Fillowite Mineral Data

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.

Name Pronunciation:

Fillowite + Pronunciation

Synonym:

ICSD 100869

PDF 18-516

Fillowite Image

Images:

Fillowite

Comments: Brown fillowite lining vugs in matrix.
Location: Sullivan Mine, Sullivan, New Hampshire. Scale: Specimen Size 4.8 x 3.9 x 1.5 cm.
© Rob Lavinsky

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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Forms: ( 1 0 1) ( 0 0 1)

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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

Diaphaneity:

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
Ncalc = 1.65 - 1.67

Optical Data:

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

Calculated Properties of Fillowite

Electron Density:

Bulk Density (Electron Density)=3.40 gm/cc
note: Specific Gravity of Fillowite =3.54 gm/cc.

Fermion Index:

Fermion Index = 0.0025006297
Boson Index = 0.9974993703

Photoelectric:

PE_Fillowite= 11.43 barns/electron
U=PE_Fillowite x rElectron Density= 38.89 barns/cc.

Radioactivity:

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

Fillowite Classification

Dana Class:

38.02.05.01 (38)Anhydrous Phosphates, etc

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

(38.02.05)Fillowite Group

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

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

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

38.02.05.04 Galileiite! NaFe4(PO4)3 R 3 3

38.02.05.05 Xenophyllite! Na4Fe7(PO4)6 P1 or P1 Tri

38.02.05.06 Stornesite-(Y)! (Y,Ca)[]2Na6(Ca,Na)8(Mg,Fe)43(PO4)36 R 3 3

Strunz Class:

08.AC.50 08 - PHOSPHATES, ARSENATES, VANADATES

08.A - Phosphates, etc. without additional anions, without H2O

08.AC -With medium-sized and large cations

08.AC.50 Fillowite Na2Ca(Mn,Fe)7(PO4)6 R 3 3

08.AC.50 Chladniite Na2Ca(Mg,Fe)7(PO4)6 R 3 3

08.AC.50 Johnsomervilleite Na2Ca(Mg,Fe,Mn)7(PO4)6 R 3 3

08.AC.50 Galileiite! NaFe4(PO4)3 R 3 3

08.AC.50 Stornesite-(Y)! (Y,Ca)[]2Na6(Ca,Na)8(Mg,Fe)43(PO4)36 R 3 3

08.AC.50 Xenophyllite! Na4Fe7(PO4)6 P1 or P1 Tri

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 - 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
15 - WWW-MINCRYST

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

Fillowite

Na2Ca(Mn,Fe++)7(PO4)6
Dana No: 38.02.05.01 Strunz No: 08.AC.50
Locality:

Notes: