Fillowite Mineral Data

Fillowite Mineral Data +

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General Fillowite Information

Chemical Formula:

Na2Ca(Mn,Fe++)7(PO4)6

Composition:

Molecular Weight = 1,042.27 gm

Sodium 4.41 % Na 5.95 % Na₂O

Calcium 3.85 % Ca 5.38 % CaO

Manganese 26.36 % Mn 34.03 % MnO

Iron 10.72 % Fe 13.79 % FeO

Phosphorus 17.83 % P 40.86 % P₂O₅

Oxygen 36.84 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂CaMn²⁺₅Fe²⁺₂(PO₄)₆

Environment:

Accessory mineral in a zoned granite pegmatite.

IMA Status:

Valid Species (Pre-IMA) 1879

Locality:

Branchville, Fairfield County, Connecticut, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Abijah N. Fillow (1822-1895), of Branchville, Connecticut, who supplied minerals from his quarry at the locality.

Synonym:

ICSD 100869

PDF 18-516

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Fillowite Crystallography

Axial Ratios:

a:c = 1:2.84694

Cell Dimensions:

a = 15.282, c = 43.507, Z = 18; V = 8,799.34 Den(Calc)= 3.54

Crystal System:

Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3

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

By Intensity(I/I_o): 2.814(1), 3.017(0.7), 3.64(0.65),

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Crystal Structure:

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Araki T , Moore P B , American Mineralogist , 66 (1981) p.827-842, Fillowite, Na2Ca(Mn,Fe)7(PO4)6: Its crystal structure

Physical Properties of Fillowite

Cleavage:

[001] Perfect

Color:

Yellow, Reddish brown, Colorless.

Density:

3.43

Diaphaniety:

Transparent to translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

4.5 - Between Fluorite and Apatite

Luminescence:

Non-fluorescent.

Luster:

Resinous - Greasy

Streak:

white

Optical Properties of Fillowite

Gladstone-Dale:

CI meas= -0.03 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1899,KPDmeas= 0.196,KC= 0.1903

Optical Data:

Uniaxial (+), w=1.671, e=1.676, bire=0.0010.

Calculated Properties of Fillowite

Electron Density:

r_electron=3.40 gm/cc
note: r_Fillowite=3.54 gm/cc.

Fermion Index

Fermion Index = 0.0025
Boson Index = 0.9975

Photoelectric:

PE_Fillowite= 11.43 barns/electron
U=PE_Fillowite x r_electron= 38.89 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Fillowite is Not Radioactive

Fillowite Classification

Dana Class:

38.2.5.1 (38)Anhydrous Phosphates, etc

(38.2)(A+ B++)5 (XO4)3

(38.2.5)Dana Group

38.2.5.1 Fillowite Na2Ca(Mn,Fe)7(PO4)6 R 3 3

38.2.5.2 Johnsomervilleite Na2Ca(Mg,Fe,Mn)7(PO4)6 R 3 3

38.2.5.3 Chladniite Na2Ca(Mg,Fe)7(PO4)6 R 3 3

38.2.5.4 Galileiite! NaFe4(PO4)3 R 3 3

Strunz Class:

VII/A.08-20 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, cations of medium and big size: Mg, Mn,Fe, Cu, Zn, and Ca, Na

VII/A.08 - Chladniite - Berzeliite - Palenzonaite series

VII/A.08-03 Galileiite! NaFe4(PO4)3 R 3 3

VII/A.08-05 Chladniite Na2Ca(Mg,Fe)7(PO4)6 R 3 3

VII/A.08-10 Johnsomervilleite Na2Ca(Mg,Fe,Mn)7(PO4)6 R 3 3

VII/A.08-20 Fillowite Na2Ca(Mn,Fe)7(PO4)6 R 3 3

VII/A.08-30 Berzeliite (Ca,Na)3(Mg,Mn)2(AsO4)3 I a3d 4/m 3 2/m

VII/A.08-40 Manganberzeliite (Ca,Na)3(Mn,Mg)2(AsO4)3 I a3d 4/m 3 2/m

VII/A.08-45 Schaferite! NaCa2Mg2(VO4)3 I a3d 4/m 3 2/m

VII/A.08-50 Palenzonaite (Ca,Na)3Mn(V,As,Si)3O12 I a3d 4/m 3 2/m

Other Fillowite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Fillowite :
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 - Minerals of Wisconsin 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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

Fillowite

Na2Ca(Mn,Fe++)7(PO4)6
Dana No: 38.2.5.1 Strunz No: VII/A.08-20
Locality:

Notes: