Fransoletite Mineral Data

Fransoletite Mineral Data +

General Fransoletite Information

Chemical Formula:

H2Ca3Be2(PO4)4·4(H2O)

Composition:

Molecular Weight = 592.22 gm

Calcium 20.30 % Ca 28.41 % CaO

Beryllium 3.04 % Be 8.45 % BeO

Phosphorus 20.92 % P 47.94 % P₂O₅

Hydrogen 1.70 % H 15.21 % H₂O

Oxygen 54.03 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

H₂Ca₃Be₂(PO₄)₄·4(H₂O)

IMA Status:

Approved IMA 1983

Locality:

Tip Top pegmatite, Custer, Custer County, South Dakota, USA Link to MinDat.org Location Data.

Name Origin:

Named for A.M. Fransolet

Synonym:

ICSD 40670

PDF 35-629

Fransoletite Image

Images:

Fransoletite

Comments: Light blue crystals of fransoletite.
Location: Tip Top mine, Custer, Custer County, South Dakota, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Fransoletite Crystallography

Axial Ratios:

a:b:c =0.4881:1:0.4695

Cell Dimensions:

a = 7.348, b = 15.052, c = 7.068, Z = 2; beta = 96.519° V = 776.68 Den(Calc)= 2.53

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

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

By Intensity(I/I_o): 3.044(1), 3.47(0.9), 3.32(0.7),

Crystal Structure:

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Kampf A R , American Mineralogist , 77 (1992) p.848-856, Beryllophosphate chains in the structures of fransoletite, parafransoletite, and, ehrleite and some general comments on beryllophosphate linkages

Physical Properties of Fransoletite

Cleavage:

[010] Indistinct

Color:

Colorless, White.

Density:

2.56

Diaphaniety:

Transparent to Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Fransoletite

Gladstone-Dale:

CI meas= -0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.028 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2256,KPDmeas= 0.2229,KC= 0.2194

Optical Data:

Biaxial (+), a=1.56, b=1.566, g=1.586, bire=0.0260, 2V(Calc)=58, 2V(Meas)=25.

Calculated Properties of Fransoletite

Electron Density:

r_electron=2.58 gm/cc
note: r_Fransoletite=2.56 gm/cc.

Fermion Index

Fermion Index = 0.03097
Boson Index = 0.96903

Photoelectric:

PE_Fransoletite= 3.53 barns/electron
U=PE_Fransoletite x r_electron= 9.10 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Fransoletite is Not Radioactive

Fransoletite Classification

Dana Class:

40.5.1.1 (40)Hydrated Phosphates, etc

(40.5)with miscellaneous formulae

(40.5.1)Dana Group

40.5.1.1 Fransoletite H2Ca3Be2(PO4)4·4(H2O) P 2₁/a 2/m

Strunz Class:

VII/C.03-10 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg

VII/C.03 - Fransoletite - Ehrleite series

VII/C.03-10 Fransoletite H2Ca3Be2(PO4)4·4(H2O) P 2₁/a 2/m

VII/C.03-15 Parafransoletite Ca3Be2(PO4)2(PO3,OH)2·4(H2O) P1 1

VII/C.03-20 Ehrleite Ca2ZnBe(PO4)2(PO3,OH)·4(H2O) P1 1

Other Fransoletite Information

References:

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

See Also:

Links to other databases for Fransoletite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Fransoletite

H2Ca3Be2(PO4)4·4(H2O)
Dana No: 40.5.1.1 Strunz No: VII/C.03-10
Locality:

Notes: