Mineralogy Database

Johntomaite Mineral Data

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General Johntomaite Information

Help on Chemical  Formula: Chemical Formula: Ba(Fe++,Ca,Mn++)2Fe+++2(PO4)3(OH)3
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: BaFe2+1.3Ca0.4Mn2+0.3Fe3+2(PO4)3(OH)3
Help on Environment: 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.
Help on IMA Status: IMA Status: Approved IMA 1999 (Dana # Added)
Help on Locality: Locality: Spring Creek copper mine near Wilmington in the southern Flinders Ranges of South Australia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Mr. John Toma, amateur mineralogist and finder of the mineral.
Help on Synonym: Synonym: IMA1999-009

Johntomaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7443:1:0.4048
Help on Cell Dimensions: Cell Dimensions: a = 9.199, b = 12.359, c = 5.004, Z = 2; beta = 100.19° V = 559.93 Den(Calc)= 4.09
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 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),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 3 1) ( 0 0 1) ( 1 0 0)

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Physical Properties of Johntomaite

Help on Cleavage: Cleavage: {100} Perfect
Help on Color: Color: Greenish black.
Help on Density: Density: 4.05
Help on Diaphaneity: Diaphaneity: Translucent to opaque
Help on Fracture: Fracture: Irregular - Flat surfaces (not cleavage) fractured in an irregular pattern.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: dark greenish gray

Optical Properties of Johntomaite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.024 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2024,KPDmeas= 0.2044,KC= 0.2094
Ncalc = 1.85 - 1.86
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.82 gm/cc
note: Specific Gravity of Johntomaite =4.05 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEJohntomaite = 94.45 barns/electron
U=PEJohntomaite x rElectron Density= 360.65 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Johntomaite is Not Radioactive

Johntomaite Classification

Help on  Dana Class: Dana Class: (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.09)where (A B)5 (XO4)3 Zq
  (41.09.01)Kulanite Group Kulanite Ba(Fe,Mn,Mg)2Al2(PO4)3(OH)3 P 21/m 2/m Penikisite BaMg2Al2(PO4)3(OH)3 P1 1 Bjarebyite (Ba,Sr)(Mn,Fe,Mg)2Al2(PO4)3(OH)3 P 21/m 2/m Perloffite Ba(Mn,Fe)2Fe2(PO4)3(OH)3 P 21/m 2/m Johntomaite! Ba(Fe,Ca,Mn)2Fe2(PO4)3(OH)3 P 21/m 2/m
Help on  Strunz Class: Strunz Class: 08.BH.20 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BH -With medium-sized and large cations, (OH,etc.):RO4 = 1:1
08.BH.20 Bjarebyite (Ba,Sr)(Mn,Fe,Mg)2Al2(PO4)3(OH)3 P 21/m 2/m
08.BH.20 Kulanite Ba(Fe,Mn,Mg)2Al2(PO4)3(OH)3 P 21/m 2/m
08.BH.20 Penikisite BaMg2Al2(PO4)3(OH)3 P1 1
08.BH.20 Perloffite Ba(Mn,Fe)2Fe2(PO4)3(OH)3 P 21/m 2/m
08.BH.20 Johntomaite! Ba(Fe,Ca,Mn)2Fe2(PO4)3(OH)3 P 21/m 2/m

Other Johntomaite Information

Help on References: References: NAME( MinPet, Vol 70, p 1-14) PHYS. PROP.(MinPet, Vol 70, p 1-14) OPTIC PROP.(MinPet, Vol 70, p 1-14)
Help on See Also: See Also: Links to other databases for Johntomaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Mineralogy and Petrology
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Dana No: Strunz No: 08.BH.20





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