Leucophanite Mineral Data

Leucophanite Mineral Data
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General Leucophanite Information

Help on Chemical Formula: Chemical Formula: (Na,Ca)2BeSi2(O,OH,F)7
Help on Composition: Composition: Molecular Weight = 235.92 gm
   Sodium     14.62 %  Na   19.70 % Na2O
   Calcium     8.49 %  Ca   11.88 % CaO
   Beryllium   3.82 %  Be   10.60 % BeO
   Silicon    23.81 %  Si   50.94 % SiO2
   Hydrogen    0.90 %  H     8.02 % H2O
   Oxygen     42.72 %  O
   Fluorine    5.64 %  F     5.64 % F
                -   %   F    -2.37 % -O=F2    
             ______        ______ 
             100.00 %      104.41 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na1.5Ca0.5BeSi2O4.2(OH)2.1F0.7
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1840
Help on Locality: Locality: Langesundfiord district, southern Norway. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek leucos, "white" and phanein, " to appear" in allusion to the white color
Help on Name Pronunciation: Name Pronunciation: Leucophanite Say LEUCOPHANITE
 

Leucophanite Image

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Leucophanite

Comments: Pseudo-cubic crystals of leucophanite.
Location: Mont St. Hilaire, Quebec, Canada. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Leucophanite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =1.0025:1:1.3498
Help on Cell Dimensions: Cell Dimensions: a = 7.417, b = 7.398, c = 9.986, Z = 4; alpha = 90°, beta = 90°, gamma = 90° V = 547.94 Den(Calc)= 2.86
Help on Crystal System: Crystal System: Triclinic - PedialH-M Symbol (1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.75(1), 2.97(0.5), 3.6(0.5),
Click Here for Large Leucophanite Structure Window Crystal Structure:

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Grice J D , Hawthorne F C , The Canadian Mineralogist , 27 (1989) p.193-197, Refinement of the crystal structure of leucophanite

 

Physical Properties of Leucophanite

Help on Cleavage: Cleavage: {???} Good, {???} Good, {???} Distinct
Help on Color: Color: White, Greenish yellow, Yellow, Light green.
Help on Density: Density: 2.96
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 4 - Fluorite
Help on Luminescence: Luminescence: Fluorescent, Short UV=pink, Long UV=pink.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Leucophanite

Help on Optical Data: Optical Data: Biaxial (-), a=1.571, b=1.595, g=1.598, bire=0.0270
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.
 

Calculated Properties of Leucophanite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.84 gm/cc
note: Specific Gravity of Leucophanite =2.86 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PELeucophanite = 2.25 barns/electron
U=PELeucophanite x rElectron Density= 6.41 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Leucophanite is Not Radioactive
 

Leucophanite Classification
Help on Dana Class: Dana Class: 55.04.02.04 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions
  (55.04)with cations in [8] and lower coordination
  (55.04.02)Fresnoite group
 
55.04.02.01 Fresnoite Ba2TiSi2O8 P 4bm 4mm
 
55.04.02.02 Hardystonite Ca2ZnSi2O7 P 421m 4 2m
 
55.04.02.03 Jeffreyite (Ca,Na)2(Be,Al)Si2(O,OH)7 C 2221 2 2 2
 
55.04.02.04 Leucophanite (Na,Ca)2BeSi2(O,OH,F)7 P1 1
 
55.04.02.05 Meliphanite (Ca,Na)2Be[(Si,Al)2O6(F,OH)] I 4 4
 
55.04.02.06 Gugiaite Ca2BeSi2O7 P 421m 4 2m
Help on Strunz Class: Strunz Class: 09.DH.05 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DH -Inosilicates with 4-periodic single chains, Si4O12
 
09.DH.05 Leucophanite (Na,Ca)2BeSi2(O,OH,F)7 P1 1
 

Other Leucophanite Information
Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990;www.saint-hilaire.ca) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Leucophanite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - EUROmin Project
7 - Ecole des Mines de Paris
8 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - WWW-MINCRYST

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Print or Cut-and-Paste your Leucophanite Specimen Label here :

Leucophanite

(Na,Ca)2BeSi2(O,OH,F)7
Dana No: 55.04.02.04 Strunz No: 09.DH.05
Locality:

 

Notes: