Wardite Mineral Data

Wardite Mineral Data +

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General Wardite Information

Chemical Formula:

NaAl3(PO4)2(OH)4·2(H2O)

Composition:

Molecular Weight = 397.94 gm

Sodium 5.78 % Na 7.79 % Na₂O

Aluminum 20.34 % Al 38.43 % Al₂O₃

Phosphorus 15.57 % P 35.67 % P₂O₅

Hydrogen 2.03 % H 18.11 % H₂O

Oxygen 56.29 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaAl₃(PO₄)₂(OH)₄·2(H₂O)

Environment:

Alteration product of amblygonite in pegmatites and phosphate deposits.

IMA Status:

Valid Species (Pre-IMA) 1896

Locality:

Clay Canyon, Fairfield, Utah County, Utah, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Henry Augustus Ward (1834-1906), mineral dealer and collector, Rochester, New York, USA.

Synonym:

ICSD 6300

PDF 33-1202

Wardite Image

Images:

Wardite Gordonite

Comments: Prismatic gordonite crystals on massive wardite.
Location: Clay Canyon, Fairfield, Utah County, Utah, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Wardite

Comments: Cream-colored, blocky wardite crystals. The largest wardite crystal is 0.5 cm across.
Location: Taquaral, Minas Gerais, Brazil. Scale: Picture size 1.5 cm.
© John Veevaert

Images:

Wardite Crandallite

Comments: Sliced and polished slab of yellow to white mixture of wardite and crandallite.
Location: Clay Canyon, Fairfield, Utah Co., Utah, USA. Scale: 11x6x.6 cm.
© John Betts - Fine Minerals

Wardite Crystallography

Axial Ratios:

a:c = 1:2.70049

Cell Dimensions:

a = 7.0587, c = 19.062, Z = 4; V = 949.77 Den(Calc)= 2.78

Crystal System:

Tetragonal - TrapezohedralH-M Symbol (4 2 2) Space Group: P 4₁2₁2

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

By Intensity(I/I_o): 4.725(1), 2.999(0.75), 3.086(0.75),

Crystal Structure:

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Fanfani L , Nunzi A , Zanazzi P F , Mineralogical Magazine , 37 (1970) p.598-605, The crystal structure of wardite, Locality: Fairfield, Utah, USA

Physical Properties of Wardite

Cleavage:

[001] Perfect

Color:

Blue green, Colorless, White, Light green.

Density:

2.81 - 2.87, Average = 2.84

Diaphaniety:

Transparent to Translucent

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

5 - Apatite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Wardite

Gladstone-Dale:

CI meas= 0.048 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2152,KPDmeas= 0.2107,KC= 0.2212

Optical Data:

Uniaxial (+), w=1.59-1.597, e=1.599-1.607, bire=0.0090-0.0100.

Calculated Properties of Wardite

Electron Density:

r_electron=2.79 gm/cc
note: r_Wardite=2.78 gm/cc.

Fermion Index

Fermion Index = 0.00027
Boson Index = 0.99973

Photoelectric:

PE_Wardite= 1.47 barns/electron
U=PE_Wardite x r_electron= 4.10 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Wardite is Not Radioactive

Wardite Classification

Dana Class:

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

(42.7)where (AB)5 (XO4)3 Zq · x(H2O)

(42.7.8)Dana Group

42.7.8.1 Cyrilovite NaFe3(PO4)2(OH)4·2(H2O) P 4₁2₁21,P 4₃2₁21 4 2 2

42.7.8.2 Wardite NaAl3(PO4)2(OH)4·2(H2O) P 4₁2₁2 4 2 2

Strunz Class:

VII/D.51-10 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.51 - Wardite - Millisite series

VII/D.51-10 Wardite NaAl3(PO4)2(OH)4·2(H2O) P 4₁2₁2 4 2 2

VII/D.51-20 Cyrilovite NaFe3(PO4)2(OH)4·2(H2O) P 4₁2₁21,P 4₃2₁21 4 2 2

VII/D.51-30 Millisite (Na,K)CaAl6(PO4)4(OH)9·3(H2O) P 4₁2₁2,P 4₃2₁2 4 2 2

Other Wardite Information

References:

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

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Wardite

NaAl3(PO4)2(OH)4·2(H2O)
Dana No: 42.7.8.2 Strunz No: VII/D.51-10
Locality:

Notes: