Fukalite Mineral Data

General Fukalite Information

Chemical Formula:

Ca4Si2O6(CO3)(OH,F)2

Composition:

Molecular Weight = 408.49 gm

Calcium 39.24 % Ca 54.91 % CaO

Silicon 13.75 % Si 29.42 % SiO₂

Hydrogen 0.25 % H 2.21 % H₂O

Carbon 2.94 % C 10.77 % CO₂

Oxygen 39.17 % O

Fluorine 4.65 % F 4.65 % F

- % F -1.96 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₄Si₂O₆(CO₃)(OH)F

Environment:

Alteration product of spurrite in spurrite-gehlenite skarns. Possible Order-Disorder structure tilleyite-type and tobermorite-type.

IMA Status:

Approved IMA 1977

Locality:

Bicchu, Fuka, Okayama Prefecture, Japan. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Fukalite

Fukalite Crystallography

Axial Ratios:

a:b:c =1.4497:1:6.1957

Cell Dimensions:

a = 5.48, b = 3.78, c = 23.42, Z = 2; V = 485.13 Den(Calc)= 2.80

Crystal System:

Orthorhombic Space Group: Bm21b, Bmmb, B2mb

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

By Intensity(I/I_o): 2.854(1), 3.084(0.9), 2.926(0.65),

Physical Properties of Fukalite

Color:

White, Light brown.

Density:

2.77

Diaphaneity:

Translucent

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Fukalite

Gladstone-Dale:

CI meas= -0.052 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.041 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2174,KPDmeas= 0.2197,KC= 0.2089
Ncalc = 1.58

Optical Data:

Biaxial (+/-), a=1.595, b=1.605, g=1.626, bire=0.0310, 2V(Calc)=70, 2V(Meas)=90.

Calculated Properties of Fukalite

Electron Density:

Bulk Density (Electron Density)=2.80 gm/cc
note: Specific Gravity of Fukalite =2.80 gm/cc.

Fermion Index:

Fermion Index = 0.007463203
Boson Index = 0.992536797

Photoelectric:

PE_Fukalite= 5.40 barns/electron
U=PE_Fukalite x rElectron Density= 15.10 barns/cc.

Radioactivity:

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

Fukalite Classification

Dana Class:

78.04.03.01 (78)Unclassified silicates

(78.04)possible inosilicates

(78.04.03)Dana Group

78.04.03.01 Fukalite Ca4Si2O6(CO3)(OH,F)2 Bm21b, Bmmb, B2mb Ortho

Strunz Class:

09.DQ.05 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DQ -Modular Inosilicate-Sorosilicate Structures

09.DQ.05 Fukalite Ca4Si2O6(CO3)(OH,F)2 Bm21b, Bmmb, B2mb Ortho

Other Fukalite Information

References:

NAME( Dana8, AmMin v94:323) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Fukalite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Fukalite

Ca4Si2O6(CO3)(OH,F)2
Dana No: 78.04.03.01 Strunz No: 09.DQ.05
Locality:

Notes:

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