Ferrogedrite Mineral Data (original) (raw)
General Ferrogedrite Information
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 
Ferrogedrite Image
Images:
Ferrogedrite Crystallography
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 - DipyramidalH-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
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
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
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
Electron Density:
Bulk Density (Electron Density)=3.46 gm/cc
note: Specific Gravity of Ferrogedrite =3.54 gm/cc.
Fermion Index:
Fermion Index = 0.01
Boson Index = 0.99
Photoelectric:
PEFerrogedrite = 9.86 barns/electron
U=PEFerrogedrite x rElectron Density= 34.09 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ferrogedrite is Not Radioactive
Ferrogedrite Classification
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
66.01.02.01 Magnesioanthophyllite? (Mg,Fe)7Si8O22(OH)2 P nma 2/m 2/m 2/m
66.01.02.02 Anthophyllite []Mg7Si8O22(OH)2 P nma 2/m 2/m 2/m
66.01.02.02a Protoanthophyllite! (Mg,Fe)7Si8O22(OH)2 Pnmn 2/m 2/m 2/m
66.01.02.03 Ferro-anthophyllite []Fe7Si8O22(OH)2 P nma 2/m 2/m 2/m
66.01.02.03a Protoferro-anthophyllite! (Fe,Mn)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m
66.01.02.03b Protomangano-ferro-anthophyllite! (Mn,Fe)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m
66.01.02.04 Sodicanthophyllite NaMg7Si8O22(OH)2 P nma 2/m 2/m 2/m
66.01.02.04a Sodic-ferro-anthophyllite! NaFe7Si8O22(OH)2 P nma 2/m 2/m 2/m
66.01.02.05 Magnesiogedrite? (Mg,Fe)5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m
66.01.02.06 Gedrite []Mg5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m
66.01.02.07 Ferrogedrite []Fe5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m
66.01.02.07a Sodic-ferrogedrite! NaFe6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m
66.01.02.08 Sodicgedrite NaMg6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m
66.01.02.09 Magnesioholmquistite Li2(Mg,Fe)3Al2Si8O22(OH)2 P nma 2/m 2/m 2/m
66.01.02.10 Holmquistite [](Li2Mg3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m
66.01.02.11 Ferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m
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
09.DE.05 Ferro-anthophyllite []Fe7Si8O22(OH)2 P nma 2/m 2/m 2/m
09.DE.05 Anthophyllite []Mg7Si8O22(OH)2 P nma 2/m 2/m 2/m
09.DE.05 Ferrogedrite []Fe5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m
09.DE.05 Gedrite []Mg5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m
09.DE.05 Ferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m
09.DE.05 Holmquistite [](Li2Mg3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m
09.DE.05 Cummingtonite []Mg7Si8O22(OH)2 C 2/m 2/m
09.DE.05 Clinoferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 C 2/m 2/m
09.DE.05 Grunerite []Fe7Si8O22(OH)2 C 2/m 2/m
09.DE.05 Magnesiocummingtonite (Mg,Fe)7Si8O22(OH)2 C 2/m 2/m
09.DE.05 Manganogrunerite []Mn2Fe5Si8O22(OH) C 2/m 2/m
09.DE.05 Magnesioanthophyllite? (Mg,Fe)7Si8O22(OH)2 P nma 2/m 2/m 2/m
09.DE.05 Protomangano-ferro-anthophyllite! (Mn,Fe)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m
09.DE.05 Sodicgedrite NaMg6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m
09.DE.05 Sodic-ferro-anthophyllite! NaFe7Si8O22(OH)2 P nma 2/m 2/m 2/m
09.DE.05 Sodic-ferrogedrite! NaFe6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m
09.DE.05 Sodicanthophyllite NaMg7Si8O22(OH)2 P nma 2/m 2/m 2/m
09.DE.05 Permanganogrunerite! []Mn4(Fe)3(Si8O22)(OH)2 C 2/m 2/m
09.DE.05 Protoferro-anthophyllite! (Fe,Mn)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m
09.DE.05 Fluoro-sodic-pedrizite! NaLi2(Mg2Al2Li)S5Si8O22F2 C 2/m 2/m
09.DE.05 Sodic-ferri-ferropedrizite! NaLi2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m
09.DE.05 Manganocummingtonite Na(Na,Mn)2(Mg4,Fe)5Si8O22(OH)2 C 2/m 2/m
09.DE.05 Protoanthophyllite! (Mg,Fe)7Si8O22(OH)2 Pnmn 2/m 2/m 2/m
09.DE.05 Ferri-clinoferroholmquistite! []Li2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m
09.DE.05 Sodic-ferripedrizite! Na(LiNa)(Fe2Mg2Li)Si8O22(OH,F)2 C 2/m 2/m
09.DE.05 Ferripedrizite! NaLi2(Fe2Mg2Li)Si8O22(OH)2 C 2/m 2/m
Other Ferrogedrite Information
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:
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]
Visit our Advertisers for Ferrogedrite :
A Bijoux Google Search for Ferrogedrite
Adam's Minerals Google Search for Ferrogedrite
Cape Minerals Google Search for Ferrogedrite
Dakota Matrix Minerals Google Search for Ferrogedrite
Excalibur Mineral Corp. Google Search for Ferrogedrite
Exceptional Minerals Google Search for Ferrogedrite
John Betts Fine Minerals Search for Ferrogedrite
McDougall Minerals Google Search for Ferrogedrite
Mineral News Website Link
Rock and Mineral Shows Google Search for Ferrogedrite
Weinrich Minerals, Inc. Google Search for Ferrogedrite
Ask about Ferrogedrite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espa�ol
Print or Cut-and-Paste your Ferrogedrite Specimen Label here :
Ferrogedrite
[ ]Fe++5Al2Si6Al2O22(OH)2
Dana No: 66.01.02.07 Strunz No: 09.DE.05
Locality:
Notes: