Francoanellite Mineral Data

Francoanellite Mineral Data +

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General Francoanellite Information

Chemical Formula:

H6(K,Na)3(Al,Fe+++)5(PO4)8·13(H2O)

Composition:

Molecular Weight = 1,242.49 gm

Potassium 4.72 % K 5.69 % K₂O

Sodium 2.78 % Na 3.74 % Na₂O

Aluminum 9.77 % Al 18.46 % Al₂O₃

Iron 2.25 % Fe 3.21 % Fe₂O₃

Phosphorus 19.94 % P 45.70 % P₂O₅

Hydrogen 2.60 % H 23.20 % H₂O

Oxygen 57.95 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

H₆K_1.5Na_1.5Al_4.5Fe³⁺_0.5(PO₄)₈·13(H₂O)

Environment:

Occurs at the contact of "terra rossa" with bat guano in the karst cave.

IMA Status:

Approved IMA 1976

Locality:

Grotte di Castellana, Puglia, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for Franco Anelli, professor of geography, University of Bari, Italy, who discovered the cave in which the mineral was found.

Synonym:

ICSD 407357

PDF 29-980

Francoanellite Image

Images:

Francoanellite

Comments: Chalky massive francoanellite.
Location: Giottodi Castellana Cave, Puglia, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Francoanellite Crystallography

Axial Ratios:

a:c = 1:9.47187

Cell Dimensions:

a = 8.71, c = 82.5, Z = 6; V = 5,420.27 Den(Calc)= 2.28

Crystal System:

TrigonalSpace Group: R 3c or R 3c

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

By Intensity(I/I_o): 13.83(1), 3.4(0.65), 2.799(0.62),

Physical Properties of Francoanellite

Color:

Yellowish white.

Density:

2.26

Habit:

Nodular - Tuberose forms having irregular protuberances over the surface.

Habit:

Pulverulent - Forms a loose, poorly-coherent powdery mass.

Hardness:

1-2 - Between Talc and Gypsum

Streak:

white

Optical Properties of Francoanellite

Gladstone-Dale:

CI meas= 0.01 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.019 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2248,KPDmeas= 0.2268,KC= 0.2291

Optical Data:

Uniaxial (+), w=1.51, e=1.515, bire=0.0050.

Calculated Properties of Francoanellite

Electron Density:

r_electron=2.29 gm/cc
note: r_{Francoanellite}=2.26 gm/cc.

Fermion Index

Fermion Index = 0.00076
Boson Index = 0.99924

Photoelectric:

PE_{Francoanellite}= 2.45 barns/electron
U=PE_{Francoanellite} x r_electron= 5.59 barns/cc.

Radioactivity:

GRapi = 68.89 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Francoanellite - barely detectable

Francoanellite Classification

Dana Class:

39.3.5.2 (39)Hydrated Acid Phosphates, etc

(39.3)with miscellaneous formulae

(39.3.5)Dana Group

39.3.5.1 Hannayite (NH4)2Mg3H4(PO4)4·8(H2O) P1 1

39.3.5.2 Francoanellite H6(K,Na)3(Al,Fe)5(PO4)8·13(H2O) R 3c or R 3c Trig

Strunz Class:

VII/C.21-10 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+

VII/C.21 - Francoanellite - Taranakite series

VII/C.21-10 Francoanellite H6(K,Na)3(Al,Fe)5(PO4)8·13(H2O) R 3c or R 3c Trig

VII/C.21-20 Taranakite K3Al5(HPO4)6(PO4)2·18(H2O) R 3c 3 2/m

VII/C.21-30 Haigerachite! KFe3(H2PO4)6(HPO4)2·4(H2O) C 2/c 2/m

Other Francoanellite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

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

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

Francoanellite

H6(K,Na)3(Al,Fe+++)5(PO4)8·13(H2O)
Dana No: 39.3.5.2 Strunz No: VII/C.21-10
Locality:

Notes: