Gladiusite Mineral Data

Gladiusite Mineral Data

General Gladiusite Information

Chemical Formula:

Fe+++2(Fe++,Mg)4(PO4)(OH)13·H2O

Composition:

Molecular Weight = 579.01 gm

Magnesium 6.72 % Mg 11.14 % MgO

Manganese 0.95 % Mn 1.23 % MnO

Iron 40.51 % Fe 57.92 % Fe₂O₃

Phosphorus 5.35 % P 12.26 % P₂O₅

Hydrogen 2.26 % H 20.22 % H₂O

Oxygen 44.21 % O

______ ______

100.00 % 102.76 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺_2.2Fe³⁺₂Mg_1.6Mn²⁺_0.1(PO₄)(OH)₁₁·(H₂O)

Environment:

Hydrothermal mineral associated with vugs in a dolomite carbonatite.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Kovdor alkaline-ultramafic complex, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Name alludes to the crystal morphology which resembles a double edged sword (gladius, Latin for sword).

Synonym:

IMA1998-011

Gladiusite Image

Images:

Gladiusite

Comments: Radiating group of dark olive-greenish acicular crystals of gladiusite on matrix.
Location: Kovdor Mine, Kovdor massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture size 1.2 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Gladiusite

Comments: SEM photomicrograph showing the morphology of the free-standing crystals of gladiusite. (CanMin v. 38, p 1480).
Location: Kovdor alkaline-ultramafic complex, Kola Peninsula, Russia. Scale: See Image.
© Canadian Mineralogist

Gladiusite Crystallography

Axial Ratios:

a:b:c =1.4557:1:0.5378

Cell Dimensions:

a = 16.959, b = 11.65, c = 6.266, Z = 4; beta = 90° V = 1,237.99 Den(Calc)= 3.11

Crystal System:

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

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

By Intensity(I/I_o): 4.805(1)(220), 5.83(0.89)(020), 3.533(0.84)(230),6.87(0.77)(210), 2.868(0.66)(140,430), 3.787(0.62), 9.61(0.53)(110),

Forms:

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Forms: [ 12 1 1] [ 6 1 0]

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Crystal Structure:

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Sokolova E V , Hawthorne F C , McCammon C A , Liferovich R P , The Canadian Mineralogist , 39 (2001) p.1121-1130, The crystal structure of gladiusite, (Fe,Mg)4Fe2(PO4)(OH)11(H2O)

Physical Properties of Gladiusite

Cleavage:

None

Color:

Dark green.

Density:

3.11

Diaphaniety:

Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Hardness:

4-4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

olive green

Optical Properties of Gladiusite

Gladstone-Dale:

CI meas= 0.214 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.214 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2346,KPDmeas= 0.2346,KC= 0.2983

Optical Data:

Biaxial (-), a=1.722, b=1.73, g=1.737, bire=0.0150

Calculated Properties of Gladiusite

Electron Density:

r_electron=3.08 gm/cc
note: r_Gladiusite=3.11 gm/cc.

Fermion Index

Fermion Index = 0.01552
Boson Index = 0.98448

Photoelectric:

PE_Gladiusite= 12.60 barns/electron
U=PE_Gladiusite x r_electron= 38.83 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gladiusite is Not Radioactive

Gladiusite Classification

Dana Class:

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

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.18)Dana Group

42.11.18.1 Whitmoreite FeFe2(PO4)2(OH)2·4(H2O) P 2₁/c 2/m

42.11.18.2 Arthurite CuFe2(AsO4,PO4,SO4)2(O,OH)2·4(H2O) P 2₁/c 2/m

42.11.18.3 Ojuelaite ZnFe2(AsO4)2(OH)2·4(H2O) P 2₁/c 2/m

42.11.18.4 Earlshannonite (Mn,Fe)Fe2(PO4)2(OH)2·4(H2O) P 2₁/c 2/m

42.11.18.5 Gladiusite ! Fe2(Fe,Mg)4(PO4)(OH)13·H2O P 2₁/n 2/m

42.11.18.6 Cobaltarthurite! CoFe2(AsO4)2(OH)2·4(H2O) P 2₁/c 2/m

Strunz Class:

VII/D.03-05 VII - Phosphates, Arsenates and Vanadates

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

VII/D.03 - Giniite - Schoonerite series

VII/D.03-05 Gladiusite Fe2(Fe,Mg)4(PO4)(OH)13·H2O P 2₁/n 2/m

VII/D.03-10 Giniite FeFe4(PO4)4(OH)2·2(H2O) P 2/a 2/m

VII/D.03-15 Kaluginite* (Mn,Ca)MgFe(PO4)2(OH)·4(H2O) C cca 2/m 2/m 2/m

VII/D.03-20 Landesite (Mn,Mg)9Fe3(PO4)8(OH)3·9(H2O) Pmna 2/m 2/m 2/m

VII/D.03-30 Schoonerite Fe2ZnMnFe(PO4)3(OH)2·9(H2O) Pmab 2/m 2/m 2/m

Other Gladiusite Information

References:

NAME( AmMin, Vol 86, p1113) PHYS. PROP.(AmMin, Vol 86, p1113) OPTIC PROP.(AmMin, Vol 86, p1113)

See Also:

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

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Gladiusite

Fe+++2(Fe++,Mg)4(PO4)(OH)13·H2O
Dana No: 42.11.18.5 Strunz No: VII/D.03-05
Locality:

Notes: