Viitaniemiite Mineral Data

Viitaniemiite Mineral Data +

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General Viitaniemiite Information

Chemical Formula:

Na(Ca,Mn++)Al(PO4)(F,OH)3

Composition:

Molecular Weight = 241.11 gm

Sodium 9.53 % Na 12.85 % Na₂O

Calcium 14.96 % Ca 20.93 % CaO

Manganese 2.28 % Mn 2.94 % MnO

Aluminum 11.19 % Al 21.14 % Al₂O₃

Phosphorus 12.85 % P 29.44 % P₂O₅

Hydrogen 0.50 % H 4.48 % H₂O

Oxygen 34.51 % O

Fluorine 14.18 % F 14.18 % F

- % F -5.97 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaCa_0.9Mn²⁺_0.1Al(PO₄)F_1.8(OH)_1.2

Environment:

In cavities of a silicocarbonate sill found as inclusions in esosphorite.

IMA Status:

Approved IMA 1981

Locality:

Viitaniemi granite pegmatite, Erajarvi, Orivesi, Finland. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 40096

PDF 33-1226

Viitaniemiite Image

Images:

Click Here for Larger Viitaniemiite Image

Viitaniemiite Roscherite

Comments: Colorless to pink viitaniemiite with brownish roscherite.
Location: Greifenstein Rocks, Ehrenfriedersdorf, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Viitaniemiite Crystallography

Axial Ratios:

a:b:c =0.9564:1:0.7625

Cell Dimensions:

a = 6.832, b = 7.143, c = 5.447, Z = 2; beta = 109.367° V = 250.78 Den(Calc)= 3.19

Crystal System:

MonoclinicSpace Group: P 2₁,P 2₁/m

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

By Intensity(I/I_o): 2.883(1), 2.937(0.5), 3.223(0.46),

Crystal Structure:

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Pajunen A , Lahti S I , American Mineralogist , 69 (1984) p.961-966, The crystal structure of viitaniemiite, Locality: Viitaniemi pegmatite, Orivesi, southern Finland

Physical Properties of Viitaniemiite

Cleavage:

[101] Distinct

Color:

Colorless, Gray, Gray white, White.

Density:

3.06 - 3.245, Average = 3.15

Habit:

Inclusions - Generally found as inclusions in other minerals.

Hardness:

5 - Apatite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Viitaniemiite

Gladstone-Dale:

CI meas= 0.076 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.087 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1769,KPDmeas= 0.179,KC= 0.1937

Optical Data:

Biaxial (-), a=1.557, b=1.565, g=1.571, bire=0.0140, 2V(Calc)=80, 2V(Meas)=81.

Calculated Properties of Viitaniemiite

Electron Density:

r_electron=3.10 gm/cc
note: r_{Viitaniemiite}=3.15 gm/cc.

Fermion Index

Fermion Index = 0.00036
Boson Index = 0.99964

Photoelectric:

PE_{Viitaniemiite}= 3.60 barns/electron
U=PE_{Viitaniemiite} x r_electron= 11.17 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Viitaniemiite is Not Radioactive

Viitaniemiite Classification

Dana Class:

41.3.5.1 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.3)where (A B)3 (XO4) Zq

(41.3.5)Dana Group

41.3.5.1 Viitaniemiite Na(Ca,Mn)Al(PO4)(F,OH)3 P 2₁,P 2₁/m Mono

Strunz Class:

VII/B.12-30 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds

VII/B.12 - Pseudomalachite group, Brazilianite - Viitaniemiite series

VII/B.12-10 Brazilianite NaAl3(PO4)2(OH)4 P 2₁/n 2/m

VII/B.12-20 Augelite Al2(PO4)(OH)3 C 2/m 2/m

VII/B.12-30 Viitaniemiite Na(Ca,Mn)Al(PO4)(F,OH)3 P 2₁,P 2₁/m Mono

Other Viitaniemiite Information

References:

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

See Also:

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

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Viitaniemiite

Na(Ca,Mn++)Al(PO4)(F,OH)3
Dana No: 41.3.5.1 Strunz No: VII/B.12-30
Locality:

Notes: