General Winchite Information
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Chemical Formula: |
[ ](CaNa)Mg4(Al,Fe3+)Si8O22(OH)2 |
Composition: |
Molecular Weight = 828.18 gm |
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Potassium 0.47 % K 0.57 % K2O |
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Sodium 2.61 % Na 3.52 % Na2O |
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Calcium 6.15 % Ca 8.60 % CaO |
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Magnesium 12.53 % Mg 20.78 % MgO |
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Manganese 0.53 % Mn 0.69 % MnO |
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Aluminum 1.01 % Al 1.91 % Al2O3 |
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Iron 3.71 % Fe 5.30 % Fe2O3 |
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Silicon 26.38 % Si 56.44 % SiO2 |
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Hydrogen 0.24 % H 2.18 % H2O |
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Oxygen 46.36 % O |
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______ ______ |
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100.00 % 99.98 % = TOTAL OXIDE |
Empirical Formula: |
Ca1.27Na0.94K0.1Mg4.27Fe3+0.55Al0.09Mn2+0.08Si7.78Al0.22O22(OH)2 |
Environment: |
Metamorphosed Mn deposits. |
IMA Status: |
Valid Species (Pre-IMA) 1906 |
Locality: |
Kajlidongri, Jhabua, Madhya Pradesh, India. Link to MinDat.org Location Data. |
Name Origin: |
Named for its composition and for Howard J. Winch, Geological survey of India. |
Synonym: |
Aluminowinchite |
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PDF 20-1390 |
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Winchite Image |
Images:
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Images:
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Winchite Sodalite
Comments: Purple sodalite with some crystal faces, supporting a very sharp, transparent winchite crystal, terminated on one end.
Location: Sar-e-Sang, Kokcha Valley, Badakshan Province, Afghanistan.
Scale: 11x10x8 mm.
© Richard Dale / Dale Minerals |
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Winchite Crystallography
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Axial Ratios: |
a:b:c =0.5444:1:0.2934 |
Cell Dimensions: |
a = 9.834, b = 18.062, c = 5.3, Z = 2; beta = 104.4° V = 911.82 Den(Calc)= 3.02 |
Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m |
X Ray Diffraction: |
By Intensity(I/Io): 2.7(1), 2.53(0.9), 8.4(0.9),3.4(0.7), 4.48(0.7), 3.12(0.5), 2.98(0.4), 2.58(0.3), |
Crystal Structure:
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Sokolova E V , Hawthorne F C , Gorbatova V , McCammon C , Schneider J , The Canadian Mineralogist , 39 (2001) p.171-177, Ferrian winchite from the Ilmen mountains, southern Urals,, Russia and some problems with the current scheme for amphibole nomenclature, Locality: Ilmen mountains, southern Urals, Russia, Note: x-coordinate of T1 and all coordinates of O6, adjusted to match reported bond lengths
View Additional jPOWD Structure files for Winchite
[1]
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Physical Properties of Winchite
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Cleavage: |
[110] Perfect |
Color: |
Cobalt blue, Violet blue. |
Density: |
2.96 |
Diaphaniety: |
Translucent |
Fracture: |
Brittle - Uneven - Very brittle fracture producing uneven fragments. |
Hardness: |
5.5 - Knife Blade |
Luster: |
Vitreous (Glassy) |
Streak: |
pale bluish gray |
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Optical Properties of Winchite
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Gladstone-Dale: |
CI meas= -0.01 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2121,KPDmeas= 0.2164,KC= 0.2142 |
Optical Data: |
Biaxial (-), a=1.629, b=1.643, g=1.65, bire=0.0210, 2V(Calc)=70, 2V(Meas)=64. Dispersion r > v strong. |
Pleochroism (x): |
colorless. |
Pleochroism (y): |
light blue violet. |
Pleochroism (z): |
blue violet. |
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Calculated Properties of Winchite
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Electron Density: |
relectron=3.01 gm/cc note: rWinchite =3.02 gm/cc. |
Fermion Index |
Fermion Index = 0.02594 Boson Index = 0.97406 |
Photoelectric: |
PEWinchite = 3.39 barns/electron U=PEWinchite x relectron= 10.18 barns/cc. |
Radioactivity: |
GRapi = 6.78 (Gamma Ray American Petroleum Institute Units)
Estimated Radioactivity from Winchite - barely detectable
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Winchite Classification
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Dana Class: |
66.1.3b.1 (66)Inosilicate Double-Width Unbranched Chains, W=2 |
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(66.1)Dana Type |
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(66.1.3b)Group 3, the sodic-calcic amphiboles |
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66.1.3b.1 Winchite [](CaNa)Mg4(Al,Fe3)Si8O22(OH)2 C 2/m 2/m |
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66.1.3b.1a Parvowinchite Na(NaMn)(Mg4Fe)Si8O22(OH)2 C 2/m 2/m |
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66.1.3b.2 Ferrowinchite [](CaNa)Fe4(Al,Fe)Si8O22(OH)2 C 2/m 2/m |
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66.1.3b.3 Ferriwinchite NaCaMg4FeSi8O22(OH)2 C 2/m 2/m |
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66.1.3b.4 Ferroferriwinchite* CaNa(Fe,Mg)4Fe[Si8O22](OH)2 C 2/m 2/m |
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66.1.3b.5 Barroisite [](CaNa)Mg3AlFeSi7AlO22(OH)2 C 2/m 2/m |
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66.1.3b.5a Aluminobarroisite! []CaNaMg3Al2(Si7Al)O22(OH)2 C 2/m 2/m |
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66.1.3b.6 Ferrobarroisite [](CaNa)Fe3AlFeSi7AlO22(OH)2 C 2/m 2/m |
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66.1.3b.6a Aluminoferrobarroisite! []CaNa(Fe2)3Al2(Si7Al)O22(OH)2 C 2/m 2/m |
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66.1.3b.7 Ferribarroisite CaNa(Fe,Mg)3Fe2[AlSi7O22](OH)2 C 2/m 2/m |
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66.1.3b.8 Ferroferribarroisite* CaNa(Fe,Mg)3Fe2[AlSi7O22](OH)2 C 2/m 2/m |
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66.1.3b.8a Ferri-ferrobarroisite! []CaNa(Fe)3(Fe)2(Si7Al)O22(OH)2 C 2/m 2/m |
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66.1.3b.9 Richterite Na(CaNa)(Mg,Fe)5[Si8O22](OH)2 C 2/m 2/m |
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66.1.3b.9a Fluororichterite! Na(CaNa)Mg5[Si8O22]F2 C 2/m 2/m |
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66.1.3b.9b Potassic-fluororichterite! (K,Na)(CaNa)Mg5[Si8O22]F2 C 2/m 2/m |
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66.1.3b.9c Potassicrichterite! (K,Na)(CaNa)2Mg5[Si8O22](OH,F)2 C 2/m 2/m |
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66.1.3b.10 Ferrorichterite Na(CaNa)Fe5[Si8O22](OH)2 C 2/m 2/m |
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66.1.3b.11 Magnesiokatophorite Na(CaNa)Mg4AlSi7AlO22(OH)2 C 2/m 2/m |
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66.1.3b.12 Katophorite Na(CaNa)Fe4(Al,Fe)Si7AlO22(OH)2 C 2/m 2/m |
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66.1.3b.13 Magnesioferrikatophorite Na2Ca(Mg,Fe)4FeSi7AlO22(OH)2 C 2/m 2/m |
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66.1.3b.14 Ferrikatophorite Na2Ca(Fe,Mg)4Fe(Si7Al)O22(OH)2 C 2/m 2/m |
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66.1.3b.15 Magnesiotaramite Na(CaNa)Mg3ALFe[Si6Al2O22](OH)2 C 2/m 2/m |
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66.1.3b.15a Aluminomagnesiotaramite! NaCaNaMg3Al2[Si6Al2O22](OH)2 C 2/m 2/m |
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66.1.3b.16 Taramite Na(CaNa)Fe3AlFe[Si6Al2O22](OH)2 C 2/m 2/m |
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66.1.3b.17 Ferri-magnesiotaramite! NaCaNaMg3Fe2[Si6Al2O22](OH)2 C 2/m 2/m |
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66.1.3b.18 Ferritaramite Na(CaNa)(Fe,Mg)3Fe2[Si6Al2O22](OH)2 C 2/m 2/m |
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66.1.3b.19 IMA2003-050! NaCa2(Mg3FeAl)5(Si6Al2O22)F2 C 2/m 2/m |
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66.1.3b.20 IMA2003-062! Na(CaMn)2Mg5(Si7Al)O22(OH)2 C 2/m 2/m |
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66.1.3b.21 IMA2004-045! [](CaMn)S2Mg5Si8O22(OH)2 C 2/m 2/m |
Strunz Class: |
VIII/F.09-90 VIII - Silicates |
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VIII/F - Inosilicates (chain and band) double chains [Si4O11]6-, Na-Ca-Amphiboles |
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VIII/F.09 - Amphibole group, Richterite - Ferrobarroisite series |
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VIII/F.09-10 Richterite Na(CaNa)(Mg,Fe)5[Si8O22](OH)2 C 2/m 2/m |
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VIII/F.09-12 Fluororichterite! Na(CaNa)Mg5[Si8O22]F2 C 2/m 2/m |
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VIII/F.09-14 Potassicrichterite! (K,Na)(CaNa)2Mg5[Si8O22](OH,F)2 C 2/m 2/m |
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VIII/F.09-16 Potassic-fluororichterite! (K,Na)(CaNa)Mg5[Si8O22]F2 C 2/m 2/m |
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VIII/F.09-20 Ferrorichterite Na(CaNa)Fe5[Si8O22](OH)2 C 2/m 2/m |
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VIII/F.09-30 Magnesiokatophorite Na(CaNa)Mg4AlSi7AlO22(OH)2 C 2/m 2/m |
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VIII/F.09-40 Magnesioferrikatophorite Na2Ca(Mg,Fe)4FeSi7AlO22(OH)2 C 2/m 2/m |
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VIII/F.09-50 Katophorite Na(CaNa)Fe4(Al,Fe)Si7AlO22(OH)2 C 2/m 2/m |
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VIII/F.09-60 Ferrikatophorite Na2Ca(Fe,Mg)4Fe(Si7Al)O22(OH)2 C 2/m 2/m |
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VIII/F.09-65 Aluminomagnesiotaramite! NaCaNaMg3Al2[Si6Al2O22](OH)2 C 2/m 2/m |
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VIII/F.09-70 Magnesiotaramite Na(CaNa)Mg3ALFe[Si6Al2O22](OH)2 C 2/m 2/m |
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VIII/F.09-75 Ferri-magnesiotaramite! NaCaNaMg3Fe2[Si6Al2O22](OH)2 C 2/m 2/m |
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VIII/F.09-80 Taramite Na(CaNa)Fe3AlFe[Si6Al2O22](OH)2 C 2/m 2/m |
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VIII/F.09-81 Ferritaramite Na(CaNa)(Fe,Mg)3Fe2[Si6Al2O22](OH)2 C 2/m 2/m |
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VIII/F.09-85 Parvowinchite Na(NaMn)(Mg4Fe)Si8O22(OH)2 C 2/m 2/m |
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VIII/F.09-90 Winchite [](CaNa)Mg4(Al,Fe3)Si8O22(OH)2 C 2/m 2/m |
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VIII/F.09-100 Ferrowinchite [](CaNa)Fe4(Al,Fe)Si8O22(OH)2 C 2/m 2/m |
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VIII/F.09-105 Ferriwinchite NaCaMg4FeSi8O22(OH)2 C 2/m 2/m |
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VIII/F.09-107 Aluminobarroisite! []CaNaMg3Al2(Si7Al)O22(OH)2 C 2/m 2/m |
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VIII/F.09-108 Aluminoferrobarroisite! []CaNa(Fe2)3Al2(Si7Al)O22(OH)2 C 2/m 2/m |
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VIII/F.09-110 Barroisite [](CaNa)Mg3AlFeSi7AlO22(OH)2 C 2/m 2/m |
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VIII/F.09-120 Ferrobarroisite [](CaNa)Fe3AlFeSi7AlO22(OH)2 C 2/m 2/m |
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VIII/F.09-125 Ferribarroisite CaNa(Fe,Mg)3Fe2[AlSi7O22](OH)2 C 2/m 2/m |
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VIII/F.09-126 Ferri-ferrobarroisite! []CaNa(Fe)3(Fe)2(Si7Al)O22(OH)2 C 2/m 2/m |
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Other Winchite Information
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References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic2) |
See Also: |
Links to other databases for Winchite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - Crocoite.com Mineral Locations
4 - EUROmin Project
5 -Google Images
6 -Google Scholar
7 -Handbook of Mineralogy (MinSocAm)
8 -Handbook of Mineralogy (UofA)
9 -MinDAT
10 -MinMax(Deutsch)
11 -MinMax(English)
12 -Mineralienatlas (Deutsch)
13 -QUT Mineral Atlas
14 - WWW-MINCRYST
15 -École des Mines de Paris
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Winchite
[ ](CaNa)Mg4(Al,Fe3+)Si8O22(OH)2
Dana No: 66.1.3b.1 Strunz No: VIII/F.09-90
Locality:
Notes:
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