General Iddingsite Information 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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Images:
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Iddingsite Crystallography Crystal System: |
Orthorhombic |
| Physical Properties of Iddingsite Cleavage: |
{???} Perfect |
Color: |
Brown. |
Density: |
2.5 - 2.8, Average = 2.65 |
Habit: |
Foliated - Two dimensional platy forms. |
Hardness: |
3 - Calcite |
Luminescence: |
Non-fluorescent. |
| Optical Properties of Iddingsite 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 |
| Calculated Properties of Iddingsite Electron Density: |
Bulk Density (Electron Density)=2.65 gm/cc |
note: Specific Gravity of Iddingsite =2.65 gm/cc. 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. Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Iddingsite is Not Radioactive | Iddingsite Classification 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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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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| Other Iddingsite Information 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 Search for Iddingsite using: Visit our Advertisers for Iddingsite : A Bijoux Google Search for IddingsiteAdam's Minerals Google Search for Iddingsite Cape Minerals Google Search for Iddingsite Dakota Matrix Minerals Google Search for Iddingsite Excalibur Mineral Corp. Google Search for Iddingsite Exceptional Minerals Google Search for Iddingsite John Betts Fine Minerals Search for Iddingsite McDougall Minerals Google Search for Iddingsite Mineral News Website Link Rock and Mineral Shows Google Search for Iddingsite Weinrich Minerals, Inc. Google Search for Iddingsite Ask about Iddingsite here : Print or Cut-and-Paste your Iddingsite Specimen Label here :
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