Johntomaite Mineral Data

Johntomaite Mineral Data

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General Johntomaite Information

Chemical Formula:

Ba(Fe++,Ca,Mn++)2Fe+++2(PO4)3(OH)3

Composition:

Molecular Weight = 690.07 gm

Barium 19.90 % Ba 22.22 % BaO

Calcium 2.32 % Ca 3.25 % CaO

Manganese 2.39 % Mn 3.08 % MnO

Iron 26.71 % Fe 13.53 % FeO / 23.14 % Fe₂O₃

Phosphorus 13.47 % P 30.85 % P₂O₅

Hydrogen 0.44 % H 3.92 % H₂O

Oxygen 34.78 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BaFe²⁺_1.3Ca_0.4Mn²⁺_0.3Fe³⁺₂(PO₄)₃(OH)₃

Environment:

Occurs as an extremely rare mineral on the mine dumps. Fe 2+ -analogue of perloffite and new member of the bjarebyite group of barium phosphates.

IMA Status:

Approved IMA 1999 (Dana # Added)

Locality:

Spring Creek copper mine near Wilmington in the southern Flinders Ranges of South Australia. Link to MinDat.org Location Data.

Name Origin:

Named after Mr. John Toma, amateur mineralogist and finder of the mineral.

Synonym:

IMA1999-009

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Johntomaite Crystallography

Axial Ratios:

a:b:c =0.7443:1:0.4048

Cell Dimensions:

a = 9.199, b = 12.359, c = 5.004, Z = 2; beta = 100.19° V = 559.93 Den(Calc)= 4.09

Crystal System:

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

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

By Intensity(I/I_o): 3.159(1)(031,221), 2.749(0.5)(221,311), 2.983(0.5)(211),3.091(0.4)(131), 4.573(0.4)(011), 9.1(0.3), 5.11(0.2),

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Forms: [ 1 3 1] [ 0 0 1] [ 1 0 0]

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Physical Properties of Johntomaite

Cleavage:

[100] Perfect

Color:

Greenish black.

Density:

4.05

Diaphaniety:

Translucent to opaque

Fracture:

Irregular - Flat surfaces (not cleavage) fractured in an irregular pattern.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous - Greasy

Streak:

dark greenish gray

Optical Properties of Johntomaite

Optical Data:

Biaxial (-), a=1.817, b=1.829, g=1.837, bire=0.0200, 2V(Calc)=78, 2V(Meas)=80-85. Dispersion strong.

Calculated Properties of Johntomaite

Electron Density:

r_electron=3.86 gm/cc
note: r_Johntomaite=4.09 gm/cc.

Fermion Index

Fermion Index = 0.04132
Boson Index = 0.95868

Photoelectric:

PE_Johntomaite= 94.45 barns/electron
U=PE_Johntomaite x r_electron= 364.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Johntomaite is Not Radioactive

Johntomaite Classification

Dana Class:

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

(41.9)where (A B)5 (XO4)3 Zq

(41.9.1)Dana Group

41.9.1.1 Kulanite Ba(Fe,Mn,Mg)2Al2(PO4)3(OH)3 P 2₁/m 2/m

41.9.1.2 Penikisite BaMg2Al2(PO4)3(OH)3 P1 1

41.9.1.3 Bjarebyite (Ba,Sr)(Mn,Fe,Mg)2Al2(PO4)3(OH)3 P 2₁/m 2/m

41.9.1.4 Perloffite Ba(Mn,Fe)2Fe2(PO4)3(OH)3 P 2₁/m 2/m

41.9.1.5 Johntomaite ! Ba(Fe,Ca,Mn)2Fe2(PO4)3(OH)3 P 2₁/m 2/m

Strunz Class:

VII/B.29-35 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.29 - Bjarebyite group

VII/B.29-10 Penikisite BaMg2Al2(PO4)3(OH)3 P1 1

VII/B.29-20 Kulanite Ba(Fe,Mn,Mg)2Al2(PO4)3(OH)3 P 2₁/m 2/m

VII/B.29-30 Bjarebyite (Ba,Sr)(Mn,Fe,Mg)2Al2(PO4)3(OH)3 P 2₁/m 2/m

VII/B.29-35 Johntomaite Ba(Fe,Ca,Mn)2Fe2(PO4)3(OH)3 P 2₁/m 2/m

VII/B.29-40 Perloffite Ba(Mn,Fe)2Fe2(PO4)3(OH)3 P 2₁/m 2/m

VII/B.29-50 Jagowerite BaAl2(PO4)2(OH)2 P1 1

VII/B.29-60 Vesignieite Cu3Ba(VO4)2(OH)2 C 2/m 2/m

VII/B.29-70 Drugmanite Pb2(Fe,Al)H(PO4)2(OH)2 P 2₁/a 2/m

VII/B.29-80 Mounanaite PbFe2(VO4)2(OH)2 P1 1

Other Johntomaite Information

References:

NAME( MinPet, Vol 70, p 1-14) PHYS. PROP.(MinPet, Vol 70, p 1-14) OPTIC PROP.(MinPet, Vol 70, p 1-14)

See Also:

Links to other databases for Johntomaite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -Mineralogy and Petrology 12 -QUT Mineral Atlas

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Print or Cut-and-Paste your Johntomaite Specimen Label here :

Johntomaite

Ba(Fe++,Ca,Mn++)2Fe+++2(PO4)3(OH)3
Dana No: 41.9.1.5 Strunz No: VII/B.29-35
Locality:

Notes: