Winchite Mineral Data

General Winchite Information

Chemical Formula: [ ](CaNa)Mg4(Al,Fe3+)Si8O22(OH)2 Composition: Molecular Weight = 828.18 gm    Potassium   0.47 %  K     0.57 % K₂O    Sodium      2.61 %  Na    3.52 % Na₂O    Calcium     6.15 %  Ca    8.60 % CaO    Magnesium  12.53 %  Mg   20.78 % MgO    Manganese   0.53 %  Mn    0.69 % MnO    Aluminum    1.01 %  Al    1.91 % Al₂O₃    Iron        3.71 %  Fe    5.30 % Fe₂O₃    Silicon    26.38 %  Si   56.44 % SiO₂    Hydrogen    0.24 %  H     2.18 % H₂O    Oxygen     46.36 %  O              ______        ______               100.00 %       99.98 % = TOTAL OXIDE Empirical Formula: Ca_1.27Na_0.94K_0.1Mg_4.27Fe³⁺_0.55Al_0.09Mn²⁺_0.08Si_7.78Al_0.22O₂₂(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. Name Pronunciation: Winchite Synonym: Aluminowinchite   PDF 20-1390  

Winchite Image

Images: Images:

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

Winchite Crystallography

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/I_o): 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]

 

Physical Properties of Winchite

Cleavage: {110} Perfect Color: Cobalt blue, Violet blue. Density: 2.96 Diaphaneity: Translucent Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments. Hardness: 5.5 - Knife Blade Luster: Vitreous (Glassy) Streak: pale bluish gray  

Optical Properties of Winchite

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
Ncalc = 1.63 - 1.65 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.  

Calculated Properties of Winchite

Electron Density: Bulk Density (Electron Density)=3.01 gm/cc
note: Specific Gravity of Winchite =3.02 gm/cc.
Fermion Index: Fermion Index = 0.02
Boson Index = 0.98 Photoelectric: PE_Winchite = 3.39 barns/electron
U=PE_Winchite x r_electron= 10.18 barns/cc.
Radioactivity:

GRapi = 6.78 (Gamma Ray American Petroleum Institute Units)
Concentration of Winchite per GRapi unit = 14.76 (%)

Estimated Radioactivity from Winchite - barely detectable

 

Winchite Classification

Dana Class: 66.01.03b.01 (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

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 Winchite Information

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 - 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
15 - WWW-MINCRYST
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