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Iddingsite Mineral Data
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General Iddingsite Information
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 Chemical Formula: |
MgO.Fe2O3.3SiO2•4(H2O) |
| Composition: |
Molecular Weight = 452.31 gm |
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Magnesium 5.37 % Mg 8.91 % MgO |
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Iron 24.69 % Fe 31.77 % FeO |
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Silicon 18.63 % Si 39.85 % SiO2 |
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Hydrogen 1.78 % H 15.93 % H2O |
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Oxygen 49.52 % O |
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______ ______ |
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100.00 % 96.46 % = TOTAL OXIDE |
| Empirical Formula: |
MgFe2+2Si3O10•4(H2O) |
| Environment: |
Alteration of olivine. Iddinsite is a mixture of various hydrous silicates of iron and magnesium. |
| IMA Status: |
Discredited IMA 1966 - Valid Species (Pre-IMA) 1925 |
| Locality: |
Link to MinDat.org Location Data. |
| Name Origin: |
Named for Joseph Paxson Iddings (1857-1920), American petrologist, U.S. Geological Survey. |
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Iddingsite Image |
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Images:
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Iddingsite
Comments: Red iddingsite with green olivine. Iddingsite alteration of olivine commonly seen in thin-sections is actually a fine-grained mixture of goethite+quartz+chlorite.
Location: Amboy, San Bernadino County, California, USA.
Scale: Specimen Size 5x5x3 cm.
© John Betts - Fine Minerals |
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Iddingsite Crystallography
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| Crystal System: |
Orthorhombic |
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Physical Properties of Iddingsite
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| Cleavage: |
{???} Perfect |
| Color: |
Brown. |
| Density: |
2.5 - 2.8, Average = 2.65 |
| Habit: |
Foliated - Two dimensional platy forms. |
| Hardness: |
3 - Calcite |
| Luminescence: |
Non-fluorescent. |
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Optical Properties of Iddingsite
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| Gladstone-Dale: |
CI meas= -0.275 (Poor) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2736,KC= 0.2146
Ncalc = 1.54 - 1.6 |
| Optical Data: |
Biaxial (-), a=1.67-1.73, b=1.7-1.76, g=1.72-1.77, bire=0.0400-0.0500 |
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Calculated Properties of Iddingsite
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| Electron Density: |
Bulk Density (Electron Density)=2.65 gm/cc
note: Specific Gravity of Iddingsite =2.65 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PEIddingsite = 8.08 barns/electron
U=PEIddingsite x rElectron Density= 21.41 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Iddingsite is Not Radioactive |
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Iddingsite Classification
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| Dana Class: |
78.00.00.00 (78)Unclassified Silicate Minerals |
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(78.00)Without Dana Classification Numbers |
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(78.00.00)Unclassified Silicate |
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78.00.00.00 Almbosite? Fe5Fe4V4Si3O27 Ortho ? Ortho |
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78.00.00.00 Chelyabinskite* (Ca,Mg)3Si(OH)6(SO4,CO3)2•9(H2O) Unk Ortho |
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78.00.00.00 Cryptophyllite K2Ca[Si4O10]•5H2O P 21/n 2/m |
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78.00.00.00 IMA2007-041T Na2[Ti4O2(OH)2(SiO4)3]•6H2O R 3m 3m |
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78.00.00.00 IMA2009-001 Ba5(Ca,REE,Y)22(Ti,Nb)18(SiO4)4[(PO4),(SiO4)]4(BO3)9O22[(OH),F]43(H2O)1.5 R 3 3 |
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78.00.00.00 Iddingsite? MgO.Fe2O3.3SiO2•4(H2O) Ortho |
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78.00.00.00 Ivanyukite-Cu Cu[Ti4(OH)2O2(SiO4)3]•7H2O P 4 3m 4 3m |
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78.00.00.00 Ivanyukite-K K2[Ti4(OH)2O2(SiO4)3]•9H2O P 4 3m 4 3m |
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78.00.00.00 Ivanyukite-Na Na2[Ti4O2(OH)2(SiO4)3]•6H2O P 4 3m 4 3m |
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78.00.00.00 Plumbophyllite Pb2Si4O10•H2O P bcn 2/m 2/m 2/m |
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78.00.00.00 Sturtite? (Fe3)(Mn2,Ca,Mg)Si4O10(OH)3•10(H2O) None |
| Strunz Class: |
09.HX.00 09 - SILICATES (Germanates) |
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09.H - Unclassified Strunz Silicates |
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09.HX -Unclassified Silicate |
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09.HX.00 Iddingsite? MgO.Fe2O3.3SiO2•4(H2O) Ortho |
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09.HX.00 IMA2007-041T Na2[Ti4O2(OH)2(SiO4)3]•6H2O R 3m 3m |
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09.HX.00 Plumbophyllite Pb2Si4O10•H2O P bcn 2/m 2/m 2/m |
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09.HX.00 Cryptophyllite K2Ca[Si4O10]•5H2O P 21/n 2/m |
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Other Iddingsite Information
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| References: |
NAME( Ford32) PHYS. PROP.(Dana) OPTIC PROP.(Heinrich65) |
| See Also: |
Links to other databases for Iddingsite :
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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Print or Cut-and-Paste your Iddingsite Specimen Label here :
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Iddingsite
MgO.Fe2O3.3SiO2•4(H2O)
Dana No: 78.00.00.00 Strunz No: 09.HX.00
Locality:
Notes:
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