Stanekite Mineral Data

Stanekite Mineral Data +

General Stanekite Information

Chemical Formula:

Fe+++(Mn,Fe++,Mg)(PO4)O

Composition:

Molecular Weight = 218.97 gm

Magnesium 1.11 % Mg 1.84 % MgO

Manganese 15.05 % Mn 19.44 % MnO

Iron 33.16 % Fe 9.84 % FeO / 36.47 % Fe₂O₃

Phosphorus 14.15 % P 32.41 % P₂O₅

Oxygen 36.53 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺Mn²⁺_0.6Fe²⁺_0.3Mg_0.1(PO₄)O

Environment:

Related to triploidite and wolfeite.

IMA Status:

Approved IMA 1997 (Dana # Added)

Locality:

The Clementine II pegamtite, Okatjimukuja farm, Karibib, Namibia. Link to MinDat.org Location Data.

Name Origin:

Named after Josef Stanek (1928-1995), Professor of Mineralogy, Masarykov University, Brno, Czech Republic, a specialist in phosphate mineralogy.

Synonym:

IMA1994-045

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Stanekite Crystallography

Axial Ratios:

a:b:c =0.9353:1:0.7888

Cell Dimensions:

a = 11.844, b = 12.662, c = 9.989, Z = 16; beta = 105.933° V = 1,440.49 Den(Calc)= 4.04

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

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

By Intensity(I/I_o): 2.971(1), 2.809(0.85), 2.857(0.58),

Crystal Structure:

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Keller P , Lissner F , Schleid T , European Journal of Mineralogy , 18 (2006) p.113-118, The crystal structure of stanekite, (Fe3+,Mn2+,Fe2+,Mg)2[PO4]O, from Okatjimukuju,, Karibib (Namibia), and its relationship to the polymorphs of synthetic Fe2[PO4]O, Locality: Okatjimukuju, Karibib, Namibia, Note: Uiso(O4) corrected

Physical Properties of Stanekite

Cleavage:

[hk0] Parting

Color:

Black.

Density:

3.8

Diaphaniety:

Opaque to subtranslucent

Fracture:

Splintery - Thin, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende).

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Hardness:

4-5 - Fluorite-Apatite

Luster:

Sub Metallic

Streak:

dark brown

Optical Properties of Stanekite

Optical Data:

Biaxial (?), a=2.01, b=2.11,

RL Anisotrophism:

Distinct, pale brownish gray.

RL Bireflectance:

Weak.

RL Color:

Pale gray with reddish yellow to brownish red internal reflections.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Stanekite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	12.86	15.20
420 nm	11.90	14.00
440 nm	11.15	13.05
460 nm	10.90	12.75
480 nm	10.75	12.46
500 nm	10.57	12.33
520 nm	10.41	12.33
540 nm	10.48	12.26
560 nm	10.52	12.25
580 nm	10.68	12.29
600 nm	10.69	12.31
620 nm	10.75	12.30
640 nm	10.77	12.35
660 nm	10.80	12.42
680 nm	10.72	12.33
700 nm	10.54	12.15

**Calculated Relative Intensity Colors of Stanekite in Air**
Relative Intensity	0%	90%	100%	180%	270%	360%	450%	540%	630%	720%	810%	830%
R₁
R₂

Calculated Properties of Stanekite

Electron Density:

r_electron=3.87 gm/cc
note: r_Stanekite=4.04 gm/cc.

Fermion Index

Fermion Index = 0.00831
Boson Index = 0.99169

Photoelectric:

PE_Stanekite= 14.64 barns/electron
U=PE_Stanekite x r_electron= 56.74 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Stanekite is Not Radioactive

Stanekite Classification

Dana Class:

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

(41.6)where (A)2 (XO4) Zq

(41.6.3)Dana Group

41.6.3.1 Wolfeite (Fe,Mn)2(PO4)(OH) P 2₁/a 2/m

41.6.3.2 Triploidite (Mn,Fe)2(PO4)(OH) P 2₁/a 2/m

41.6.3.3 Sarkinite Mn2(AsO4)(OH) P 2₁/a 2/m

41.6.3.4 Stanekite ! Fe(Mn,Fe,Mg)(PO4)O P 2₁/a 2/m

41.6.3.5 IMA2004-009! Mg2(PO4)(OH) P 2₁/c 2/m

Strunz Class:

VII/B.03-65 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.03 - Wagnerite - Sarkinite series

VII/B.03-10 Wagnerite (Mg,Fe)2(PO4)F P 2₁/a 2/m

VII/B.03-20 Magniotriplite? (Mg,Fe,Mn)2(PO4)F P 2₁/a 2/m

VII/B.03-30 Zwieselite (Fe,Mn)2(PO4)F I2/a 2/m

VII/B.03-40 Triplite (Mn,Fe,Mg,Ca)2(PO4)(F,OH) I2/m 2/m

VII/B.03-50 Wolfeite (Fe,Mn)2(PO4)(OH) P 2₁/a 2/m

VII/B.03-60 Triploidite (Mn,Fe)2(PO4)(OH) P 2₁/a 2/m

VII/B.03-65 Stanekite Fe(Mn,Fe,Mg)(PO4)O P 2₁/a 2/m

VII/B.03-70 Sarkinite Mn2(AsO4)(OH) P 2₁/a 2/m

Other Stanekite Information

References:

NAME( MinRec) PHYS. PROP.(Eur. J. Min.,Vol.9,p475-482,1997) OPTIC PROP.(AntBidBlaNic4, MinRec)

See Also:

Links to other databases for Stanekite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Stanekite

Fe+++(Mn,Fe++,Mg)(PO4)O
Dana No: 41.6.3.4 Strunz No: VII/B.03-65
Locality:

Notes: