Yofortierite Mineral Data (original) (raw)

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

Mn-palygorskite

Sepiolite - Mn bearing

Yofortierite Image

Click Here for Larger Yofortierite Image in a New Browser Window Images:

Click Here for Larger Yofortierite Image 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 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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Print or Cut-and-Paste your Yofortierite Specimen Label here :

Yofortierite

(Mn,Mg)5Si8O20(OH)2•8-9(H2O)
Dana No: 74.03.01a.03 Strunz No: 09.EE.20
Locality:

Notes: