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Ferrogedrite Mineral Data |
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Ferrogedrite Mineral Data |
General Ferrogedrite Information |
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 Chemical Formula: |
[ ]Fe++5Al2Si6Al2O22(OH)2 | ||
| Composition: |
Molecular Weight = 941.68 gm | ||
| Aluminum 11.46 % Al 21.66 % Al2O3 | |||
| Iron 29.65 % Fe 38.15 % FeO | |||
| Silicon 17.90 % Si 38.28 % SiO2 | |||
| Hydrogen 0.21 % H 1.91 % H2O | |||
| Oxygen 40.78 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Fe2+5Al4Si6O22(OH)2 | ||
| IMA Status: |
Approved IMA 1978 | ||
| Locality: |
Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for its composition and the original gederite location at Heas, Gedres, France. | ||
| Name Pronunciation: |
Ferrogedrite + Pronunciation  |
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Ferrogedrite Image | |||
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Images:
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Ferrogedrite Crystallography |
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| Axial Ratios: |
a:b:c =1.0317:1:0.2962 | ||
| Cell Dimensions: |
a = 18.51, b = 17.94, c = 5.315, Z = 4; V = 1,764.95 Den(Calc)= 3.54 | ||
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma | ||
| X Ray Diffraction: |
By Intensity(I/Io): 8.23(1), 3.04(0.7), 3.22(0.2),2.51(0.1), 2.58(0.1), 2.68(0.1), 4.63(0.1), 8.95(0.1), | ||
Physical Properties of Ferrogedrite |
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| Cleavage: |
{110} Perfect, {010} Indistinct, {100} Indistinct | ||
| Color: |
Green, Brownish green, Brown, Greenish blue. | ||
| Density: |
3.57 | ||
| Diaphaneity: |
Transparent to Subopaque | ||
| Hardness: |
5.5-6 - Knife Blade-Orthoclase | ||
| Luster: |
Vitreous - Silky | ||
| Streak: |
gray white | ||
Optical Properties of Ferrogedrite |
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| Gladstone-Dale: |
CI meas= 0.061 (Fair) - where the CI = (1-KPDmeas/KC) CI calc= 0.053 (Good) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.192,KPDmeas= 0.1904,KC= 0.2027 Ncalc = 1.72 |
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| Optical Data: |
Biaxial (-), a=1.642-1.694, b=1.649-1.71, g=1.661-1.722, bire=0.0190-0.0280, 2V(Calc)=76-80, 2V(Meas)=82. | ||
Calculated Properties of Ferrogedrite |
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| Electron Density: |
Bulk Density (Electron Density)=3.46 gm/cc note: Specific Gravity of Ferrogedrite =3.54 gm/cc. |
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| Fermion Index: |
Fermion Index = 0.01 Boson Index = 0.99 |
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| Photoelectric: |
PEFerrogedrite = 9.86 barns/electron U=PEFerrogedrite x rElectron Density= 34.09 barns/cc. |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Ferrogedrite is Not Radioactive |
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Ferrogedrite Classification |
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| Dana Class: |
66.01.02.07 (66)Inosilicate Double-Width Unbranched Chains, W=2 | ||
| (66.01)with P=2 amphibole configuration | |||
| (66.01.02)Dana Group | |||
| Strunz Class: |
09.DE.05 09 - SILICATES (Germanates) | ||
| 09.D - Inosilicates* Structural terminology according to Liebau (1985) | |||
| 09.DE -Inosilicates with 2-periodic double chains, Si4O11; amphibole family | |||
Other Ferrogedrite Information |
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) | ||
| See Also: |
Links to other databases for Ferrogedrite : 1 - Am. Min. Crystal Structure Database 2 - Athena 3 - EUROmin Project 4 - Ecole des Mines de Paris 5 - GeoScienceWorld 6 - Google Images 7 - Google Scholar 8 - Handbook of Mineralogy (MinSocAm) 9 - Handbook of Mineralogy (UofA) 10 - MinDAT 11 - Mineralienatlas (Deutsch) 12 - Online Mineral Museum 13 - QUT Mineral Atlas 14 - Ruff.Info Search for Ferrogedrite using: Visit our Advertisers for Ferrogedrite : Ask about Ferrogedrite here : Print or Cut-and-Paste your Ferrogedrite Specimen Label here :
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