Fluellite Mineral Data

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General Fluellite Information

Chemical Formula:

Al2(PO4)F2(OH)·7(H2O)

Composition:

Molecular Weight = 330.05 gm

Aluminum 16.35 % Al 30.89 % Al₂O₃

Phosphorus 9.38 % P 21.50 % P₂O₅

Hydrogen 4.58 % H 40.94 % H₂O

Oxygen 58.17 % O

Fluorine 11.51 % F 11.51 % F

- % F -4.85 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Al₂(PO₄)F₂(OH)·7(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1824

Locality:

Stennagwyn mine, St. Austell, Cornwall, England, UK. Link to MinDat.org Location Data.

Name Origin:

Named for the chemical compositon of fluorine (Latin, fluere = "to flow").

Synonym:

ICSD 34813

PDF 37-450

Fluellite Image

Images:

Fluellite

Comments: Tabular, transparent, pseudohexagonal crystals of fluellite.
Location: Tom's quarry, Kapunda, South Australia. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Fluellite Bariosincosite

Comments: Vivid green crystals of bariosincosite well placed on a matrix covered by colorless, tabular fluellite with some minor metavariscite.
Location: Eugui Quarry, Cantera Azkarate, Eugui, Navarra, Spain. Scale: Rosette size: 0.3 x 0.2 cm.
© Fabre Minerals

Fluellite Crystallography

Axial Ratios:

a:b:c =0.7615:1:1.8854

Cell Dimensions:

a = 8.546, b = 11.222, c = 21.158, Z = 8; V = 2,029.12 Den(Calc)= 2.16

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: F ddd

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

By Intensity(I/I_o): 6.48(1), 3.24(0.7), 3.09(0.6),

Forms:

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Forms: [ 0 1 0] [ 1 1 1]

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Crystal Structure:

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Guy B B , Jeffrey G A , American Mineralogist , 51 (1966) p.1579-1592, The crystal structure of fluellite, Al2PO4F2(OH).7H2O

Physical Properties of Fluellite

Cleavage:

[010] Indistinct, [111] Indistinct

Color:

Golden yellow, Colorless, Dark purple, Black.

Density:

2.18

Diaphaniety:

Transparent

Hardness:

3 - Calcite

Luminescence:

Fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Fluellite

Gladstone-Dale:

CI meas= 0.085 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.077 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2289,KPDmeas= 0.2268,KC= 0.2479

Optical Data:

Biaxial (+), a=1.473-1.49, b=1.49-1.496, g=1.506-1.511, bire=0.0210-0.0330

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Fluellite

Electron Density:

r_electron=2.23 gm/cc
note: r_Fluellite=2.16 gm/cc.

Fermion Index

Fermion Index = 0.00028
Boson Index = 0.99972

Photoelectric:

PE_Fluellite= 1.09 barns/electron
U=PE_Fluellite x r_electron= 2.43 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Fluellite is Not Radioactive

Fluellite Classification

Dana Class:

42.6.9.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.6)where (AB)2 (XO4) Zq · x(H2O)

(42.6.9)Dana Group

42.6.9.1 Fluellite Al2(PO4)F2(OH)·7(H2O) F ddd 2/m 2/m 2/m

Strunz Class:

VII/D.18-30 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.18 - Senegalite - Fluellite series

VII/D.18-10 Senegalite Al2(PO4)(OH)3·(H2O) P na2₁ mm2

VII/D.18-20 Bulachite Al2(AsO4)(OH)3·3(H2O) Pmnm,P 2₁221,Pma2,P mn2₁ Ortho

VII/D.18-30 Fluellite Al2(PO4)F2(OH)·7(H2O) F ddd 2/m 2/m 2/m

Other Fluellite Information

References:

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

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

Fluellite

Al2(PO4)F2(OH)·7(H2O)
Dana No: 42.6.9.1 Strunz No: VII/D.18-30
Locality:

Notes: