Rodolico F.(1931): Osservazioni cristallografiche sull'ilvaite. Periodico di Mineralogia – Roma pp. 122-132.

Federico M. – (1957) Sulla breislakite. Periodico di Mineralogia – Roma pp. 191-210.

Cecchini A., Franzini M., Troysi M.(1984): La microdurezza alla penetrazione dell'ilvaite. Rend. Soc.It. Min. Petr., 39, 711-715.

Zeitschrift für Kristallographie (1987): 179: 415.

European Journal of Mineralogy: 6: 465-479.

Internet Links for Ilvaite

Specimens:
The following Ilvaite specimens are currently listed for sale on minfind.com.

Localities for Ilvaite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
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