Yofortierite Mineral Data

General Yofortierite Information

Help on Chemical  Formula: Chemical Formula: (Mn,Mg)5Si8O20(OH)2·8-9(H2O)
Help on Composition: Composition: Molecular Weight = 1,002.61 gm
   Calcium     0.80 %  Ca    1.12 % CaO
   Magnesium   1.45 %  Mg    2.41 % MgO
   Manganese  21.92 %  Mn   28.30 % MnO
   Aluminum    0.81 %  Al    1.53 % Al2O3
   Zinc        0.65 %  Zn    0.81 % ZnO
   Silicon    22.41 %  Si   47.94 % SiO2
   Hydrogen    2.01 %  H    17.97 % H2O
   Oxygen     49.95 %  O
             ______        ______ 
             100.00 %      100.08 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+4Mg0.6Al0.3Ca0.2Zn0.1Si8O20.3(OH)2·9(H2O)
Help on Environment: Environment: Late stage hydrothermal mineral in pegmatite veins within nepheline syenite.
Help on IMA Status: IMA Status: Approved IMA 1975
Help on Locality: Locality: Mont Saint-Hilaire, Quebec, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Yves Oscar Fortier (1914-), formater Director of the Geological Survey of Canada (1964-1972).
Help on Synonym: Synonym: IMA1974-045
 

Yofortierite Image

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Yofortierite

Comments: Radial spray of yofortierite in matrix.
Location: Mt. St. Hilaire, Quebec, Canada. Scale: Picture size 1.5 cm.
© John Veevaert

Yofortierite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6945:1:0.2735
Help on Cell Dimensions: Cell Dimensions: a = 12.759, b = 18.369, c = 5.024, Z = 2; beta = 94.98° V = 1,173.03 Den(Calc)= 2.84
Help on Crystal System: Crystal System: Monoclinic - DomaticH-M Symbol (m) Space Group: Pn(?)
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 10.5(1), 3.302(0.9), 2.621(0.3),
 

Physical Properties of Yofortierite

Help on Color: Color: Violet brown, Light violet, Pink.
Help on Density: Density: 2.18
Help on Diaphaniety: Diaphaniety: Transparent
Help on Fracture: Fracture: Elastic - Fragments which spring back after bending.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Streak: Streak: light pink
 

Optical Properties of Yofortierite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.095 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.16 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1917,KPDmeas= 0.2498,KC= 0.2282
Help on Optical Data: Optical Data: Biaxial (?), a=1.53, g=1.559, bire=0.0290
Help on Pleochroism (x): Pleochroism (x): distinct.
Help on Pleochroism (y): Pleochroism (y): distinct.
Help on Pleochroism (z): Pleochroism (z): distinct.
 

Calculated Properties of Yofortierite

Help on Electron Density: Electron Density:

relectron=2.18 gm/cc
note: rYofortierite =2.18 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.01244
Boson Index = 0.98756
Help on Photoelectric: Photoelectric:

PEYofortierite = 6.81 barns/electron
U=PEYofortierite x relectron= 14.82 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Yofortierite is Not Radioactive

 

Yofortierite Classification

Help on  Dana Class: Dana Class: 74.3.1a.3 (74)Phyllosilicate Modulated Layers
  (74.3)with joined strips
  (74.3.1a)Palygorskite-sepiolite group (Palygorskite subgroup)
 
74.3.1a.1 Palygorskite (Mg,Al)2Si4O10(OH)·4(H2O) C 2/m 2/m
 
74.3.1a.2 Tuperssuatsiaite Na(Fe,Mn)3[Si8O20](OH)2·n(H2O) C 2/m Mono
 
74.3.1a.3 Yofortierite (Mn,Mg)5Si8O20(OH)2·8-9(H2O) Pn(?) m
 
74.3.1a.4 Kalifersite! (K,Na)5Fe7Si20O50(OH)6·12(H2O) P1 1
Help on  Strunz Class: Strunz Class: VIII/H.33-30 VIII - Silicates
  VIII/H - Phyllosilicates (layered) Mica minerals with other simple layers, [Si6O15]6- and others
  VIII/H.33 - Tuperssuatsiaite - Loughlinite series
 
VIII/H.33-10 Tuperssuatsiaite Na(Fe,Mn)3[Si8O20](OH)2·n(H2O) C 2/m Mono
 
VIII/H.33-20 Palygorskite (Mg,Al)2Si4O10(OH)·4(H2O) C 2/m 2/m
 
VIII/H.33-30 Yofortierite (Mn,Mg)5Si8O20(OH)2·8-9(H2O) Pn(?) m
 
VIII/H.33-40 Sepiolite Mg4Si6O15(OH)2·6(H2O) Pnan 2/m 2/m 2/m
 
VIII/H.33-50 Falcondoite (Ni,Mg)4Si6O15(OH)2·6(H2O) Pncn 2/m 2/m 2/m
 
VIII/H.33-60 Loughlinite Na2Mg3Si6O16·8(H2O) Unk Ortho
 
VIII/H.33-80 Intersilite! Na6MnTi[Si10O24(OH)](OH)3·4(H2O) I2/m 2/m
 
VIII/H.33-90 Kalifersite! (K,Na)5Fe7Si20O50(OH)6·12(H2O) P1 1
 

Other Yofortierite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Yofortierite :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 - EUROmin Project 6 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (MinSocAm) 9 -Handbook of Mineralogy (UofA) 10 -MinDAT 11 -MinMax(Deutsch) 12 -MinMax(English) 13 -Mineralienatlas (Deutsch) 14 -QUT Mineral Atlas 15 -École des Mines de Paris

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Yofortierite

(Mn,Mg)5Si8O20(OH)2·8-9(H2O)
Dana No: 74.3.1a.3 Strunz No: VIII/H.33-30
Locality:

 

Notes:

 

 
   
 
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