Mineralogy Database

Ferriwinchite Mineral Data

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General Ferriwinchite Information

Help on Chemical  Formula: Chemical Formula: ([ ],Na)(Na,Ca)2(Mg, Fe++)4Fe+++[Si8O22](OH)2
Help on Composition: Composition: Molecular Weight = 845.75 gm
   Potassium   0.42 %  K     0.50 % K2O
   Sodium      3.89 %  Na    5.24 % Na2O
   Calcium     3.70 %  Ca    5.17 % CaO
   Magnesium   8.65 %  Mg   14.34 % MgO
   Titanium    0.06 %  Ti    0.09 % TiO2
   Manganese   0.58 %  Mn    0.75 % MnO
   Aluminum    0.61 %  Al    1.15 % Al2O3
   Iron       12.48 %  Fe    7.22 % FeO /  9.82 % Fe2O3
   Silicon    25.94 %  Si   55.48 % SiO2
   Hydrogen    0.09 %  H     0.80 % H2O
   Oxygen     43.04 %  O
   Fluorine    0.56 %  F     0.56 % F
                -   %   F    -0.24 % -O=F2    
             ______        ______ 
             100.00 %      100.90 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na0.21K0.09Ca0.78Na1.22Mg3.01Mn2+0.09Fe2+0.85Ti0.01Fe3+1.04Si7.81Al0.19O22(OH)0.75F0.25
Help on Environment: Environment: One of many amphibole-group minerals in late veins in the fenite halo of the Ilmen Mountains alkaline complex.
Help on IMA Status: IMA Status: Approved IMA 1978
Help on Locality: Locality: Ilmen Mountains alkaline complex, Southern Urals. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the Fe+++ analoge of winchite.
Help on Synonym: Synonym: IMA2004-034

Ferriwinchite Image

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Comments: Deep black-blue bladed single ferriwinchite crystals embedded in white dolomite.
Location: Imerina, Madagascar. Scale: See Image.
© Rruff Database

Ferriwinchite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5446:1:0.2939
Help on Cell Dimensions: Cell Dimensions: a = 9.811, b = 18.014, c = 5.295, Z = 2; beta = 104.1° V = 907.62 Den(Calc)= 3.09
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.42(1)(020,110), 3.116(0.6)(310 ), 2.711(0.2)(151 ),3.268(0.13)(240 ), 2.8(0.1)(330 ), 3.391(0.1)(131 ),

Physical Properties of Ferriwinchite

Help on Cleavage: Cleavage: {110} Perfect, {110} Perfect
Help on Color: Color: Blue violet, Black.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: greenish gray

Optical Properties of Ferriwinchite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2204,KC= 0.2176
Ncalc = 1.67
Help on Optical Data: Optical Data: Biaxial (-), a=1.675, g=1.687, bire=0.0120, 2V(Meas)=82.
Help on Pleochroism (x): Pleochroism (x): bright brownish yellw.
Help on Pleochroism (y): Pleochroism (y): lilac.
Help on Pleochroism (z): Pleochroism (z): dark blue.

Calculated Properties of Ferriwinchite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.05 gm/cc
note: Specific Gravity of Ferriwinchite =3.09 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEFerriwinchite = 5.61 barns/electron
U=PEFerriwinchite x relectron= 17.10 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 5.92 (Gamma Ray American Petroleum Institute Units)
Concentration of Ferriwinchite per GRapi unit = 16.88 (%)

Estimated Radioactivity from Ferriwinchite - barely detectable


Ferriwinchite Classification

Help on  Dana Class: Dana Class: 66.01.03b.03 (66)Inosilicate Double-Width Unbranched Chains, W=2
  (66.01)with P=2 amphibole configuration
  (66.01.03b)Group 3, the sodic-calcic amphiboles
66.01.03b.01 Winchite [](CaNa)Mg4(Al,Fe3)Si8O22(OH)2 C 2/m 2/m
66.01.03b.01a Parvowinchite Na(NaMn)(Mg4Fe)Si8O22(OH)2 C 2/m 2/m
66.01.03b.02 Ferrowinchite [](CaNa)Fe4(Al,Fe)Si8O22(OH)2 C 2/m 2/m
66.01.03b.03 Ferriwinchite ([],Na)(Na,Ca)2(Mg,Fe)4Fe[Si8O22](OH)2 C 2/m 2/m
66.01.03b.04 Ferroferriwinchite* CaNa(Fe,Mg)4Fe[Si8O22](OH)2 C 2/m 2/m
66.01.03b.05 Barroisite [](CaNa)Mg3AlFeSi7AlO22(OH)2 C 2/m 2/m
66.01.03b.05a Aluminobarroisite! []CaNaMg3Al2(Si7Al)O22(OH)2 C 2/m 2/m
66.01.03b.06 Ferrobarroisite [](CaNa)Fe3AlFeSi7AlO22(OH)2 C 2/m 2/m
66.01.03b.06a Aluminoferrobarroisite! []CaNa(Fe2)3Al2(Si7Al)O22(OH)2 C 2/m 2/m
66.01.03b.07 Ferribarroisite CaNa(Fe,Mg)3Fe2[AlSi7O22](OH)2 C 2/m 2/m
66.01.03b.08 Ferroferribarroisite* CaNa(Fe,Mg)3Fe2[AlSi7O22](OH)2 C 2/m 2/m
66.01.03b.08a Ferri-ferrobarroisite! []CaNa(Fe)3(Fe)2(Si7Al)O22(OH)2 C 2/m 2/m
66.01.03b.09 Richterite Na(CaNa)(Mg,Fe)5[Si8O22](OH)2 C 2/m 2/m
66.01.03b.09a Fluororichterite! Na(CaNa)Mg5[Si8O22]F2 C 2/m 2/m
66.01.03b.09b Potassic-fluororichterite! (K,Na)(CaNa)Mg5[Si8O22]F2 C 2/m 2/m
66.01.03b.09c Potassicrichterite! (K,Na)(CaNa)2Mg5[Si8O22](OH,F)2 C 2/m 2/m
66.01.03b.10 Ferrorichterite Na(CaNa)Fe5[Si8O22](OH)2 C 2/m 2/m
66.01.03b.11 Magnesiokatophorite Na(CaNa)Mg4AlSi7AlO22(OH)2 C 2/m 2/m
66.01.03b.12 Katophorite Na(CaNa)Fe4(Al,Fe)Si7AlO22(OH)2 C 2/m 2/m
66.01.03b.13 Magnesioferrikatophorite Na2Ca(Mg,Fe)4FeSi7AlO22(OH)2 C 2/m 2/m
66.01.03b.14 Ferrikatophorite Na2Ca(Fe,Mg)4Fe(Si7Al)O22(OH)2 C 2/m 2/m
66.01.03b.15 Magnesiotaramite Na(CaNa)Mg3ALFe[Si6Al2O22](OH)2 C 2/m 2/m
66.01.03b.15a Aluminotaramite! Na(CaNa)(Fe3Al2)(Si6Al2)O22(OH)2 C 2/m 2/m
66.01.03b.15b Alumino-magnesiotaramite! Na(CaNa)(Mg3Al2)(Si6Al2)O22(OH)2 C 2/m 2/m
66.01.03b.15c Fluoro-alumino-magnesiotaramite! Na(CaNa)(Mg3Al2)(Si6Al2)O22F2 C 2/m 2/m
66.01.03b.16 Taramite Na(CaNa)Fe3AlFe[Si6Al2O22](OH)2 C 2/m 2/m
66.01.03b.17 Ferri-magnesiotaramite! NaCaNaMg3Fe2[Si6Al2O22](OH)2 C 2/m 2/m
66.01.03b.18 Ferritaramite Na(CaNa)(Fe,Mg)3Fe2[Si6Al2O22](OH)2 C 2/m 2/m
66.01.03b.19 Fluoropargasite! NaCa2(Mg3FeAl)5(Si6Al2O22)F2 C 2/m 2/m
66.01.03b.20 Parvo-mangano-edenite! Na(CaMn)2Mg5(Si7Al)O22(OH)2 C 2/m 2/m
66.01.03b.21 Parvo-manganotremolite! [](CaMn)2Mg5(Si7Al)O22(OH)2 C 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.DE.20 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.20 Winchite [](CaNa)Mg4(Al,Fe3)Si8O22(OH)2 C 2/m 2/m
09.DE.20 Aluminobarroisite! []CaNaMg3Al2(Si7Al)O22(OH)2 C 2/m 2/m
09.DE.20 Ferriwinchite ([],Na)(Na,Ca)2(Mg,Fe)4Fe[Si8O22](OH)2 C 2/m 2/m
09.DE.20 Ferroferriwinchite* CaNa(Fe,Mg)4Fe[Si8O22](OH)2 C 2/m 2/m
09.DE.20 Aluminoferrobarroisite! []CaNa(Fe2)3Al2(Si7Al)O22(OH)2 C 2/m 2/m
09.DE.20 Ferri-ferrobarroisite! []CaNa(Fe)3(Fe)2(Si7Al)O22(OH)2 C 2/m 2/m
09.DE.20 Ferribarroisite CaNa(Fe,Mg)3Fe2[AlSi7O22](OH)2 C 2/m 2/m
09.DE.20 Barroisite [](CaNa)Mg3AlFeSi7AlO22(OH)2 C 2/m 2/m
09.DE.20 Fluororichterite! Na(CaNa)Mg5[Si8O22]F2 C 2/m 2/m
09.DE.20 Ferrobarroisite [](CaNa)Fe3AlFeSi7AlO22(OH)2 C 2/m 2/m
09.DE.20 Magnesiotaramite Na(CaNa)Mg3ALFe[Si6Al2O22](OH)2 C 2/m 2/m
09.DE.20 Ferrikatophorite Na2Ca(Fe,Mg)4Fe(Si7Al)O22(OH)2 C 2/m 2/m
09.DE.20 Ferrorichterite Na(CaNa)Fe5[Si8O22](OH)2 C 2/m 2/m
09.DE.20 Ferrowinchite [](CaNa)Fe4(Al,Fe)Si8O22(OH)2 C 2/m 2/m
09.DE.20 Ferroferribarroisite* CaNa(Fe,Mg)3Fe2[AlSi7O22](OH)2 C 2/m 2/m
09.DE.20 Ferritaramite Na(CaNa)(Fe,Mg)3Fe2[Si6Al2O22](OH)2 C 2/m 2/m
09.DE.20 Ferri-magnesiotaramite! NaCaNaMg3Fe2[Si6Al2O22](OH)2 C 2/m 2/m
09.DE.20 Magnesioferrikatophorite Na2Ca(Mg,Fe)4FeSi7AlO22(OH)2 C 2/m 2/m
09.DE.20 Katophorite Na(CaNa)Fe4(Al,Fe)Si7AlO22(OH)2 C 2/m 2/m
09.DE.20 Parvowinchite Na(NaMn)(Mg4Fe)Si8O22(OH)2 C 2/m 2/m
09.DE.20 Potassic-fluororichterite! (K,Na)(CaNa)Mg5[Si8O22]F2 C 2/m 2/m
09.DE.20 Richterite Na(CaNa)(Mg,Fe)5[Si8O22](OH)2 C 2/m 2/m
09.DE.20 Taramite Na(CaNa)Fe3AlFe[Si6Al2O22](OH)2 C 2/m 2/m
09.DE.20 Magnesiokatophorite Na(CaNa)Mg4AlSi7AlO22(OH)2 C 2/m 2/m
09.DE.20 Potassicrichterite! (K,Na)(CaNa)2Mg5[Si8O22](OH,F)2 C 2/m 2/m
09.DE.20 Fluoro-alumino-magnesiotaramite! Na(CaNa)(Mg3Al2)(Si6Al2)O22F2 C 2/m 2/m
09.DE.20 Aluminotaramite! Na(CaNa)(Fe3Al2)(Si6Al2)O22(OH)2 C 2/m 2/m
09.DE.20 Alumino-magnesiotaramite! Na(CaNa)(Mg3Al2)(Si6Al2)O22(OH)2 C 2/m 2/m

Other Ferriwinchite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(AmMin, v91, p1203) OPTIC PROP.(AmMin, v91, p1203)
Help on See Also: See Also: Links to other databases for Ferriwinchite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Ecole des Mines de Paris
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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Print or Cut-and-Paste your Ferriwinchite Specimen Label here :


([ ],Na)(Na,Ca)2(Mg, Fe++)4Fe+++[Si8O22](OH)2
Dana No: 66.01.03b.03 Strunz No: 09.DE.20





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