Johntomaite Mineral Data

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),

Forms:

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

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Crystal Structure:

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Kolitsch U , Pring A , Tiekink E R T , Mineralogy and Petrology , 70 (2000) p.1-14, Johntomaite, a new member of the bjarebyite group of barium phosphates:, description and structure refinement, Locality: Spring Creek copper mine, southern Flinders Ranges, South Australia

Physical Properties of Johntomaite

Cleavage:

{100} Perfect

Color:

Greenish black.

Density:

4.05

Diaphaneity:

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

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

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:

Bulk Density (Electron Density)=3.82 gm/cc
note: Specific Gravity of Johntomaite =4.05 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Johntomaite= 94.45 barns/electron
U=PE_Johntomaite x rElectron Density= 360.65 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Johntomaite is Not Radioactive

Johntomaite Classification

Dana Class:

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

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

(41.09.01)Kulanite Group

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

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

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

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

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

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

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

Johntomaite

Ba(Fe++,Ca,Mn++)2Fe+++2(PO4)3(OH)3
Dana No: 41.09.01.05 Strunz No: 08.BH.20
Locality:

Notes: