Leucophanite Mineral Data

General Leucophanite Information

Chemical Formula:

(Na,Ca)2BeSi2(O,OH,F)7

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

Empirical Formula:

Na_1.5Ca_0.5BeSi₂O_4.2(OH)_2.1F_0.7

IMA Status:

Valid Species (Pre-IMA) 1840

Locality:

Langesundfiord district, southern Norway. Link to MinDat.org Location Data.

Name Origin:

From the Greek leucos, "white" and phanein, " to appear" in allusion to the white color

Name Pronunciation:

Leucophanite

Leucophanite Image

Images:

Leucophanite

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

Leucophanite Crystallography

Axial Ratios:

a:b:c =1.0025:1:1.3498

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

Crystal System:

Triclinic - PedialH-M Symbol (1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.75(1), 2.97(0.5), 3.6(0.5),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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H - Help Screen
I - Data Info
A - Atoms On/Off
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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

Cleavage:

{???} Good, {???} Good, {???} Distinct

Color:

White, Greenish yellow, Yellow, Light green.

Density:

2.96

Diaphaneity:

Transparent to translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

4 - Fluorite

Luminescence:

Fluorescent, Short UV=pink, Long UV=pink.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Leucophanite

Optical Data:

Biaxial (-), a=1.571, b=1.595, g=1.598, bire=0.0270

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Leucophanite

Electron Density:

Bulk Density (Electron Density)=2.84 gm/cc
note: Specific Gravity of Leucophanite =2.86 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Leucophanite= 2.25 barns/electron
U=PE_Leucophanite x rElectron Density= 6.41 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Leucophanite is Not Radioactive

Leucophanite Classification

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

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

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990;www.saint-hilaire.ca) OPTIC PROP.(Ford32)

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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Ask about Leucophanite here :
Ask-A-Mineralogist from the Mineralogical Society of America
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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: