Mineralogy Database

Yofortierite Mineral Data

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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´┐Ż9(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
  Sepiolite - Mn bearing

Yofortierite Image

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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 - Domatic H-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 Diaphaneity: Diaphaneity: 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
Ncalc = 1.5 - 1.65
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: Bulk Density (Electron Density)=2.18 gm/cc
note: Specific Gravity of Yofortierite =2.18 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEYofortierite = 6.81 barns/electron
U=PEYofortierite x rElectron Density= 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: 74.03.01a.03 (74)Phyllosilicate Modulated Layers
  (74.03)with joined strips
  (74.03.01a)Palygorskite-sepiolite group (Palygorskite subgroup)
74.03.01a.01 Palygorskite (Mg,Al)2Si4O10(OH)•4(H2O) C 2/m 2/m
74.03.01a.02 Tuperssuatsiaite Na(Fe,Mn)3[Si8O20](OH)2•n(H2O) C 2/m Mono
74.03.01a.03 Yofortierite (Mn,Mg)5Si8O20(OH)2•8-9(H2O) Pn(?) m
74.03.01a.04 Kalifersite! (K,Na)5Fe7Si20O50(OH)6•12(H2O) P1 1
Help on  Strunz Class: Strunz Class: 09.EE.20 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EE -Single tetrahedral nets of 6-membered rings
09.EE.20 Palygorskite (Mg,Al)2Si4O10(OH)•4(H2O) C 2/m 2/m
09.EE.20 Yofortierite (Mn,Mg)5Si8O20(OH)2•8-9(H2O) Pn(?) m
09.EE.20 Tuperssuatsiaite Na(Fe,Mn)3[Si8O20](OH)2•n(H2O) C 2/m Mono

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 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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Dana No: 74.03.01a.03 Strunz No: 09.EE.20





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