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Francoanellite Mineral Data

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General Francoanellite Information

Help on Chemical  Formula: Chemical Formula: H6(K,Na)3(Al,Fe+++)5(PO4)8•13(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: H6K1.5Na1.5Al4.5Fe3+0.5(PO4)8•13(H2O)
Help on Environment: Environment: Occurs at the contact of "terra rossa" with bat guano in the karst cave.
Help on IMA Status: IMA Status: Approved IMA 1976
Help on Locality: Locality: Grotte di Castellana, Puglia, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Franco Anelli, professor of geography, University of Bari, Italy, who discovered the cave in which the mineral was found.
Help on Name Pronunciation: Name Pronunciation: Francoanellite + Pronunciation Say FRANCOANELLITE
Help on Synonym: Synonym: ICSD 407357
  PDF 29-980

Francoanellite Image

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

Francoanellite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:9.47187
Help on Cell Dimensions: Cell Dimensions: a = 8.71, c = 82.5, Z = 6; V = 5,420.27 Den(Calc)= 2.28
Help on Crystal System: Crystal System: Trigonal Space Group: R 3c or R 3c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 13.83(1), 3.4(0.65), 2.799(0.62),

Physical Properties of Francoanellite

Help on Color: Color: Yellowish white.
Help on Density: Density: 2.26
Help on Habit: Habit: Nodular - Tuberose forms having irregular protuberances over the surface.
Help on Habit: Habit: Pulverulent - Forms a loose, poorly-coherent powdery mass.
Help on Hardness: Hardness: 1-2 - Between Talc and Gypsum
Help on Streak: Streak: white

Optical Properties of Francoanellite

Help on Gladstone-Dale: 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
Ncalc = 1.52
Help on Optical Data: Optical Data: Uniaxial (+), w=1.51, e=1.515, bire=0.0050.

Calculated Properties of Francoanellite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.29 gm/cc
note: Specific Gravity of Francoanellite =2.26 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.000764144
Boson Index = 0.999235856
Help on Photoelectric: Photoelectric: PEFrancoanellite = 2.45 barns/electron
U=PEFrancoanellite x relectron= 5.59 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 68.89 (Gamma Ray American Petroleum Institute Units)
Concentration of Francoanellite per GRapi unit = 1.45 (%)

Estimated Radioactivity from Francoanellite - barely detectable


Francoanellite Classification

Help on  Dana Class: Dana Class: (39)Hydrated Acid Phosphates, etc
  (39.03)with miscellaneous formulae
  (39.03.05)Dana Group Hannayite (NH4)2Mg3H4(PO4)4•8(H2O) P1 1 Francoanellite H6(K,Na)3(Al,Fe)5(PO4)8•13(H2O) R 3c or R 3c Trig
Help on  Strunz Class: Strunz Class: 08.CH.25 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CH -With large and medium-sized cations, RO4:H2O < 1:1
08.CH.25 Francoanellite H6(K,Na)3(Al,Fe)5(PO4)8•13(H2O) R 3c or R 3c Trig
08.CH.25 Taranakite K3Al5(HPO4)6(PO4)2•18(H2O) R 3c 3 2/m

Other Francoanellite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Francoanellite :
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

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


Dana No: Strunz No: 08.CH.25





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