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Leucophanite Mineral Data
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General Leucophanite Information
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 Chemical Formula: |
(Na,Ca)2BeSi2(O,OH,F)7 |
| Composition: |
Molecular Weight = 235.92 gm |
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Sodium 14.62 % Na 19.70 % Na2O |
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Calcium 8.49 % Ca 11.88 % CaO |
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Beryllium 3.82 % Be 10.60 % BeO |
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Silicon 23.81 % Si 50.94 % SiO2 |
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Hydrogen 0.90 % H 8.02 % H2O |
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Oxygen 42.72 % O |
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Fluorine 5.64 % F 5.64 % F |
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- %
F -2.37 % -O=F2 |
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______ ______ |
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100.00 % 104.41 % = TOTAL OXIDE |
| Empirical Formula: |
Na1.5Ca0.5BeSi2O4.2(OH)2.1F0.7 |
| 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  |
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Leucophanite Image |
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Images:
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Leucophanite Crystallography
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| 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 - Pedial H-M Symbol (1) Space Group: P1 |
| X Ray Diffraction: |
By Intensity(I/Io): 2.75(1), 2.97(0.5), 3.6(0.5), |
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Physical Properties of Leucophanite
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| 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 |
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Optical Properties of Leucophanite
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| Optical Data: |
Biaxial (-), a=1.571, b=1.595, g=1.598, bire=0.0270 |
| Pleochroism (x): |
colorless. |
| Pleochroism (y): |
colorless. |
| Pleochroism (z): |
colorless. |
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Calculated Properties of Leucophanite
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| Electron Density: |
Bulk Density (Electron Density)=2.84 gm/cc
note: Specific Gravity of Leucophanite =2.86 gm/cc.
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| Fermion Index: |
Fermion Index = 0.04
Boson Index = 0.96 |
| Photoelectric: |
PELeucophanite = 2.25 barns/electron
U=PELeucophanite x rElectron Density= 6.41 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Leucophanite is Not Radioactive |
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Leucophanite Classification
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| Dana Class: |
55.04.02.04 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions |
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(55.04)with cations in [8] and lower coordination |
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(55.04.02)Fresnoite group |
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55.04.02.01 Fresnoite Ba2TiSi2O8 P 4bm 4mm |
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55.04.02.02 Hardystonite Ca2ZnSi2O7 P 421m 4 2m |
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55.04.02.03 Jeffreyite (Ca,Na)2(Be,Al)Si2(O,OH)7 C 2221 2 2 2 |
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55.04.02.04 Leucophanite (Na,Ca)2BeSi2(O,OH,F)7 P1 1 |
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55.04.02.05 Meliphanite (Ca,Na)2Be[(Si,Al)2O6(F,OH)] I 4 4 |
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55.04.02.06 Gugiaite Ca2BeSi2O7 P 421m 4 2m |
| Strunz Class: |
09.DH.05 09 - SILICATES (Germanates) |
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09.D - Inosilicates* Structural terminology according to Liebau (1985) |
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09.DH -Inosilicates with 4-periodic single chains, Si4O12 |
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09.DH.05 Leucophanite (Na,Ca)2BeSi2(O,OH,F)7 P1 1 |
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Other Leucophanite Information
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| 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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Print or Cut-and-Paste your Leucophanite Specimen Label here :
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Leucophanite
(Na,Ca)2BeSi2(O,OH,F)7
Dana No: 55.04.02.04 Strunz No: 09.DH.05
Locality:
Notes:
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