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Johntomaite

Formula:
BaFe
2+
2
Fe
3+
2
[OH|PO
 
4
]
 
3
System:MonoclinicColour:Greenish black
Lustre:Sub-Adamantine, Vitreous, GreasyHardness:4½
Name:For John Toma (b. 1954) who discovered the mineral.


Bjarebyite Group.

Classification of Johntomaite

IMA status:Approved 1999
Strunz 8th edition ID:7/B.29-35
Nickel-Strunz 10th (pending) edition ID:8.BH.20

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
H : With medium-sized and large cations, (OH,etc.):RO4 = 1:1
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Type Occurrence of Johntomaite

Type Locality:Spring Creek Mine, Wilmington, South Flinders Ranges, Flinders Ranges, South Australia, Australia
General Appearance of Type Material:clusters of greenish black monoclinic prisms 0.3 to 1 mm in length.
Place of Conservation of Type Material:South Australian Museum, Adelaide, South Australia, Australia
Geological Setting of type material:found on dumps of the Spring Creek copper mine

Physical Properties of Johntomaite

Lustre:Sub-Adamantine, Vitreous, Greasy
Diaphaneity (Transparency):Opaque
Colour:Greenish black
Streak:Dark grey greenish
Hardness (Mohs):4½
Hardness Data:Measured
Density (measured):4.05 g/cm3
Density (calculated):4.084 g/cm3

Crystallography of Johntomaite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/m {P1 1 21/m} {P21/m} {P1 21/m 1}
Cell Parameters:a = 9.199Å, b = 12.359Å, c = 5.004Å
Ratio:a:b:c = 0.744 : 1 : 0.405
Unit Cell Volume:V 559.9 ų
Z:2
X-Ray Powder Diffraction:
d-spacingIntensity
3.159 (100)
2.983 (50)
2.749 (50 broad)
4.573 940)(
3.091 (40)

Optical Data of Johntomaite

Type:Biaxial (-)
RI values: nα = 1.817 nβ = 1.829 nγ = 1.837
2V:Measured: 80° to 85°, Calculated: 78°
Maximum Birefringence:δ = 0.020

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Pleochroism:Strong
Comments:X = bluish green
Y = dark brownish green
Z = brownish

Z=b

Chemical Properties of Johntomaite

Formula:
BaFe
2+
2
Fe
3+
2
[OH|PO
 
4
]
 
3
Essential elements:Ba, Fe, H, O, P
All elements listed in formula:Ba, Fe, H, O, P

Relationship of Johntomaite to other Species

Member of Group:
Bjarebyite Group:
Related Minerals - Nickel-Strunz Grouping):

- +
8.BH.05Thadeuite
Ca(Mg,Fe
2+
 
)
 
3
[(OH,F)|PO
 
4
]
 
2
8.BH.10Durangite
NaAl[F|AsO
 
4
]
8.BH.10Isokite
CaMg[F|PO
 
4
]
8.BH.10Lacroixite
NaAl[F|PO
 
4
]
8.BH.10Maxwellite
NaFe
3+
 
[F|AsO
 
4
]
8.BH.10Panasqueiraite
CaMg[(OH,F)|PO
 
4
]
8.BH.10Tilasite
CaMg[F|AsO
 
4
]
8.BH.15Drugmanite
Pb(Fe
3+
 
,Al)
 
2
[OH|PO
 
4
]
 
2
8.BH.20Bjarebyite
(Ba,Sr)(Mn
2+
 
,Fe
2+
 
,Mg)
 
2
Al
 
2
[OH|PO
 
4
]
 
3
8.BH.20Cirrolite
near Ca
 
3
Al
 
2
(PO
 
4
)
 
3
(OH)
 
3
8.BH.20Kulanite
Ba(Fe
2+
 
,Mn
2+
 
,Mg)
 
2
(Al,Fe
3+
 
)
 
2
[OH|PO
 
4
]
 
3
8.BH.20Penikisite
Ba(Mg,Fe
2+
 
,Ca)
 
2
Al
 
2
[OH|PO
 
4
]
 
3
8.BH.20Perloffite
Ba(Mn
2+
 
,Fe
2+
 
)
 
2
Fe
3+
2
[OH|PO
 
4
]
 
3
8.BH.25Bertossaite
(Li,Na)
 
2
(Ca,Fe
2+
 
,Mn
2+
 
)Al
 
4
[(OH,F)|PO
 
4
]
 
4
8.BH.25Palermoite
(Li,Na)
 
2
(Sr,Ca)Al
 
4
[PO
 
4
]
 
4
(OH)
 
4
8.BH.30Carminite
PbFe
3+
2
[OH|AsO
 
4
]
 
2
8.BH.30Sewardite
CaFe
3+
2
(AsO
 
4
)
 
2
(OH)
 
2
8.BH.35Adelite
CaMg[AsO
 
4
](OH)
8.BH.35Arsendescloizite
PbZn[OH|AsO
 
4
]
8.BH.35Austinite
CaZn[OH|AsO
 
4
]
8.BH.35Cobaltaustinite
CaCo[OH|AsO
 
4
]
8.BH.35Conichalcite
CaCu[OH|AsO
 
4
]
8.BH.35Duftite
PbCu[OH|AsO
 
4
]
8.BH.35Gabrielsonite
PbFe[OH|AsO
 
4
]
8.BH.35Nickelaustinite
Ca(Ni,Zn)[OH|AsO
 
4
]
8.BH.35Tangeite
CaCu[OH|VO
 
4
]
8.BH.35Gottlobite
CaMg[OH|(VO
 
4
,AsO
 
4
)]
8.BH.40Čechite
Pb(Fe
2+
 
,Mn
2+
 
)[OH|VO
 
4
]
8.BH.40Descloizite
Pb(Zn,Cu)[OH|VO
 
4
]
8.BH.40Mottramite
Pb(Cu,Zn)[OH|VO
 
4
]
8.BH.40Pyrobelonite
PbMn
2+
 
[OH|VO
 
4
]
8.BH.45Bayldonite
Cu
 
3
Pb[OH|AsO
 
4
]
 
2
8.BH.45Vésigniéite
BaCu
 
3
[OH|VO
 
4
]
 
2
8.BH.50Paganoite
NiBi[O|AsO
 
4
]
8.BH.55Jagowerite
BaAl
 
2
[OH|PO
 
4
]
 
2
8.BH.60Attakolite
(Ca,Sr)Mn(Al,Fe)
 
4
[(OH)
 
4
|(SiO
 
4
,PO
 
4
)|(HPO
 
4
,PO
 
4
)
 
3
]
8.BH.65Leningradite
PbCu
 
3
[Cl|VO
 
4
]
 
2

Other Names for Johntomaite

Synonyms:
IMA1999-009Tomaite
Other Languages:
German:Johntomait
Russian:Джонтомаит
Spanish:Johntomaita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Johntomaite

Reference List:U.Kolitsch, A. Pring & E.R.T. Tiekink: (2000): "Johntomaite, a new member of the bjarbyite group of barium phosphates: description and structure refinement" :Mineralogy and Petrology : 70: 1-14.

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    Localities for Johntomaite

    Hide Locality List
    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Australia
     
    • South Australia
      • Flinders Ranges
        • South Flinders Ranges
          • Wilmington
    		Min. Petrol. (2000): 70, 1-14.
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