Parafransoletite Mineral Data

Parafransoletite Mineral Data +

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General Parafransoletite Information

Chemical Formula:

Ca3Be2(PO4)2(PO3,OH)2·4(H2O)

Composition:

Molecular Weight = 527.22 gm

Calcium 22.81 % Ca 31.91 % CaO

Beryllium 3.42 % Be 9.49 % BeO

Phosphorus 20.56 % P 47.12 % P₂O₅

Hydrogen 1.63 % H 14.52 % H₂O

Oxygen 51.59 % O

______ ______

100.00 % 103.03 % = TOTAL OXIDE

Empirical Formula:

Ca₃Be₂(PO₄)₂(PO₃)_1.5(OH)_0.5·4(H₂O)

Environment:

Secondary phosphate mineral in a pegmatite.

IMA Status:

Approved IMA 1990

Locality:

Tip Top Pegmatite, Black Hills, Custer County, South Dakota, USA. Link to MinDat.org Location Data.

Name Origin:

Named for it's dimorphous relatinship with fransoltite.

Synonym:

ICSD 40671

IMA1989-049

PDF 47-1830

Parafransoletite Image

Images:

Click Here for Larger Parafransoletite Image

Parafransoletite Roscherite

Comments: White, crystalline aggregate sprays of parafransoletite on dark reddish brown roscherite with massive, white, sucrosic whitlockite.
Location: Tip Top mine, Custer County, South Dakota, USA. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

Parafransoletite Crystallography

Axial Ratios:

a:b:c =0.952:1:0.9174

Cell Dimensions:

a = 7.327, b = 7.696, c = 7.061, Z = 1; alpha = 94.903°, beta = 96.82°, gamma = 101.865° V = 385.48 Den(Calc)= 2.27

Crystal System:

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

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

By Intensity(I/I_o): 3.032(1), 3.619(0.8), 2.595(0.6),

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 Parafransoletite

Cleavage:

None

Color:

Colorless, White.

Density:

2.54

Diaphaniety:

Transparent to Translucent

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Habit:

Spear Head - Crystals are long, pointed and shaped like spearheads.

Habit:

Wheat Sheaf - Bundle shaped aggregates resembling wheat sheafs after hand reaping wheat.

Hardness:

2.5 - Finger Nail

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Silky

Streak:

white

Optical Properties of Parafransoletite

Gladstone-Dale:

CI meas= 0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.117 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2517,KPDmeas= 0.2249,KC= 0.2254

Optical Data:

Biaxial (+), a=1.562, b=1.564, g=1.588, bire=0.0260, 2V(Calc)=34, 2V(Meas)=33.

Calculated Properties of Parafransoletite

Electron Density:

r_electron=2.55 gm/cc
note: r_{Parafransoletite}=2.54 gm/cc.

Fermion Index

Fermion Index = 0.03474
Boson Index = 0.96526

Photoelectric:

PE_{Parafransoletite}= 3.81 barns/electron
U=PE_{Parafransoletite} x r_electron= 9.73 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Parafransoletite is Not Radioactive

Parafransoletite Classification

Dana Class:

40.5.2.1 (40)Hydrated Phosphates, etc

(40.5)with miscellaneous formulae

(40.5.2)Dana Group

40.5.2.1 Parafransoletite Ca3Be2(PO4)2(PO3,OH)2·4(H2O) P1 1

Strunz Class:

VII/C.03-15 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 Parafransoletite Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.77,p843-847,1992) OPTIC PROP.(Am.Min.,Vol.77,p843-847,1992)

See Also:

Links to other databases for Parafransoletite :
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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Parafransoletite

Ca3Be2(PO4)2(PO3,OH)2·4(H2O)
Dana No: 40.5.2.1 Strunz No: VII/C.03-15
Locality:

Notes: