Iddingsite Mineral Data

Iddingsite Mineral Data

General Iddingsite Information

Chemical Formula:

MgO.Fe2O3.3SiO2·4(H2O)

Composition:

Molecular Weight = 452.31 gm

Magnesium 5.37 % Mg 8.91 % MgO

Iron 24.69 % Fe 31.77 % FeO

Silicon 18.63 % Si 39.85 % SiO₂

Hydrogen 1.78 % H 15.93 % H₂O

Oxygen 49.52 % O

______ ______

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:

Not Approved IMA

Locality:

Link to MinDat.org Location Data.

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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

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:

r_electron=2.65 gm/cc
note: r_Iddingsite=2.65 gm/cc.

Fermion Index

Fermion Index = 0.01954
Boson Index = 0.98046

Photoelectric:

PE_Iddingsite= 8.08 barns/electron
U=PE_Iddingsite x r_electron= 21.41 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Iddingsite is Not Radioactive

Iddingsite Classification

Dana Class:

78.0.0.0 (78)Unclassified Silicate Minerals

(78.0)Without Dana Classification Numbers

(Unclassified Silicate)

Strunz Class:

VIII/DX.00-00 VIII - Silicates

VIII/DX - Unclassified Strunz Silicates

VIII/DX.00 - Unclassified Silicate

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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Iddingsite

MgO.Fe2O3.3SiO2·4(H2O)
Dana No: Unknown Strunz No: VIII/DX.00-00
Locality:

Notes: