Leucophanite Mineral Data

Leucophanite Mineral Data +

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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

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:

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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

Diaphaniety:

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.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Leucophanite

Gladstone-Dale:

CI meas= 0.112 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.081 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2056,KPDmeas= 0.1986,KC= 0.2237

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:

r_electron=2.84 gm/cc
note: r_Leucophanite=2.86 gm/cc.

Fermion Index

Fermion Index = 0.04964
Boson Index = 0.95036

Photoelectric:

PE_Leucophanite= 2.25 barns/electron
U=PE_Leucophanite x r_electron= 6.41 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Leucophanite is Not Radioactive

Leucophanite Classification

Dana Class:

55.4.2.4 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions

(55.4)with cations in [8] and lower coordination

(55.4.2)Fresnoite group

55.4.2.1 Fresnoite Ba2TiSi2O8 P 4bm 4mm

55.4.2.2 Hardystonite Ca2ZnSi2O7 P 42₁m 4 2m

55.4.2.3 Jeffreyite (Ca,Na)2(Be,Al)Si2(O,OH)7 C 222₁ 2 2 2

55.4.2.4 Leucophanite (Na,Ca)2BeSi2(O,OH,F)7 P1 1

55.4.2.5 Meliphanite (Ca,Na)2Be[(Si,Al)2O6(F,OH)] I 4 4

55.4.2.6 Gugiaite Ca2BeSi2O7 P 42₁m 4 2m

Strunz Class:

VIII/C.02-50 VIII - Silicates

VIII/C - Sorosilicates, with [Si2O7]6-, without anions unfamiliar to tetraheders

VIII/C.02 - Melilite group

VIII/C.02-10 Akermanite Ca2MgSi2O7 P 42₁m 4 2m

VIII/C.02-14 Okayamalite! Ca2B2SiO7 P 42₁m 4 2m

VIII/C.02-15 Gehlenite Ca2Al(AlSi)O7 P 42₁m 4 2m

VIII/C.02-30 Gugiaite Ca2BeSi2O7 P 42₁m 4 2m

VIII/C.02-40 Hardystonite Ca2ZnSi2O7 P 42₁m 4 2m

VIII/C.02-50 Leucophanite (Na,Ca)2BeSi2(O,OH,F)7 P1 1

VIII/C.02-60 Jeffreyite (Ca,Na)2(Be,Al)Si2(O,OH)7 C 222₁ 2 2 2

VIII/C.02-70 Meliphanite (Ca,Na)2Be[(Si,Al)2O6(F,OH)] I 4 4

VIII/C.02-80 Barylite BaBe2Si2O7 Pn21a mm2

VIII/C.02-85 Clinobarylite! BaBe2Si2O7 Pmn2 2/m 2/m 2/m

VIII/C.02-90 Andremeyerite BaFe(Fe,Mn,Mg)Si2O7 P 2₁/c 2/m

Other Leucophanite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Leucophanite

(Na,Ca)2BeSi2(O,OH,F)7
Dana No: 55.4.2.4 Strunz No: VIII/C.02-50
Locality:

Notes: