Phosphovanadylite Mineral Data

General Phosphovanadylite Information

Chemical Formula:

(Ba,Ca,K,Na)x[(V,Al)4P2(O,OH)16]•12(H2O) x~0.66

Composition:

Molecular Weight = 795.71 gm

Potassium 0.49 % K 0.59 % K₂O

Barium 6.90 % Ba 7.71 % BaO

Sodium 0.29 % Na 0.39 % Na₂O

Calcium 1.01 % Ca 1.41 % CaO

Aluminum 1.70 % Al 3.20 % Al₂O₃

Vanadium 21.77 % V 38.86 % V₂O₅

Phosphorus 7.79 % P 17.84 % P₂O₅

Hydrogen 3.76 % H 33.62 % H₂O

Oxygen 56.30 % O

______ ______

100.00 % 103.62 % = TOTAL OXIDE

Empirical Formula:

Ba_0.4Ca_0.2K_0.1Na_0.1V⁵⁺_3.4Al_0.5P₂O_10.3(OH)_5.7ï¿½12(H₂O)

Environment:

Meade Peak Member of the Permian Phosphoria Formation in phosphatic organic-matter-rich mudstone..

IMA Status:

Approved IMA 1996 (Dana # Added)

Locality:

Monsanto's Enoch Valley mine, Soda Springs, Idaho, USA. Link to MinDat.org Location Data.

Name Origin:

Named after its composition of phosphate and the vanadyl (V++++O2)-- group.

Name Pronunciation:

Phosphovanadylite + Pronunciation

Synonym:

IMA1996-037

Phosphovanadylite Image

Images:

Phosphovanadylite

Comments: Scanning electron microscope micrographs showing the cubic habit of phosphovanadylite. (AmMin 83:890).
Location: Phosphoria Formation at Monsantoâ€™s Enoch Valley Mine, Soda Springs, Idaho. Scale: Crystal size 40 µm.
© American Mineralogist

Phosphovanadylite Crystallography

Cell Dimensions:

a = 15.457, Z = 6; V = 3,692.97 Den(Calc)= 2.15

Crystal System:

Isometric - Hextetrahedral H-M Symbol (4 3m) Space Group: I 43m

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

By Intensity(I/I_o): 3.164(1), 2.582(0.37), 2.445(0.36),

Physical Properties of Phosphovanadylite

Color:

Light greenish blue.

Density:

2.16

Diaphaneity:

Transparent

Habit:

Blocky - Crystal shape tends to be equant (e.g. feldspars).

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Luster:

Vitreous (Glassy)

Streak:

very pale greenish blue

Optical Properties of Phosphovanadylite

Gladstone-Dale:

CI meas= 0.128 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.124 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2633,KPDmeas= 0.262,KC= 0.3004
Ncalc = 1.65

Optical Data:

Isotropic, n=1.566.

Calculated Properties of Phosphovanadylite

Electron Density:

Bulk Density (Electron Density)=2.15 gm/cc
note: Specific Gravity of Phosphovanadylite =2.15 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Phosphovanadylite}= 32.38 barns/electron
U=PE_{Phosphovanadylite} x r_electron= 69.61 barns/cc.

Radioactivity:

GRapi = 7.09 (Gamma Ray American Petroleum Institute Units)
Concentration of Phosphovanadylite per GRapi unit = 14.10 (%)

Estimated Radioactivity from Phosphovanadylite - barely detectable

Phosphovanadylite Classification

Dana Class:

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

(42.11)where (AB)4 (XO4)3 Zq ï¿½ x(H2O)

(42.11.19)Sincosite Group

42.11.19.01 Sincosite Ca(VO)2(PO4)2•5(H2O) P mmm or P 4/nmm Tetra

42.11.19.02 Bariosincosite! Ba(VO)2(PO4)2•4(H2O) P 4/n or P 4/nmm 4/m

42.11.19.03 Phosphovanadylite! (Ba,Ca,K,Na)x[(V,Al)4P2(O,OH)16]•12(H2O)x~0.66 I 43m 4 3m

Strunz Class:

08.DM.20 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DM -With large and medium-sized cations, (OH, etc.):RO4 > 2:1

08.DM.20 Phosphovanadylite! (Ba,Ca,K,Na)x[(V,Al)4P2(O,OH)16]•12(H2O)x~0.66 I 43m 4 3m

Other Phosphovanadylite Information

References:

NAME( AmMin) PHYS. PROP.(Am.Min.,Vol.83,p889-895,1998) OPTIC PROP.(AmMin)

See Also:

Links to other databases for Phosphovanadylite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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Phosphovanadylite

(Ba,Ca,K,Na)x[(V,Al)4P2(O,OH)16]•12(H2O) x~0.66
Dana No: 42.11.19.03 Strunz No: 08.DM.20
Locality:

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