Vashegyite Mineral Data

Vashegyite Mineral Data +

General Vashegyite Information

Chemical Formula:

Al11(PO4)9(OH)6·38(H2O) or Al6(PO4)5(OH)3·23(H2O)

Composition:

Molecular Weight = 1,938.16 gm

Aluminum 15.31 % Al 28.93 % Al₂O₃

Phosphorus 14.38 % P 32.96 % P₂O₅

Hydrogen 4.26 % H 38.11 % H₂O

Oxygen 66.04 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Al₁₁(PO₄)₉(OH)₆·38(H₂O)

Environment:

Found with variscite, apatite.

IMA Status:

Valid Species (Pre-IMA) 1909

Locality:

Zeleznik (Vashegy) mine, Sirk River, Slovakia, Boehmia, Czech Republic. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Vashegyite Image

Images:

Vashegyite Volborthite

Comments: Small bluish-white crystals of vashegyite with green volborthite.
Location: Jeremias Gl?ck Mine (Fairy Grotto), Garnsdorf, Saalfeld, Thuringia, Germany. Scale: Picture size 1.8 mm.
© Thomas Witzke / Abraxas-Verlag

Vashegyite Crystallography

Axial Ratios:

a:b:c =0.7186:1:1.3758

Cell Dimensions:

a = 10.773, b = 14.991, c = 20.626, Z = 2; V = 3,331.06 Den(Calc)= 1.93

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Pna2 or P na2₁

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

By Intensity(I/I_o): 10.3(1), 2.912(0.9), 7.5(0.8),

Physical Properties of Vashegyite

Cleavage:

[001] Perfect

Color:

Brownish, Brownish yellow, Yellow, White, Light green.

Density:

1.93 - 1.99, Average = 1.96

Diaphaniety:

Subtranslucent to Opaque

Habit:

Compact - Occurs as a compact mass.

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

2-3 - Gypsum-Calcite

Luminescence:

Non-fluorescent.

Luster:

Earthy (Dull)

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Vashegyite

Gladstone-Dale:

CI meas= 0.027 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2468,KPDmeas= 0.243,KC= 0.2498

Optical Data:

Biaxial (-), a=1.47, b=1.477, g=1.482, bire=0.0120

Calculated Properties of Vashegyite

Electron Density:

r_electron=1.99 gm/cc
note: r_Vashegyite=1.93 gm/cc.

Fermion Index

Fermion Index = 0.00032
Boson Index = 0.99968

Photoelectric:

PE_Vashegyite= 1.23 barns/electron
U=PE_Vashegyite x r_electron= 2.45 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Vashegyite is Not Radioactive

Vashegyite Classification

Dana Class:

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

(42.12)with miscellaneous formulae

(42.12.2)Dana Group

42.12.2.1 Vashegyite Al11(PO4)9(OH)6·38(H2O)orAl6(PO4)5(OH)3·23(H2O) Pna2 or P na2₁ mm2

Strunz Class:

VII/D.12-10 VII - Phosphates, Arsenates and Vanadates

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

VII/D.12 - Sasaite - Kribergite ? series

VII/D.12-03 Mitryaevaite! Al5[(PO4)2[(P,S)O3(OH,O)]2F2(OH)2(H2O)8·6.48(H2O) P1 1

VII/D.12-05 Sasaite (Al,Fe)14(PO4)11(SO4)(OH)7·84(H2O) P 222 or Pmm2 or P mmm Ortho

VII/D.12-10 Vashegyite Al11(PO4)9(OH)6·38(H2O)orAl6(PO4)5(OH)3·23(H2O) Pna2 or P na2₁ mm2

VII/D.12-20 Vantasselite Al4(PO4)3(OH)3·9(H2O) Pma2,P 2₁am,Pmam Ortho

VII/D.12-30 Sanjuanite Al2(PO4)(SO4)(OH)·9(H2O) P1 or P1 Tri

VII/D.12-40 Kribergite Al5(PO4)3(SO4)(OH)4·4(H2O) P1 or P1 Tri

Other Vashegyite Information

References:

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

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Vashegyite

Al11(PO4)9(OH)6·38(H2O) or Al6(PO4)5(OH)3·23(H2O)
Dana No: 42.12.2.1 Strunz No: VII/D.12-10
Locality:

Notes: